Wing sheaths of female pupae reaching abdominal segment 6; those of 

 male pupae, abdominal segments 7—8. Tibiae and tarsi of midlegs of 

 female pupae broad, first 4 segments of mid-tarsi of male and female pupae 

 with a few light brown setae. 



Holding apparatus complex; presegmental plates present on abdominal 

 segments 2—8; postsegmental plates on segments 2—6. Spinules on pre- 

 segmental plates on segments 2—5 and 8 forming a regular arc or rows; 

 the spinules on segment 6 are more numerous and situated not only on 

 the plate but also anterior to it; segment 7 with only 6—8 spinules. 

 Spinules on postsegmental plates small and numerous, forming several rows; 

 they are situated on segment 5 anterior to a narrow transverse plate; 

 they are situated laterally near the posterior margin on segments 2—4 and 6. 



Distal lobes of last segment rounded at the end (Figure 582) longer in 

 male pupae; sheath of penis and outer appendages near base of lobes in 

 male pupae. 



Pupa lying in a cocoon of loose tissue in a case with rough, thick walls 

 covered with fine and coarse sand grains; ventral side flat and with a broad 

 longitudinal slit; a filtering sieve at each end of the case (Figure 583); 

 Length of case 5— 6 mm; case usually situated on stones. 

 412 Mode of life and habitats. The larvae live in tubular tunnels; 



they are detritophagous and occur in rivers and rivulets, sometimes in lakes. 



Distribution. The European USSR, except the southeast. In addition, 

 Europe. 



2. Psychomyia shelkovnikovi Marty no v 

 Fridman, 1950:48-50, Figure 2, 1-8. 



Full-grown larva. The larva resembles that of the closely related 

 P. pus ilia; length 7.0— 8.5 mm. Head markedly longer than broad. Ground 

 color yellow; pattern distinct, grayish brown, dark brown in some places;* 

 surface shagreened and ornamented. Processes of anterior margin of 

 frontoclypeus more projecting than in P. pus ilia, markedly smaller than 

 the median depression (Figure 584); anterior part of sclerite posterior to 

 the median depression, dark in the middle. Posterior part of sclerite 

 completely dark; it appears as an irregular triangular grayish brown spot 

 on the light background; its anterior margin convex and with a transverse 

 row of 3 light indistinct dots. Coronal suture with a narrow brown stripe. 

 Distal stripes indistinct, forming grayish shades, more distinct near the 

 anterior margin. Occipital foramen with a narrow brown margin. 



Head darker ventrally than dorsally; gular suture with a narrow dark 

 stripe; wide smoke brown spots with indistinct light dots laterally and 

 posteriorly; dark brown anterior margin narrower ventrally than in 

 P. pus ilia, with 2 large club-shaped processes. Gula small, triangular, 

 slightly larger than in P. pusilla, without thickened dark brown anterior 

 margin; anterior angles pointed but not as narrow and long as in P. pusilla; 

 gula shagreened and ornamented. Setae of head as in P. pusilla; a light 

 spot at the base of seta 18. 



Dorsal sclerite of labrum darker than in P. pusilla, dark smoke brown; 

 setae similar; setae 3 slightly longer. Mandibles similar; left mandible 



* A very light variety without pattern occurs at the boundary of the range (Psekups River). 



463 



