2. Subfamily MACRONEMATINAE Ulmer 



Full-grown larva. Larvae have a different form from those of 

 Hydropsychinae. Head broad, markedly flattened, with a characteristic 

 chaetotaxy of different form. 



Lab rum oblong, with a more complicated chaetotaxy than in Hydro- 

 psychinae. Mandibles massive, sometimes long; left mandible without 

 brush. Submentum of different form, with lobes at the anterior margin. 



Median black spot at posterior margin of mesonotum small, sometimes 

 mushroom- shaped or dot-shaped; median spot of posterior margin of 

 metanotum in the form of a dot or absent. Trochantin of prothorax without 

 basal horn-shaped process, conical or spear-shaped. Basal seta of claw 

 of legs (with rare exceptions) in form of a short, thick, blunt spine; 2 or 

 several small spinelike processes near seta. Ventral sclerites of segment 8 

 absent, ventral sclerites of segment 9 small and oblong. 



Fan -shaped apical tuft on anal legs absent, replaced by 2 or 3 setae. 



Pupa. Antennae long, coiled around posterior end of body. Anal legs 

 narrow at the end, sometimes pointed. Pupae living in long tubular, jug- 

 shaped cases attached at anterior end of substrate. They sometimes occur 

 in large numbers, forming a crust, closely contiguous with their lateral walls. 



Mode of life and habitats. Large rivers in the plains; larvae 

 known from the Ob, Irtysh, lower reaches of the Biya, Yenisei, Angara, Stony 

 Tunguska, Amur, Ussuri and their tributaries. 



Distribution. Southern part of the USSR and Eastern Siberia, 

 Amur Region, Maritime Territory. In addition, Asia, Africa, South, Central, 

 North America, Australia, mainly in the tropics and subtropics. 



Key to Genera 

 Full-grown larva 



1 (4). Head flattened dorsally, with a horseshoe -shaped ridge. Blades of 



mandibles with basal and apical teeth. Process of trochantin of 

 prothorax conical. A conical process near base of fore coxae. 

 Metanotum with a small spot in middle of posterior margin. 



2 (3). Larvae large (20— 22 mm); head broad and short; dorsal ridge 



sharply marked, with a crown of secondary setae; submentum 

 trapezoidal 3. Macronema Pict. (p. 592) 



3 (2). Larvae much smaller (12 — 14 mm); head less broad; dorsal ridge 



without crown of setae; submentum triangular 



4. Amphipsyche McL. (p. 604) 



4 (l). Head moderately long, not flattened dorsally, without ridge or 



secondary setae. Mandibles long; teeth of mandibles present only 

 apically. Process of trochantin of prothorax spear-shaped. Fore 

 coxa without basal process; metanotum without posterior median 

 black spot 5. Aethaloptera Br. (p. 617) 



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