FIGURE 422. Hydroptila 

 femoralis Eat. Labrum 

 of pupa (after Nielsen) 



is short, situated dorsally in the middle on a membrane near the margin; 



dorsal seta 2 situated near the transverse stripe,* as long as the median 



setae 3 and 4; the short, outer seta 5 is situated in the basal part; seta 6 



in the distal part is long but shorter than the three 



above setae; ventral setae 7 and 8 small and spinelike. 



Three caudal tracheal gills (Figure 420); the 

 median gill slightly longer than the lateral gills. 



The case of the full-grown larva is oval at the 

 beginning of construction, it is bean -shaped at the 

 end of construction; the larva enlarges the case, 

 adding first to its anterior, posterior and ventral 

 sides, and when the ventral wall is complete, to the 

 ends; the traces of the initial stage of construction 

 form therefore a small median hump on the dorsal 

 side of the complete case; the ends of the initial stage 

 of construction, which represent the end of 

 construction of the case are visible on the ventral 

 side (Figure 421 ). 



Pupa. Length of male pupa 2.4— 2.8 mm; length 

 of female pupa 2.8—3.2 mm. Antennae short, reaching 

 in female pupae the middle of the 1st abdominal 

 segment, in male pupae the middle or end of the 

 3rd segment. Labrum (Figure 422) with broadly 

 rounded anterior margin and curved sides; a pair of 

 short rudimentary setae near the anterior margin; 

 mediobasal setae rudimentary; lateral setae long and 

 curved. The anterior basal seta of the mandibles is 

 short, thin and slightly curved. Wing sheaths long, 

 pointed; they reach the end of the body in males and 

 females. Natatorial setae situated at the margin of 

 segments 1—3 of the mid-tarsi; they are dense, 

 48—60 in the upper row and 50—69 in the lower row; 

 the setae are longer at the beginning of the row and 

 shorter at its end. Presegmental plates of the 

 holding apparatus present on abdominal segments 3—7 

 as in Agraylea; they are large and pointed 

 posteriorly; postsegmental plates present on ab- 

 dominal segments 3—5, small and rounded; the 

 number of spinules is as follows: 111:5—12+ 8—13; 

 IV:7-11+ 9-13; V:8-15+7-16; VI:8-17; VII:11-14. 

 Posterior end of body of male pupa with a rounded process in dorsal view; 

 the processes of the developing lateral lobes of the male genitalia are 

 visible ventrally; penis visible in the middle. 



Length of pupal case (which is the closed larval case) 2.9—5.2 mm; the 

 attachment ligaments originate on the inner side of the walls, near the ventral 

 angles of the anterior and posterior slits; the plates of the ligaments are 

 of irregular form; the anterior closing membrane is situated 0.2— 0.4 mm 

 from the margin of the case, the posterior closing membrane 0.1 mm or less 

 from the margin. 



FIGURE 423. Hydroptila 

 sparsa Curt. Pupa in its 

 case (after Siltala) 



Nielsen (1948:75, Figure 25, C) incorrectly designates seta 2 as seta 6, and seta 6 as seta 2. 



370 



