sand, slightly curved, slightly narrower posteriorly, with flat ventral surface; 

 cases made entirely or partly of detritus usually with a thin long I'od, a stalk 

 or a conifer needle which projects posteriorly (Figui-e 533). 



Pupa. Length 11 — 14 mm, rarely 15— 16mm. Antennae filiform, thin, 

 reaching abdominal segment 7—8, proximal segment slightly thickei- than 

 the others. Labrum brownish, its anterior margin forming a broad, rounded 

 process flanked by small, thin seta 1; five long, black, hooked setae on light 

 background. Anteclypeus with 3 setae, 2 of them black, moderately long, 

 lateral seta yellowish, short, slightly curved. Median blade of mandible 

 straight, serrated, with a tubercle basally; dorsal lateral, seta larger than 

 ventral. 



Wing sheaths rounded postei'iorly, i-eaching end of segment 3 or beginning 

 of segment 4. Mid-tarsi with dense natatorial setae on segments 1—4; setae 

 304 on segments 1—2 of mid-tarsi sparse; short, and few on segment 3; 

 segment 4 with a few setae on one side only. 



FIGUE^S 531-533. Chaetopteryx villosa Fabr,: 



531 - right trochanter and femur of foreleg (A), midleg (B), and hind leg (C), 

 posterior; 532 - tergite of segment 9 and left anal leg, dorsal; 533 - larva 

 in case (532 and 533 - after Hickin). 



Dorsal process of abdominal segment 1 small; lobes of saddle- shaped 

 indentation of posterior margin with small spinules directed posteriorly. 

 Holding apparatus on segments 3—7; number of hooks: 111:3—4; IV:4— 5; 

 V:3-5 + 10-14; Vl:3-4; VlI:2-3. Lateral line on segments 5-8, with dense, 

 grayish black setae. Gills as in larva: pleural row present only in anterior 

 half of abdomen, dorsal row mainly anteriorly; segments 5—6 with small. 



382 



