Scattered records across north and central Europe from Finland to Italy (Pollet 2013), although the discovery of the closely related M. similis Brooks & Ulrich, 2012 casts some doubt on old distribution data for M. praecox (Brooks and Ulrich 2012). The presence of M. praecox in Finland was considered doubtful by Kahanpää and Winqvist (2005). This new record confirms the presence of this species in Finland.

Hydrophorus wahlbergi var.(?) callosoma Frey 1915: 65 stat. rev.

Hydrophorus albosignatus Ringdahl 1919: 16 syn. nov.

Hydrophorus callosoma is externally most like H. altivagus Aldrich, 1911 (=H. wahlgreni Frey, 1915). Both sexes can be identified by the armature on fore femora: there is only a single short row of 6-13 small ventral spines in the basal third of the fore femur. Anteroventral spines missing or at most 1-3 very short ones present (usually completely absent in females). H. altivagus has a row of strong anteroventral spines reaching the apical third of the femur in addition to the ventral spines. Other differences between the two species are tabulated in Table 1.

Sweden, Finland and North-Western Russia (Murmansk and Archangelsk Oblasts).

Richard Frey described Hydrophorus callosoma as a variety of on the basis of two female specimens. He did, however, express doubt about it's true status. The name has later been synonymed with H. wahlberg Frey, 1915 (Negrobov 1977), which in turn was synonymised with H. altivagus Aldrich, 1911 (Hurley 1985).

The type material of H. callosoma Frey consists of two females deposited in MZH. The lectotype (here designated), a female from Kantalaks (=Kandalaksha, Russia), is identical with H. albosignatus Ringdahl, 1919 (Figs 1c, 2c, 3c). Frey's second type specimen from Kem belongs to H. altivagus.

a

b

c

d

e

Figure 1.

Hydrophorus specimens, lateral view. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.

a: Hydrophorus callosoma Frey, male  
b: Hydrophorus altivagus Aldrich, male  
c: Hydrophorus callosoma Frey, female (lectotype of H. callosoma Frey)  
d: Hydrophorus altivagus Aldrich, female  
e: Hydrophorus callosoma Frey, female (paralectotype of H. albosignatus Ringdahl)  

a

b

c

d

e

Figure 2.

Hydrophorus specimens, dorsal view. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.

a: Hydrophorus callosoma male  
b: Hydrophorus altivagus male  
c: Hydrophorus callosoma female (lectotype of H. callosoma Frey)  
d: Hydrophorus altivagus female  
e: Hydrophorus callosoma female (paralectotype of H. albosignatus Ringdahl)  

a

b

c

d

e

Figure 3.

Hydrophorus specimens, face and fore femora. Left column: H. callosoma Frey. Right column: H. altivagus Aldrich.

a: H. callosoma male  
b: H. altivagus male  
c: H. callosoma female (lectotype of H. callosoma Frey)  
d: H. altivagus female  
e: H. callosoma female (paralectotype of H. albosignatus Ringdahl)  

Frey's H. callosoma type material was compared with a single female paralectotype of H. albosignatus Ringdahl, 1919 (see Figs 1e, 2e, 3e). It does match the Kantalaks specimen and the description of the male provided by Ringdahl, plus all available figures of the two species, clearly indicate that H. albosignatus Ringdahl is identical with H. callosoma of Frey.

The Kantalaks specimen is here designated as the lectotype of H. callosoma Frey, 1915. This choice is made because only this specimen does actually match Frey's original description "...near the previous species [=H. wahlbergi], from which is differs by its much more brilliant coloration and the pale hairs on the sides of the abdomen" (Frey 1915). The Kem specimen—like all specimens of both species—have pale hairs on the ventral margin of the tergites only. Because of the distortion of the abdomen of this dry-pinned female, the ventral hairs are visible when viewed from above.

H. callosoma Frey, 1915 is thus a senior synonym of H. albosignatus Ringdahl, 1919 and becomes the valid name for this species (syn. nov.).

New to Finland. Global distribution poorly known due to confusion with M. muralis (Fallén, 1823) (Pollet 2013).

Medetera belgica was based on a single female Parent 1936. Negrobov and Stackelberg 1972 redescribed the species based on male specimens from the Kola Peninsula in Russia, some 2,500 km away, without studying the holotype of M. belgica. It is certainly possible that the Finnish specimens identified as M. belgica sensu Negrobov are not conspecific with Parent's original types. M. belgica was synonymised with M. muralis by Grichanov (2002), but this synonymy has been disputed (Pollet 2013). In Finnish material the leg colour characters and differences in male genitalia between the two species (M. muralis and M. belgica sensu Negrobov) are well defined and constant.

New to Finland. Previously known from Estonia and Russia (Negrobov 1991, Grichanov 2002b).

New to Finland. Previously known from Russia (Archangelsk Oblast) and Estonia (Negrobov 1991, Grichanov 2002b).

New to Finland. Previously reported from Norway, Belgium, Switzerland, France, south Russia (Negrobov 1991, Naglis 2009, Pollet 2013), but this taxon might involve a group of closely related species.

New to Finland. Previously known from Russia, Estonia, Lithuania and Norway (Negrobov 1991, Jonassen 1998, Grichanov 2002, Pakalniškis et al. 2006).

New to Finland. A rare species previously known from Sweden and Alaska (Ringdahl 1920, Pollet 2013).

= Dolichopus cilifemoratus Macquart, 1827

= Dolichopus pseudocilifemoratus Stackelberg, 1930

New to Finland. Widespread in Europe, but many records should be confirmed due to the frequent misuse of this name for Dolichopus trivialis Haliday, 1832 (Pollet 2013).

This name has a confused history of use, which can be traced back to von Stackelberg (1930), who erroneously synonymised Macquart's cilifemoratus with the species now called D. trivialis Haliday, 1832. He then created a new name, pseudocilifemoratus Stackelberg, 1930. Subsequent authors have often repeated Stackelberg's mistake. This record represents the first time the genuine D. cilifemoratus of Macquart is found in Finland.

New to (present-day) Finland. Previously recorded as Finnish based on specimens from areas ceded to Russia after the second world war (Kahanpää and Grichanov 2004). Also reported from Sweden, northern Russia, Mongolia and (doubtfully) in the Oriental region (Frey 1915, Grichanov 2002, Pollet 2013).

A species of eutrophic calcareous spring-fed fens in northern Finland.

New to Finland. Also known from Sweden, Norway and Asian Russia (Hedström 1966, Grichanov 2006, Negrobov et al. 2010, Pollet 2013).

New to Finland. Widespread in Europe north of the Alps (Pollet 2013).

New to Finland. Widespread in Europe, also known from the Near East (Pollet 2013).

New to Finland. An east European species, previously recorded from Austria, Hungary, European Russia and Ukraine (Pollet 2013).

Caught on the silt banks of a small stream in a herb-rich forest.

New to Finland. Widespread in Europe reaching the Near East and Siberia (Pollet 2013).

New to Finland. Widespread in Europe, reaching the Middle East (Pollet 2013).

New to Finland. Previously known from Sweden and Russian East Siberia (Negrobov 1991, Ringdahl 1949).

C. femoratus is common and occasionally abundant along forest streams in the central boreal zone of Finland. Its rarity in museum collections is explained by the combination of a northern distribution, an early/late occurrence of the adults and a species-poor habitat often skipped by collectors of Dolichopodidae: the adults are on the wing in May and September when these forests may still have a partial snow cover.

New to Finland. Previously known from NW Russia, Germany and Spain (Bellstedt et al. 1999, Carles-Tolrá Hjort-Andersen 2002, Kahanpää and Winqvist 2005). As the European Micromorphus are in need of revision, the distribution of most species is poorly known.

Identified using Negrobov (2000).