INSEJCUTOR INSCITI^ MENSTRUUS 145 



bright yellow, third joint very large, longer than broad ; arista 

 blackish. Face more deeply concave than in the male. Thorax 

 with short lutescent or golden pile. Legs as in the male except 

 that the tibiae lack the infuscate band on the middle and the 

 first tarsal joints of the fore and middle legs are yellow. 

 Abdomen entirely shining with short, dirty yellowish pile. 

 Wings with a brownish orange tinge, stigma more strongly 

 yellowish. Wings a little shorter and broader and the last sec- 

 tion of fourth vein much shorter than the male's. Squamae and 

 halteres like the male's. Length 9.35 mm. ; wing 7.5-8 mm. 



Type.—C?Li. No. 25388, U. S. Nat. Mus., one male, two 

 females. Type and paratype, females, Franconia, New Hamp- 

 shire (Mrs. Slosson) ; allotype, male, Littleton, New Hamp- 

 shire (F. F. Hodgemann). 



Chilosia capillafa Loew is its closest ally, but the male has 

 pale pile on frontal and ocellar triangles ; the third antennal 

 joint noticeably smaller ; no black pile or hairs on the thorax ; 

 no infuscate band on the fore and middle tibiae ; all the pile on 

 the abdomen is pale and shorter and the last section of the 

 fourth vein is shorter. The female has the third antennal joint 

 smaller and darker, the yellow on the legs not as bright and 

 the pile everywhere is paler. C. slossoni, female, has the third 

 antennal joint nearly equal in size to the third joint of C sig- 

 natiseta. In capillata the width of the face below the antennae 

 is noticeably greater than the length of arista while slossoni 

 has the width less than the length of arista. 



