Full-grown larva. According to Kimmins (1943:96) the lateral notches 

 of the frontoclypeus have small denticles (Figure 358); mandibles 

 relatively short, broad at the base. Claw of legs with a blunt basal process 

 and with a light, apical seta (Figure 359). In Kimmins' drawing, the claw 

 of the anal legs has only one spinule, unlike the 3 ventral spinules in 

 M. altaica (Figure 360). 



Larval case built of coarse sand grains and small stones. 



Pupa. The general habitus of the male pupa is given in Figure 361, 

 the end of the body of the female pupa in Figure 364. Labrum and 

 mandibles of the pupa (Figures 362, 363) resemble those of M y s t r o pho r a 

 altaica; the number of sclerites of the holding apparatus are the same. 

 Wing sheaths of male reaching end of abdominal segment 4. Pupal cocoon 

 reddish brown; case built of sand grains and small stones. 



Mode of life and habitats. Brooks. 



Distribution. Northern part of the European USSR, Kamchatka. 

 In addition, northern and Central Europe. 



306 2. Genus Glossosoma Curtis 



Full-grown larva. Length 8— 9 mm. Sclerites brown or yellowish brown; 

 dots on sclerites usually more or less distinct, distinct in preparations or in 

 light forms. Periocular area wide and light. Frontoclypeus large and 

 broad; posterior part larger than anterior part, anterior angles projecting; 

 mandibles slightly elongate, without teeth. 



Mode of life and habitats. Rapid brooks and rivulets with cool 

 water; on stones. 



Distribution. USSR: north, northwest and west of the European 

 USSR, Caucasus, mountainous parts of Middle Asia. In addition, Europe, 

 Asia, North and Central America. 



Key to Species 

 Full-grown larva 



1 (2). Sclerites dark brown, with indistinct dashes and dots; Caucasus . . 



1. Glossosoma unguiculatum Mart. * (p. 333) 



2 (l). Sclerites yellowish brown; dashes and dots on sclerites more 



distinct; north of the European USSR 



2. Glossosoma vernale Pict. (p. 335) 



1. Glossosoma unguiculatum Martynov, larva nova 



Full-grown larva. Length 6.5— 7.2 mm. Head chestnut brown dorsally, 

 lighter ventrally and near the occipital foramen, with distinct dots; eyes 

 situated on a large light yellow area with a posterior and lateral light 



* The identification should be checked by examination of a full-grown pupa to avoid confusion with the closely 

 related species Glossosoma capitatum Mart. 



333 



