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AQUATIC INSECTS IN NEW YORK STATE 365 
S. invenustum Walker 
List of Diptera. Brit. Mus. 1848 
Nigrum, cinereo subfuscum, abdomine basi fulvo hirto, antennis 
piceis, pedibus fulvis, alis limpidis. Fem.; Cinerewm, antennis 
nigris, pedibus rufo-cinereis, tarsis nigris. 
Body black, overspread with a grayish bloom; base of the 
abdomen clothed with tawny hairs; feelers piceous; legs tawny 
and clothed with tawny hairs; wings colorless; fore border 
veins brown; the other veins tawny and slender; poisers piceous. 
“Female. Body gray;.feelers black; legs reddish gray; feet black. 
Length of the body 3mm; of the wings 7mm. 
St Martin’s falls, Albany river, Hudson tay. Presented by 
Mr G. Barnston. This is said by Mr D. W. Coquillett to be 
the species which C. V. Riley called pecuarum. 
S. irritatum Lugger 
Minn. Agric. Exp. Sta. Bul. 48. 1896. p.204 
Figures are given of both male and female in the bulletin, 
but without description. Neither is its.life history given, though 
it was apparently known to Mr Lugger. Both the male and 
female are represented with an unstriped thorax, a fasciate 
abdomen, and bicolored legs. The male appears to have a 
light spot on the anterior margin of each segment of the ab- 
domen and a pair of spots on the anterior margin of the thorax. 
This species is said to be the most common black fly in the 
central part of Minnesota. 
It is to be hoped that this species may again be found and 
fully described in the near future. 
S. metallicum Bellardi 
Saggio, etc. 1859. 1:14 
Male. Metallic blue black. The base of the antennae, the 
halteres, the fore femora, the middle portions of the fore tibiae, 
the bases of the middle and hind tibiae, the bases of the first 
and second joints of the middle and hind tarsi, are white. 
Wings hyaline; its veins rather indistinct. Length of body 
2mm; extended wings 5mm. Mexico, 
S. meridionale Riley 
Dep’t Agric. An. Rep’t for 1886. 1887. p.512 (turkey gnat) 1891; §&. 
occidentale Townsend, Psyche, July 1891, p.107 (synonymy according 
to Coquillett). 
