SIMULIUM REPTANS 



171 



9. 



10. 



11, 



12. 



Thorax reddish violet or reddish, often with dark stripes ; 



claws not serrated ; species of large size .... scut 1st riatum. 

 Thorax reddish brown ; tomentum clear frosty ; species of 



medium size ........... prtiinosum. 



Thorax orange coloured .......... 9 



Thorax red rubrithorax. 



Edges of the thorax, and anterior sides of fore tibiae white . perflavum. 

 Without any white ; thorax with delicate tomentum . . hebeticolor. 

 Thorax without mother-of-pearl markings in the middle . . . . 12 



Thorax with mother-of-pearl markings in the middle II 



Two anterior and submedian subtriangular spots 

 Mother-of-pearl-like longitudinal stripes 



incrustatum. 

 minusculum. 

 (amazonicum). 



Tomentum golden to red ; somewhat diffusely metallic or 



white ............. 13 



Tomentum in small whitish tufts orhitalc. 



13 The scale-like hairs of tomentum in groups or arranged in 



lines .............. 14 



The hairs not arranged in any order . . . . . . . . 16 



H. The thorax without any clear edging . . . . . . . . 15 



The edging very clear ; the legs very dark above . . Sllbnigrum. 



15. Scutellum dark 16 



Scutellum light brown often lighter subpallidum. 



16. Large thick-set species with a dark silvery shimmer ; from 



high altitudes distinctum. 



Medium-sized species with a dull shimmer ; from ravines, very 



aggressive pertinax. 



17. Halteres externally reddish brown 13 



Halteres golden, with five clear golden stripes on the thorax ; 



a medium-sized species auristriatum. 



18. Halteres not very darkly coloured 19 



Halteres of a deep reddish brown ; claws serrated ; medium 



sized species inf uscatum. 



19. Claws not serrated ; very small species .... exiguum. 

 Claws serrated ; somewhat large species .... paraguayense. 



Simulium reptans, L. Johannsen gives the following translation 

 of Schiner's description in Fauna Austriaca. 



Male. ' Velvet black, dorsum of the thorax with a silvery white margin, 

 ' spot-like on the humerus, broadly interrupted in front ; visible only 

 ' in certain lights. Pleura also with a whitish reflection ; abdomen 

 ' with silvery white spots on the second and on the last two segments, 

 ' wanting in rubbed specimens ; the posterior margin of the first segment 

 ' with long and dense brownish cilia. Head black, face greyish white ; 

 ' antennae and palpi brownish black, the former more slender than is 

 ' usual with the members of this genus, with whitish reflections on some 

 ' parts. Legs dark brown ; front coxae yellowish, fore tibiae silvery white 

 ' outwardly; middle tibiae yellow at the base, hind tibiae likewise, though 

 ' in less degree, light brown, with a whiti-sh reflection ;. metatarsi of the 



