AQUATIC INSECTS IX NEW YORK STATE 370 



S. tamaulipense Townsend 

 X. Y. Knr. Soc .iMiir. 18!»7. ."i :1 71-7:2 ' 



Female. Length l.omiii. Near S. m e r i d i o n a 1 e , but 

 smaller, and the outer one on each side of the three thoracic 

 lines not curved outward at posterior end. Eves velvet-black, 

 face and front silvery; front v^ith 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 e,cutellum, 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 segiuents 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. ^A'ings clear, whitish, veins 

 dilute yellowish. Halteres and wing bases pale dilute yellow- 

 ish. 



Four females, Keyuosa, Tamaulipas. A small species taken 

 on the windowpane of railroad car, May 4. Described from four 

 dried specimens. Toirnscnd 



S. venustum Say 

 Acad. Nat. Sci. Fbila. Jour. 1822. 1:2S and Compl. Wi'. 2:.j1 



1862 m o 1 e s t u m Harris, Ins. luj. to Yeg. 

 1870 p i s c i c i d i u m Riley. Am. Eut. 2:367 



(Syiiunymy 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 ])earlaceous 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. 



t^uperhumeral gray stripes metallic, no metallic spots be- 

 tween them; mesonotuin not vittate with black. CoqiUllett^ 



The following description of the males is based on specimens 

 from Ithaca N. Y. and Battle Creek Mich. Velvet-black. An- 



lU. S. Dep't Agric. Bid. 10, n. s. 1898. 



