V. Family STENOPSYCHIDAE Martynov 



Full-grown larva. Large, 45—50 mm long. Sclerotized parts yellow or 

 yellowish brown, with a dark, distinct, punctate pattern; membranous parts 

 of live specimens greenish. 



Head oblong, narrow; prothorax as broad as head, much narrower than 

 the following thoracic segments. Antennae as in Philopotamidae, situated 

 near the margin of the gnathal opening. Eyes situated on a light background, 

 close to the anterior margin. Frontoclypeus long, as in Philopotamidae, with 

 projecting anterior part and a shallow lateral indentation; coronal suture 

 relatively longer than in Philopotamidae, more than half as long as the fronto- 

 clypeus (a third as long as this sclerite in Philopotamidae). Gular suture 

 long; gula small, triangular. Labrum short and broad; dorsal sclerite 

 wide, covering the whole labrum except a narrow membranous stripe at the 

 anterior margin which bears a dense brush of light, grayish hairs; median 

 indentation small, rounded, with small lateral tubercles anteriorly. 

 Mandibles strong and black, blackish brown in part, with apical teeth; left 

 mandible with a brush of setae in the median depression; outer setae 

 moderately long in the middle. Mentum large, with a rounded process in 

 the middle of the anterior margin. 



Pronotum with broad, black posterior margin and a large black spot at 

 the lateral margin; posterior angle of sclerite curved ventrally. Punctate 

 pattern distinct. Propleuron with a short conical process of the trochantin; 

 epimeron unusually large, extending to the median line on the ventral side. 

 Prothoracic sternite in form of a strong black median sclerite with wide, 

 long posterolateral plates. 



Mesothorax narrower anteriorly; longer than the metathorax; pleural 

 sclerites forming narrow black sclerites, which correspond to the pleural 

 groove (transverse plate) and the moderately long distal margin of epi- 

 sternum and epimeron (longitudinal plate). 



Legs of almost the same length; midlegs slightly longer than the other 

 legs. Coxae of forelegs without dorsal groove and distodorsal indentation, 

 with a more or less large basodorsal process. Coxae of midlegs and hind 

 legs with a shallow distodorsal indentation, without dorsal tubercles. Only 

 primary setae present. Claws of legs with a hooklike basal process; a 

 light primary seta at the apex of the process of the forelegs; such a seta 

 absent on the process of midlegs and hind legs. 



First five abdominal segments of about the same width; the abdomen 

 gradually tapers posteriorly; segment 9 narrow, cylindrical, without dorsal 

 sclerite. Tracheal gills absent; anus forming a transverse slit; five anal 

 gills. Anal legs relatively short; section "a" membranous; sclerite "b" 

 379 with large dark dots. Claw short, strong and curved at a right angle. 



Pupa. Length about 22— 25 mm. Antennae longer than body; 1st segment 

 with a brush of setae. Labrum with three setae laterally at the anterior 

 margin. Mandibles long, geniculate, with a straight, coarsely serrated 

 blade; outer setae short. Wing sheaths blunt, reaching middle of abdomen. 

 Natatorial setae present on segments 1—4 of mid-tarsi. Ventral 

 appendages of male genitalia long and curved; penis short and broad. 



Pupal case large and elliptical, to 30 mm long, made of small stones and 

 large sand grains, thick and strong; ventilation holes present between the 

 sand grains. 



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