Mode of life and habitats. Small cool rivulets and brooks, in 

 springs and in caves; on stones on solid bottom, on large pieces of trees. 



Distribution. European USSR: the Caucasus, the Crimea, Southern 

 Maritime Territory. In addition, Europe, North China, Iran, Pakistan, India, 

 Australia. 



Key to Species 

 Full-grown larva 



1 (2). Punctate figure in the middle of the frontoclypeus almost round; 



end of rows of dots close together anteriorly 



1. P. conspersa Curt. (p. 476) 



2 (l). Punctate figure in middle of frontoclypeus oblong; end of rows of 



dots widely separated anteriorly 2. P. latissima Mart. (p. 484) 



1. Plectrocnemia conspersa Curtis 



Pictet,* 1834:219, Plate XIX, Figure 1.- Klapalek, 1893:116, Figure 31.- 

 Struck, 1903:119, Plate IV, Figure 1.- Ulmer, 1903:1 19-120, Figures 45, 

 106,123; 1903c:348-349.- Siltala, 1903c:12, Figure 5; 1907:406, Figure 6, a, 

 b, c, e, f. - Ulmer, 1909:230, 297, Figure 355a.- Lestage, 1921:488, 

 Figure 157.- Nielsen, 1942:395-413, Figures 50-63.- Hickin, 1947:114-117, 

 Figures 1-11.- Satija, 1959c:158-l 68. 



Full-grown larva. Length 20—22 mm, width of head 2.4 mm; body slender, 

 ratio of width of body to length = 0.16; ratio of length of head, thorax and 

 abdomen - 10:19:44. Head brownish yellow; pattern brown, with large, 

 distinct dark dots (Figure 596, A). Eyes small, situated on a yellowish white 

 background; antennae situated near the margin, near the clypangulus, with 

 3 setae and a small sensilla. Frontoclypeus, as characteristic for Poly- 

 centropodinae, broad anteriorly, with deep lateral indentations and a dark 

 dot at the curvature; a small transverse light elliptical spot in the middle 

 of the sclerite, between the frontal sutures; 3 large oblique dots anterior to 

 the spot on both sides; a curved row of dark dots in the posterior part of 

 the sclerite; Median anterior -margin setae very small, curved inward; 

 intermediate seta situated near it, lateral seta displaced to the anterior 

 angle, and posterior frontal seta all relatively large; anterior and middle 

 frontal setae small. Dorsal and lateral stripes indistinct, with a few large 

 dots. Head, including gula, broadly dark in the middle of the ventral side 

 (Figure 596, C), light laterally; groups of coarse dark dots near the occipital 

 foramen. Seta 9 longer and thicker than the other setae; seta 7 also large; 

 seta 11 situated near seta 9, resembling the anterior frontal seta; setae 10 

 and 13 situated lateral to the eye, small, setuliform. Setae 12 and 14 situated 

 posterior to the eye, large, long, slightly shorter than seta 9; setae 15 and 16 

 situated behind each other on a dark transverse stripe between the dorsal 

 and lateral stripes, thin and small; anteriorly displaced seta 17 similar, 

 situated near the suture, slightly anterior to the posterior frontal seta. 



* As in Hydropsyche senex Pict. 



5724 476 



