AQUATIC INSECTS IN NEW YORK STATE 361 
cording to Mr Coquillett the species also occurs in Colorado and 
Montana [pl.38, fig.21]. 
Moscow Id. (June 19). 
S. glaucum Coquillett 
U.S. Nat. Mus. Proc. 1902: - 25:97 
Male. Head and body black, face gray pruinose, thorax bluish 
gray pruinose, mesonotum marked with a narrow median and 
_ slightly wider lateral black vittae, broad lateral margins, when 
viewed from behind silvery white, a pair of large subquadrate 
spots on the front end separated by the median black vitta, 
which is here greatly dilated; abdomen velvet black, sides of 
segments two and five to nine silvery, middle of dorsum of four 
also silvery; venter almost wholly silvery; femora and tibiae 
brown, bases of tibiae yellow, anterior side of front ones largely 
silvery; tarsi black, broad base of first joint of the middle and 
hind ones whitish; wings hyaline, veins along the costa yellow- 
ish brown, the others nearly hyaline; halteres yellow; length, 
2.5mm. 
In April. Kansas City, Missouri. 
S. griseum Coquillett 
Dep’t Agric. Div. Ent. Bul. 10, n. s. 1898. p.69. Colorado 
Female. Front and middle femora and tibiae wholly yellow, 
hind ones except their apexes also yellow, tarsi brown, bases of 
the first two joints of the middle and hind ones yellow; 
mesonotum grayish, indications of a darker median vitta, the 
sides and front corners yellow, pleura light gray, scutellum yel- 
low; abdomen gray, segments 2 to 6 each marked with three vel- 
 yet-black spots; wings hyaline, the costa, first three veins, and 
first section of the fourth, yellow, the others subhyaline; face 
and front light gray, antennae brown, the two basal joints yel- 
low, palpi black, proboscis yellowish. Length 1.5mm.  Colo- 
rado. Three females, collected by Mr Carl F. Baker. 
Male. Center of mesonotum with a narrow black vitta, 
mesonotum elsewhere gray, dorsum of abdomen velvet-black, 
the second and seventh segments and a spot on the sides of the 
eighth, silvery gray, otherwise as in the female. A male taken 
with the female specimens. 
S. hirtipes Fries 
Obs. entomol. Pars 1. Monogr. Simuliar. 1824. 17:5, Tfl. 1, f.1. 
1880 rufipes Meigen, Syst. Beschr. 6:311-17 
1830 hirtipes Fries, Meigen, Syst. Beschr. 6:312-18 
1850 hirtipes Fries, Zetterstedt, Dipt. Scand. 9:3426-28 
