AQUATIC INSECTS IN NEW YORK STATE 369 



the other spines and hooks are as described by Eiley. This 

 species has been reported from New York. I have also' seen 

 specimens from Moscow and Albion Id., Lawrence Kan. and 

 Axton N. Y.; those from Idaho and Kansasi belonging to Pro- 

 fesisor Aldrich. 



S. mexicanum Bellardi 

 Saggio etc. Apx. 6. 1862 



Male. Black. Head black, front prominent, triangular, with 

 whitish reflection; antennae black, first joint and base of second 

 yellow; face prominent, black, the epistome yellowish, with 

 grayish reflection; palpi black, paler at the base; thorax wide, 

 subqnadrate, slightly convex, black, with a grayish reflection, 

 with yellow pile? (aureo-sqnamuloso) ; humeri pale; pleurae 

 black, anteriorly and posteriorly with fuscous spots; scutellum 

 fuscous; the halteres white; abdomen black, the base of the 

 second segment pale yellowish, the second, third, fourth and 

 fifth pale yellowish on the sides; fore and middle coxae wholly 

 yellow, hind ones fuscous with yellow tips; fore femora wholly 

 yellow, the middle and hind pairs fuscous black, at base and tip 

 yellow; all tibiae fuscous-black with yellow bases; fore tarsi 

 wholly black; middle tarsi black, with bases of all the joints yel- 

 low; hind tarsi black with base of first joint widely and second 

 joint narrowly yellow; wings hyaline iridescent. Length 4mm; 

 extended wings 9mm. 



Mexico. 



S. minutum Lugger 



(=S. vittatum Zett.) 

 Minn. Agrie. Exp. Sta. Bui. 48. 1896. p.202. 

 The bulletin mentioned above contains a figure of the female 

 of a species which is said to be common near Minneapolis from 

 May 15 to June 1. No description is given excepting the state- 

 ment that it is very small. The figure represents a fly with an 

 unstriped thorax, the abdomen with a dark fascia on each seg- 

 ment, the fascia covering nearly the entire dorsal surface of 

 each segment, excepting the narrow basal and lateral margins. 

 Its legs are bicolored. Specimens bearing the label S. m i n u - 

 turn received for study from Mr Washburn proved to be S. vit- 

 tatum Zett. 



S. occidentale Townsend 



Psyche. 1891 



Female. Cinereous; abdomen light fulvous. Head cinereous, 



eyes black; face cinereous, raised and somewhat darker in the 



center, sparsely clothed with flue silvery hairs; front cinereous. 



