AQUATIC INSECTS IX XEW YORK STATE 359 



specimens has two longitudiual rows of small spots which are 

 not covered b}' 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, fig.15]. 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. cinereum Bellardi 

 Saggio di ditterologia Messiana. 1859. 1:13 



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

 Thorax fuscous and gray pollinose, 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. decorum Walker 

 List of Diptera. Brit. Mus. 1S4S. p.ll2 



Citwreiim, argenteo niicans, antennis piceis, pedibus fulvis, f&mori- 

 hus tibiisque piceo fasciatis, tibiis posticis tarsisque posterioribus 

 hasi alhis, alls limpidis. 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 

 piceous 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,^ decorum is a sj-nonym of S. 

 vittatum Zett. 



lU. s. Dep't Agri;\ Bui. 10, n. s. 1898. 



