longer than in P. p u s i 1 1 a, curved distally; tooth of upper blade and 3 teeth 

 of lower blade distinct; chetoids of penicillus similar; tooth of upper blade 

 of right mandible small; distal tooth of lower blade projecting, sometimes 

 with an indentation. 



FIGURES 584 and 585. Psychomyia shelkov nikovi Mart.: 

 584 — frontoclypeus; 585 — head, ventral, gula and submentum. 



413 Submentum (Figure 585) dark reddish brown, slightly longer and narrower 

 than in P. pus ilia; its shagreened sculpture less marked; anterior -angle 

 setae as in P. p u s i 1 1 a, light and strong. 



Pronotum pale yellow; its pattern darker and more distinct than in 

 P. pus ilia, reddish brown; curved stripes in each half of sclerite and 

 lateral dark spots with large indistinct dots; median stripe lateral to the 

 suture with two small light spots; dark brown spot at the lateral margin 

 small; ridge sharp and dark brown. Both anterior-angle setae dark brown, 

 strong; 4 small light setae between them; the median anterior-margin group 

 consists of 7 setae (sometimes 8 or 9); 2 setae between the median and 

 angular setae, marginal seta darker than the others; surface setae as in 

 P. pus ilia. Meso- and metathorax and their setae as in P. pus ilia. 



Differences between forelegs and the other legs more marked than in 

 P. pus ilia; tibiae and tarsi of midlegs and hind legs relatively shorter 

 than in P. pus ilia. 



Abdominal segments 1—8 and anal legs similar. Laterodorsal sclerite 

 of anal legs reddish brown dorsally, with 3 large light spots; whitish yellow 

 distally and near the lateral margin; 2 setae distally and dorsally; 3 dark 

 strong setae, which become shorter ventrally laterally. 



Mode of life and habitats. Rivers and rivulets with stony 

 bottom; on the stony coast of large lakes (Lake Sevan) in plant overgrowths. 



Distribution. USSR: the Caucasus and Ciscaucasia. In addition, 

 Iran.* 



* Schmid (1959:766-767) thinks that P. shelko vniko vi Mart, is synonymous with P. pusilla Fabr.; 

 he considers this species as very variable; the characteristic structure of submentum, gula and antero- 

 ventral part of the head (Figure 585) are distinct characters of P. she lko vni ko vi in our opinion. 



464 



