Mode of life and habitats. Brooks and rivulets with cool water, 

 on stones. 



Distribution. USSR: west of the European part. In addition, 

 southern, Central and northern Europe. 



2. Subfamily AGAPE TINAE Martynov 



Full-grown larva. Length 4.5— 6.2 mm. Head short and broad. Fronto- 

 clypeus large, with rounded lateral notches in the anterior third; gula fused 

 with pregula outside the head capsule. Antennae, as in Glossosomatinae, 

 situated anterior to the eyes, with 2 sensillae and 2 setae, median seta longer 

 than outer seta. 



Mandibles with a distinct transverse groove, spatulate, without teeth; 

 median chetoids on- left mandible simple and feathered; those of right 

 mandible feathered and fewer in number than in the Glossosomatinae; outer 

 setae at base of mandible situated close together; ventroposterior seta 

 small and thin; dorsal seta long and dark. Submentum divided. 



Prothorax with convex dorsal surface and short ventral surface; there- 

 fore, mouth of the larva directed obliquely downward, as in Glossosomatinae. 

 Secondary setae of pronotum numerous, unlike in Glossosomatinae. 

 Tergites present on meso- and metathorax. Pleural sclerites and 

 prosternum as in Glossosomatinae; mesosternum not divided. Legs thin 

 and narrow, little differentiated; basal spinule of claw small, situated basal to 

 the seta. 



Abdomen, dorsal sclerite of segment 9, and anal legs as in Glossosoma- 

 tinae. Claw small, strong, with a small dorsal claw and 7 setae; seta 5 

 absent. 



The larvae live in cases with a flat ventral side and a convex dorsal side; 

 anterior and posterior ends of case similar; the ends of the case are 

 elongated in form of tubes before the openings. 



Pupa. Length 3—5 mm. Antennae reaching end of abdominal segment 5; 

 first antennal segment with 1 seta. Labrum with straight anterior margin 

 309 and rounded lateral margins; median seta small. Mandibles symmetrical, 

 serrate in the middle; basal seta small. Wing sheaths pointed; natatorial 

 setae present on 1st to 4th tarsal segments of the midlegs. Cocoon trans- 

 parent; case shieldlike, 4—8 mm long. 



Mode of life and habitats. Springs, brooks, rivulets and rivers 

 with cool water. 



Distribution. USSR: European and Asian parts, mainly in mountain 

 regions, e. g., Crimea, Caucasus, mountains of Middle Asia, Altai, the Sayans, 

 Far East. In addition, Europe, Asia, partly Africa, North and Central 

 America, Australia (isolated species). 



3. Genus Agapetus Curtis 



The only genus of the subfamily in the USSR for which the development 



is known.* 



" The second genus Eoagapetus Mart, is represented in the USSR only by E. praeteritus Mart., larvae 

 and pupae of which are unknown. 



336 



