FIGURE 783. Triaenodes sp., larva nova: Pronotum (A) and mesonotum (B) 



Tergite of segment 9 light brown, with concave anterior margin; setae 

 as in T. bicolor. Anal legs similar; sclerite "b" white, with an 

 indistinct, brownish, basal dot dorsally; setae and claw as in T. bicolor. 



Case straight, tapering posteriorly made of small pieces arranged in a 

 spiral, slightly coarser than in T. bicolor. 



This larva may be that of T. interna McL., according to its 

 distribution. 



Localities. 1) Ob' near Novosibirsk, 10 June 1925, canal between 

 Bugrinskii Island and the left bank, 2 specimens collected by S.G. Lepneva; 

 2) Astrakhan Nature Reserve, 2 May 1954, No. 15, 1 specimen, collected 

 by A. A.Kossova; 3) Urals, Lake Berendysh, 15 July 1929, collected by 

 N. N. Lipina. 



5. Genus Erotesis McLachlan 



Full-grown larva. Length 8.0— 8. 5 mm. Head mainly dark; sensilla of 

 antenna very long; gula rectangular. Pronotum and metanotum sclerotizec 

 Hind tibia divided. Gills absent. Tergite of segment 9 present; anal legs 

 moderately long, as in Triaenodes. Case straight, made of fine plant 

 particles. 



Mode of life and habitats. Small bodies of stagnant water. 



Distribution. Western and northwestern parts of European USSR. 

 In addition, Europe. 



1. Erotesis baltica McLachlan 



Siltala, 1905:77— 79, Figure 20.- 

 Lestage, 1921:631— 634, Figure 218. 



Ulmer, 1909:250, 310, Figure 377, 

 - Lepneva, 1940:210. 



489 



P\ill -grown larva. Length 8.0— 8.5 mm. Head oblong, dark; sensilla of 

 antenna very large, longer and thicker than in T. bicolor, slightly 

 thicker apically (Figure 784, A, C); seta relatively large. Ground color of 

 head brownish yellow in periocular area; greater part of head chestnut 



611 



