AQUATIC IXSECTS IN XEW YORK STATE 369 



the other spines and hooks are as described, by Riley. 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 Kansas belonging to Pro- 

 fessor 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, 

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

 wath yellow i>ile? (aureo-sqnamuloso); humeri pale; pleurae 

 black, anteriorly and posteriorly with fuscous spots; scutelhim 

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

 second segment pale yellow'ish, 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. V i-t t a t u m Zett.) 

 Minn. Agric. 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 L 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. minu- 

 t u m received for study from Mr Washburn proved to be S. v i t- 

 t a t u m Zett. 



S. occidentale Town send 

 Psyche. 1801 



Female. Cinereous; abdomen light fulvous. Head cinereous, 

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

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



