Distribution. USSR: the European part, including the Caucasus, 

 Middle Asia, Maritime Territory. In addition, Europe, North Africa, Western 

 and southern Asia, North America. 



Key to Species 

 Full-grown larva 



1 (2). Processes at anterior margin of frontoclypeus relatively broad, as 



broad as median depression; anterior-angle processes of small gula 

 long, narrow, very thin, blackish; submentum black or blackish brown 

 1. P. pusilla Fabr. (p. 456) 



2 (l). Processes at anterior margin of frontoclypeus narrower than median 



depression; anterior-angle processes of gula broader, without thin 

 ends; submentum chestnut brown . .2. P. shelkovnikovi Mart. (p. 463) 



1. Psychomyia pusilla Fabricius 



Siltala, 1903b:18-21;Figure 3.- Ulmer, 1903:148; 1909:232, 298,299, 

 Figure 35 7, a, c; 436.- Lestage, 1921 :527-530, Figure 176.— Lepneva, 

 1940:203; 1956:10, 12, Figures 1, 7, 31, 34. - Brindle, 1960c:265-267, 

 Figures 1—9. 



Full-grown larva. Length 7.5— 8.0 mm; sclerites yellow; pattern 

 delicate, light brown or absent, except at the dark margin of the sclerites. 

 Head (Figure 575) moderately broad, dorsal side almost as long as wide; 

 ventral side much shorter than wide; sclerites shagreened. Eyes small. 

 Anterior margin of frontoclypeus thickened (Figure 576), with two blackish 

 brown processes lateral to the shallow median indentation; a trapezoidal 

 smoke brown spot, posterior to the indentation; posterior part of sclerite 

 brown or yellowish brown, lighter in the middle, with 3 large, indistinct, 

 transverse elliptical, light dots. Pattern on dorsal surface absent in light 

 specimens and the whole head, except the anterior and posterior margins, 

 uniformly yellow. Anterior-margin setae yellowish, long, almost of the 

 same length, situated close together, at the angles of the sclerite. Anterior 

 frontal setae small, light, curved inward, displaced from the sutures, 

 situated posterior to the smoke brown spot; a pit between them in the 

 middle; middle frontal setae situated near the anterior setae, on the sides of 

 the sclerite, brownish yellow and long; posterior frontal setae also long 

 but not situated on light dots as in Tinodes but near them, near the suture; 

 a small reddish pit posterior to the setae. 



Head dorsally uniformly yellow or grayish yellow lateral to the epicranial 

 suture, slightly darker on the dorsal stripes than in the other part in some 

 specimens; a narrow dark stripe near the coronal suture; margin of 

 occipital foramen chestnut brown, darker laterally. The following setae 

 belong to the group of long brown setae, which are directed anteriorly and 

 upward: seta 7 situated close to the frontal suture, setae 9 and 14; a dash- 

 like fold runs from the base of seta 14 anteriorly around the inner side of 

 the eye; seta 12 situated lateral to the eye, almost as long as seta 14, 



456 



