46 DURHAM DIPTERA. 



V.69. 



Family V.— SIMULID.dE. 

 69. Simulium, Ltr. 

 Larvae live in running streams attached to stones or stems. 



TABLE OP SPECIES. 



Males. — Eyes touching. 



1 (6). Thorax distinctly silvered in front, which is not hidden 



by gold tomentum. 



2 (3). Silver edging very broad, and only narrowly broken 



in the middle. (395- ornatum, Mg.) 



3 (2). Silver edging moderately broad and widely broken in 



the middle. 



4 (5). Hind tibiae white only at the very base. Hind meta- 



tarsi all dark. Large species. 2-3 mm. 



refitans, L. (396) 



5 (4). Hind tibiae white to the middle, base of hind meta- 



tarsi white. Small species. 1-1^ mm. 



(399. nanum, Ztt.) 



6 (1). Thorax not silvered, or silvering hidden by gold 



tomentum. 



7 (8). Thorax with thick short golden hair in front. Large 



species. 2-3 mm. latiftes, Mg. (398) 



8 (7). Thorax with only scattered gold hairs here and there. 



Small species. 1-15 mm. (397. maculaium, Mg.) 



Females. — Eyes remote. 



1 (8). Brownish or grey species. 



2 (3). Thorax with three dark stripes, small species. 



(397. macula turn, Mg.) 



3 (2). Thorax unstriped. 



4 (5). Small species. 1^ mm. (399* nanum, Ztt.) 



5 (4). Large species. 2-2^ mm. 



6 (7). Base of the wing yellowish. Front edge of the thorax 



very distinctly whitish grey. (395* ornatum) 



7 (6). Base of the wing not yellowish. Front edge of the 



thorax only slightly whitish grey. 

 396. Simulium reptans, L. 

 This is the common species, and the only one that 



