AQUATIC INSECTS IN NEW YORK STATE 365 



S. invemistum Walker 

 List of Diptera, Brit. Mns. 1848 



Nigrum, cinereo subfuscum, aMomine basi fulvo hirto, antermis 

 pioeis, pedibiis fulvis, alis Umpidis. Fem.; Cinereum, (mtmms 

 nigris, pedibus rufo-cinereis, tarsis nigris. 



Body black, overspread with a gravish 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 bay. Presented by 

 Mr G. Barnston. This is said by Mr D. W. Coquillett to be 

 the species which C. V. Eiley called p e c u a r u m . 



S. irritatum Lugger 

 Jlinn. Agi-ic. Exp. Sta.. Bui. 48. 1896. p.204 



Figures are given of both male and female in the bulletin, 

 bat 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; S. 

 occidentale Townsend, Psyche, July 1891, p. 107 (synonymy according 

 to Coquillett). 



