have a thick cover of tree or reed particles about 2 cm large; its walls 

 often contain moUusk shells, sometimes sand grains, in addition to detritus; 

 anterior part is sometimes made of sand grains and posterior part of 

 detritus; whole case rarely made of sand grains before pupation. 



(181) 



296 



299 



^JM^ 



300 



298 



FIGURES 296-300. Limnophilus rhombicusL.: 



296 — tergite of abdominal segment 9; 297 — claw of left 

 anal leg, lateral; 298 — case; 299 - dorsal process of 

 abdominal segment 1 of pupa; 300 - sheath of penis and 

 genital appendages of male pupa (299,300 — after Siltala). 



181 



Pupa. Length 17— 20 mm. Antennae reaching abdominal segment 8 or 

 end of body. Anteclypeus and labrum divided by a deep groove; anteclypeus 

 with 3 setae, a small, light lateral seta, an intermediate, and a median seta, 

 both thick, black, former larger than latter. Labrum brownish, with 

 rounded anterior process; seta 1 small, light, situated lateral to process, 

 other 5 setae projecting upward, large, golden brown, hooked at end, of 

 about equal length, situated laterally on elevation near anterior margin. 



Mandibles dark brown, pointed, with slightly convex, serrated blade; 

 setae short, situated basally; dorsal seta black, much larger than brownish 

 ventral seta. 



Wing sheaths reaching middle or end of abdominal segment 5. Midlegs 

 natatorial; tarsal segments 1—4 with yellowish brown setae, shorter and 

 sparser than usual; segments 1—4 of hind tarsi with sparse setae. 



226 



