363 



Differs from fumipennis Malloch in having the legs entirely yellow 

 and the infiiscation of the wings carried to the base. 



Gaurax interruptus, n. sp. 



Female. — Ochreous yellow, slightly shining. Head yellow, ocellar 

 region, inner upper mouth-margin, and back of head black, arista 

 brownish. Mesonotum with the three vittse faintly indicated anteri- 

 orly, black on posterior third from transverse median line of disc mid- 

 way to posterior margin ; pleurae with a large glossy black central spot 

 and the upper margin narrowly black; scutellum brownish black except 

 the margin; postnotum yellow above, black below. Abdomen black 

 dorsally, segments paler on anterior margins, venter yellow. Legs yel- 

 low. Wings hyaline, veins grayish. Halteres yellow, knobs white. 

 Bristles on head and thorax black, hairs yellowish. 



Frons opaque, over one third the width of head, surface with 

 numerous setulose hairs, those on vertex, lateral margins, and a pair 

 on center of anterior margin strong; antennae rather small, arista 

 short-haired; eyes sparsely haired; triangle poorly defined. Mesono- 

 tum with less noticeable surface hairs than in most species of the 

 genus; scutellum with short discal hairs and 4 marginal bristles, the 

 apical pair strong. Abdomen and legs normal. Third costal division 

 of wing about four fifths as long as second; veins 3 and 4 subparallel, 

 the latter ending in wing tip. 



Length, i mm. 



Type locality, Urbana, 111., July 5, 191 5, at rest on cypress tree 

 trunk (J. R. Malloch). 



This species is separable from ephippium by the interrupted tho- 

 racic vittse, and the discal spot on scutellum. 



Urbana, IHinois, December 3, 1915. 



