1919] NATURAL SCIENCES OF PHILADELPHIA. 171 



DIPTEROLOGICAL NOTES AND DESCRIPTIONS. 



BY EZRA T. CRESSON, JR. 



This paper is a collection of notes on, and descriptions of, North 

 American Diptera, made at various times while working over mater- 

 ial sent to the writer for determination. It may here be explained 

 that the data within brackets, [ ], refer to the owners of the material 



in question. 



STRATIOMYID^, 



Zabrachia magnicornis new species. 



Similar to polita, but differing in having the frons more curving, 

 without the median longitudinal sulcus; the antennae are much 

 larger, the scutellum more strongly developed, and the legs darker. 

 9 . Black; antennae brownish, appearing hghter from the dense, 

 appressed, pubescense or minute granulations. Halteres white with 

 stalk fuscous. Apex of femora, entire middle and hind tibise, tawny; 

 apex of fore tibise, and tarsi, darker; middle and hind tarsi yellow. 

 Wings hyaline. All pile white and appressed, sometimes appearing 

 silvery. 0\ipositor yellow. Frons not sulcate medianly, convex 

 and distinctly protruding above. Antennae typical but large, situ- 

 ated in the depressed portion of the face and lower frons; third joint 

 nearly as broad as the frons, twice as broad as long; arista straight, 

 two and a half times as long as third. Scutellum strongly convex 

 and subtuberculate above. Stigma hardly twice as long as broad; 

 discal and posterior veins colorless. Length, 3.5 mm. 



Type. — 9 ; Alamogordo, New Mexico, June 6, 1902, (Viereck & 

 Rehn), [A. N. S. P. No. 9192]. 



A male (2 mm. long) from the same locality may belong here, but 

 in general appearance it seems as though it should be associated with 

 polita. However, in the short stigma and third vein it suggests the 

 present species. In this male the head is nearly round in profile. 

 Antennae dark tawny. All pile erect and white, otherwise similar 

 to polita. Apices of all femora all tibiae and tarsi, yellow. 



A small female (head wanting) seems to agree with this male in 

 all respects as to color. 



EUPARHYPHUS Gerst. 



The furcation of the third vein is apparently of no specific value; 

 a female of tetraspilus from Aweme, Manitoba, Canada (E. Criddle, 



