AQUATIC INSECTS IN NEW YORK STATE 359 



specimens has two longitudinal rows of small spots which are 

 not covered by the yellow tomentum. This was particularly 

 noticeable in the fresh specimen, but, as drying caused shrink- 

 age of the abdomen, the spots are no longer so distinct. 



The fore tibiae are each provided with a single spur, the mid- 

 dle and hind ones each with a pair. The tarsal claws are each 

 provided with a large basal tooth or lobe [pl.38, flg.l5]. The 

 halteres are pale yellow. 



Cambridge Mass. and Los Angeles Cal. (Coquillett, 1898); Law- 

 rence Kan. and Battle Creek Mich. (Collected by Professor Al- 

 drich); Ithaca N. Y. 



S. einereum Bellardi 

 Saggio di ditterologia Messiana. 1859. 1:13 



Male and female. Gray, antennae black, first joint pale. 

 Thorax fuscous and gray poUinose, the humeri pale; pleura 

 light gray; scutellum pale at the tip; halteres- white. Abdomen 

 blackish. The front coxae pale, the middle and hind pair gray- 

 ish brown; the femora pale at the base, their tips black; tibiae 

 black, their middle section pale; front tarsi wholly black, the 

 middle and hind pair with the bases of first and second joints 

 pale. Wings hyaline. Length of body 3mm; with extended 

 wings 9mm. 



Mexico, California (Townsend, 1893). 



S. deconim Walker 

 List of Diptera. Brit. Mus. 1848. p.ll2 . 



Cinereum, argenteo mioans, antennis piceis, pedibus fulvis, femori- 

 hus tibiisque pioeo fasciatis, tibiis posticis tarsisque posterioribus 

 hasi albis, alis linipidis. Body gray, adorned with white milky 

 luster, specially on the sides of the chest and on the breast; 

 feelers piceous; legs tawny; thighs and shanks with irregular 

 jjiceous bands; feet piceous; fore thighs adorned with white 

 luster; hind shanks and four hinder feet white at the base; 

 wings colorless; fore border veins pale tawny; the other veins 

 still paler and very indistinct; poisers pale yellow. Length of 

 the body 2.5mm; of the wings 6.5mm. 



St Martin's falls, Albany river, Hudson bay. Presented by 

 Mr G. Barnston. 



According to Mr Coquillett,i decorum is a synonym of S. 

 vittatum Zett. 



1 TJ. S. Dep't Agiic. Bui. 10, n. s. 1898. 



