7 (10). Abdomen straight or almost straight, with transverse folds on the 



middle segments; case made of secretion with algae or of minute 

 sand grains 



8 (9). Relatively large, 4.5— 5.5 mm; case oval, broader in the middle 



than at the ends, made of secretion with filamentous algae 



1. Agraylea Curt. (p. 352) 



9 (8). Smaller, 3.1—4.1 mm long; case bean-shaped, with slightly concave 



ventral side, made of secretion and fine sand grains, diatoms or silt 

 particles 2. Hydroptila Dalm. (p. 364) 



10 (7). Abdomen curved; segments without transverse folds; case made 



of secretion, without any additional material. 



11 (12). Midlegs and hind legs, moderately long, case jug-shaped 



3. Oxyethira Eat. (p. 373) 



12 (ll). Midlegs and hind legs very long, about as long as the body; case 



sac-shaped 4. Leiochiton Guin. (p. 388) 



Young larva 



1 (2). Tergites very dark, almost black 7. Stactobia McL. (p. 406) 



2 (l). Tergites different. 



3 (6). Abdomen and head of larva with setae which are longer than the 



legs. 



4 (5). Tracheal gills at the end of the body absent 



1. Agraylea Curt. (p. 352) 



5 (4). Three long tracheal gills at the end of the body 



2. Hydroptila Dalm. (p. 364) 



6 (3). Setae of head and abdominal segments shorter. 



7 (8). Anal legs with very long setae, longer than the body; tracheal gills 



absent 3. Oxyethira Eat. (p. 3 73) 



8 (7). Setae of anal legs not so long. 



9 (10). End of body with three tracheal gills 



5. Orthotrichia Eat. (p. 391 ) 



10 (9). End of body with one tracheal gill 6. Ithytrichia Eat. (p. 399) 



Pupa 



1 (4). Case made of secretion, with a thin covering of fine sand grains or 



diatoms. 



2 (3). Anterior margin of labrum uniformly rounded, with one pair of 



small, rudimentary setae; case bean-shaped, attached to the 



substrate at the narrow ventral margin 



2. Hydroptila Dalm. (p. 364^ 



3 (2). Anterior margin of labrum with rounded sides and a small process 



in the middle, and with two pairs of setae; case slightly dor so - 

 ventrally compressed, barrel-shaped; its ends prolonged in form 



of short tubes, with which it is attached to the substrate 



7. Stactobia McL. (p. 406) 



351 



