(498) 



757 



FIGURES 797 and 798. Adicella f i 1 i c o rn i s Pict. : 



797 - larva: general view (A), labrum (B), mandibles, dorsal (C); 798 - pupa: left mandible, ventral 

 (A), lateral process of first abdominal segment (B),anal rods (C) (797, A - after Lestage, others after 

 Morton). 



498 



Pronotum reddish brown; mesonotum wider than pronotum, with light, 

 indistinct tergite. 



Hind legs longer than midlegs, but less long than in other genera; hind 

 tibia undivided. 



First abdominal segment wider than others; dorsal process high, large; 

 plate with spines of lateral processes with a long, large, distinct black 

 sclerite at base. Gills single, thin. Lateral line with small, thin, light hairs 

 on segments 3—7; segment 8 with a row of dots. Claw of anal legs with a 

 dorsal denticle. 



Case conical, strongly curved, smooth, made of small sand grains in 

 the anterior part and of secretion in the posterior part, with thick walls, 

 8 — 10 mm long. 



Pupa. Body narrow, cylindrical. Antennae coiled around posterior end 

 of abdomen. Labrum with anterior median process. Mandibles (Figure 

 798, A) deeply concave laterally, with sharp, hooklike apex; blade coarsely 

 serrated; lateral setae short. Wing sheaths narrow, reaching posterior 

 margin of segment 6. Midlegs with sparse, natatorial setae. 



First abdominal segment with processes with spines at the posterior 

 angles, (Figure 798, B). Plates of holding apparatus on segments 3—7, 

 number of spinules: 111:3—4; IV:3— 4; V:3 + 10— 12; VI:2— 3; VII:2. Lateral 

 line on segments 3—8. Anal rods (Figure 798, C) long, thin, with small 

 spinules in posterior third; setae small, apical. 



Case as in larva. 



Mode of life and habitats. Springs and brooks, often among moss 

 in oozing springs. 



Distribution. USSR: not recorded, but possibly occurring in the 

 western part of the European USSR. In addition, Europe. 



623 



