AMERICAN DIPTEEA. 33 



COXTRIBITIONS TO THE DIPTEROL,0€JY OF 

 NORTH Axil ERIC A.— I. SYEPHIDiE. 



BY C. H. TYLER TOWNSEND. 



It is proposed, in a series of papers under the above caption, to 

 give notes and descriptions of North American Diptera in the 

 Townsend collection, which now forms a part of the University of 

 Kansas collection of Diptera. The present paper treats of the ^jr- 

 phidi3e, seventy-five species being enumerated. It is unnecessary to 

 more than point out the use of describing specimens from different 

 localities, showing wherein they differ from the original descrijition, 

 as I have done. By this means variations are tabulated, and the 

 limits of species determined. 



All of the types herein described are to be found in the University 

 of Kansas collection, as well as all others heretofore described by 

 the author. 



1. microdoii boinbiforiiiis n. sp. 



Leiistli i;5 nini. (with abdomen tiexed under) ; actual leugtli 14 mm. ' Ditfers 

 fnmi Willistou's description of trisfifi as follows: Front and face of equal width, 

 metallic green, clothed with pale brassy-yellow pile ; transverse groove of front 

 distinct. Dorsum of thorax, pienrse, scutellum, and tirst and second segments of 

 abdomen shining green, clothed with the same pale brassy-yellow jiile, which is 

 thickest on scutellum and thorax. Scutellum slightly emarginate behind, the 

 corners corresponding to the spines being obtusely angular. Eest of abdomen 

 short, black, hairy, more 'apparent on sides of third segment. Third segment 

 deep, soft black, but shining, with a slight greenish lustre. Fourth and fifth seg- 

 ments unift)rmly black and shining, with a pui-plish lustre ; ovipositor pale 

 brownish, exserted. The abdomen is but little longer than wide. Legs black, 

 only black hairy, but the hairs of tibite and tarsi show a golden reflection in ob- 

 lique lights; tips of tarsi more brownish. The legs are stout, and the hind meta- 

 tarsi are rather broad, but hardly moi-e so than the other joints. Pulvilli and 

 base of claws yellowish. Wings with all the veins broadly and evenly clouded 

 with flavous smoky ; the narrow spaces left are nearly hyaline. 



Dixie Landing, Va. (near Washington, D. C.) June 1. One $ . 

 I can hardly identify this with megalogaster Snow, from the differ- 

 ence in the wings. 



2. jflierodon fuscipeniiiiii Macq., Williston. 



^^'illiston describes only the male. The female differs as follows 

 from his description : 



TRANS. AM. ENT. SOC. XXII. (5) MARCH, 189.5. 



