96 



Colour commonly white with almost black head and sipho; the tracheal trunks 

 very wide and flattened. 



Systematical remarks. When I first found the species and tried to deter- 

 mine it, I felt quite sure that I had found Finlaga geniculata (Olivier) = C. late- 

 ralis Meigen ; and even now after having studied the whole literature with regard 

 to this and allied species I do not think that there can be any doubt upon that 

 point; I cannot find any real discrepancy between Meigens' description and the 

 Danish specimens. Theobald too supposes that he has found the species again; as 

 his description is not however in full accordance with my specimens, I have given 

 a new one. It will be seen that my specimens do not agree with Theobalds with 

 regard to the drawing of the thorax, but are in accordance with Meigens' descrip- 

 tion; further that there is some discrepancy in the description of the wing between 

 Theobald and me. 



In this connection it is however necessary to take into consideration two other 

 species Cule.v stictieus Meig. and C. ornatus (Hoffmanseg) Meigen. 



C. stictieus is similar to C. lateralis, but differs from it in having the white 

 lateral spots on the abdomen united in bands; the legs are brown, the hind tibia 

 with a white stripe on the outer side. The species was later adopted by Schiner 

 (II p. 629) by Ficalby (1896 p. 120) lastly by Schneider (1914 p. 41); this author 

 maintains, that stictica is a good species and states that it is to be found in the 

 neighbourhood of Bonn. On the other hand Theobald (1901 p. 80) refers the spe- 

 cies to C. nemorosus and so does Blanchard (1905. p. 393). Having got the speci- 

 mens with white bands from Jutland I am quite sure that stictieus really is a good 

 species, to which most probably O. nigrinus (Eckstein) may be referred. (See page 

 93) Eckstein (1918 p. 67) maintains that the specimens of C. lateralis Meigen belong 

 to ornata. This view I cannot adopt. 



C. ornatus (Hoffmgg.) Meigen has always been a very doubtful species, and it 

 is now very difficult to understand what the earlier authors really meant by this 

 species; the type-species does not exist anywhere any longer, In Staeger's collec- 

 tion at the Boyal Museum, Copenhagen, there are some species labelled as C. or- 

 natus Meig. A closer examination has shown that there cannot probably be any 

 doubt that what Staeger has determined as C. ornatus Meigen has really been 

 Finlaga geniculata Olivier, (= C. lateralis Meig.). In Theobald's translation Meigen 

 has described C. ornatus as follows: "Thorax whitish, with two black streaks; ab- 

 domen fuscous with basal white bands; legs blackish, with a white knee spot; pro- 

 boscis blackish-brown; antennas dark brown in the o* with brown hairs; palpi of 

 the o* blackish-brown, with long hairs and three whitish spots; thorax yellowish 

 white with two converging blackish stripes and two others further behind ; pleura? 

 blackish-brown, with white spots and marks. Abdomen blackish-brown with white 

 basal bands. Legs brown with the coxa? dull yellow; femora dark brown, knee 

 spots white, tibia? and tarsi dark brown. Wings with brown scales. Length 3 lines". 

 Theobald has never seen the species, but indicates that it resembles C. lateralis 



