AQUATIC INSECTS IN NEW YORK STATE 379 
S. tamaulipense Townsend 
N. Y. Ent. Soe. Jour. 1897. 5:171-72 
Female. Length 1.5mm. Near S. meridionale, but 
smaller, and the outer one on each side of the three thoracic 
lines not curved outward at posterior end. Eyes velvet-black, 
face and front silvery; front with usually a trace of a linear 
black vitta, in one specimen very distinct, in another entirely 
wanting. Antennae yellowish with a silvery covering. Thorax 
Silvery, with three longitudinal lines; middle one longest, very 
narrow and linear; outer ones heavier, straight, slightly diver- 
gent posteriorly. Looked at directly from above, the outer 
lines appear curved, outwardly convex. Scutellum and meta- 
scutum below scutellum, both brownish in some lights but in 
others they appear wholly silvery, the various portions appear- 
ing different in color to the view at the same time. Abdomen 
silvery but the third and fourth segments wholly brownish, 
sometimes with a round median spot on each. Legs yellowish, 
shaded with silvery, tarsi blackish or brownish; hind metatarsi 
yellowish except at distal end. Wings clear, whitish, veins 
dilute yellowish. Halteres and wing bases pale dilute yellow- 
ish. 
Four females, Reynosa, Tamaulipas. A small species taken 
on the windowpane of railroad car, May 4. Described from four 
dried specimens. Townsend 
S. venustum Say 
Acad. Nat. Sci. Phila. Jour. 1822. 1:28 and Compl. Wr. 2:51 
1862 molestum Harris, Ins. Inj. to Veg. 
1870 piscicidium Riley. Am. Ent. 2:367 
(Synonymy according to Coquillett, 1898) 
Male. Velvet-black. The eyes are very large, separated by a 
single line, reddish yellow, lower half black. Thorax velvet- 
black, a bright pearlaceous, dilated line each side before, and a 
large pearlaceous spot behind, sides beneath varied with pear- 
laceous. Abdomen with an oblique pearlaceous line at base, 
and two approximated lateral pearlaceous ones near the tip. 
Tibiae above, and first joint of four posterior tarsi white. 
Wings with yellow and iridescent reflections. Poisers black, 
capitulum bright yellow, dilated. Near Louisville Ky. at Falls 
of the Ohio. Say, loc. cit. 
Superhumeral gray stripes metallic, no metallic spots be- 
tween them; mesonotum not vittate with black. Coquwillett! 
The following description of the males is based on specimens 
from Ithaca N. Y. and Battle Creek Mich. Velvet-black. An- 
a — 
1U. S. Dep’t Agric. Bul. 10, n. s. 1898. 
