52 ENTOMOLOGICAL NEWS. [Feb., '13 



Thoracic dorsum ash-gray, opaque, inner vittae brownish fading 

 out abruptly at suture. Outer vittae expanded into blackish triangles 

 and ceasing immediately before suture. A circular blackish stain sur- 

 rounds bases of all dorsocentral macrochaetae. Posterior dorsocen- 

 trals two or three, some large bristly hairs scattered among ordinary 

 vestiture of dorsum. Scutellum with three pairs of marginals, apical 

 pair absent. Hairs of disc gradually increasing in strength toward 

 apex where the outermost may be termed macrochaetae. 



Abdomen ovate, bearing only marginals on all segments, broadly 

 cinereous on bases of segments two, three and four, remainder of 

 abdomen black, almost shining. 



Legs stout, black, middle tibiae with a stout bristle on front side 

 near the middle. Sternopleural macrochaetae four, the upper pair 

 very stout, the lower quite weak. 



Wings broad, hyaline, first vein incrassated on its apical third where 

 it bears three or four bristles, third vein bristly nearly half way to 

 small cross vein, apical cell open, ending in extreme tip of wing. 



Type. A female collected by the author at Hyattsville, 

 Maryland, deposited in U. S. National Museum, Washington, 

 D. C. 



The species above described is referred to Chactophleps 

 merely because it runs out there in Mr. Coquillett's key to the 

 genera. It cannot be placed in either Plcctops or Thryptocera 

 because the penultimate joint of the arista is not elongated, 

 although its habitus indicates conclusively a close affinity with 

 these forms. 



It seems probable that a separate genus will eventually have 

 to be erected for this species ; in the meantime it would be folly 

 to do so upon the unique type. 



EXPLANATION OF PLATE III. 

 Eutrixoides joucsii, n. sp. 



a, front view of head, male. 



b, wing. 



c, side view of head, female. 



d, front view of head, female. 



e, front tarsus of male. 



f, lateral view of abdomen, female. 



g, Eutrixa cxilis Coq., tip of abdomen, female, 

 h, Chactophleps crassinervis n. sp. wing. 



i, Chaetophleps crassinervis, head. 



