BY ARTHUR WHITE. 



247" 



Eyes in the male joined above the antennae ; third 

 antennal joint short, usually broader than long, 

 with arista dorsal or subapical. 



D I A p H R u s, Meig. 



Eyes separated in both sexes. 4 



Last part of pastical vein (i.e., the part from the 

 discal cell to the wing-margin) much longer than 

 tne posterior cross-vein ; antennae in male with 

 the third joint elongated, with the arista arising 

 almost from its base. L i p a r o m y i a , Gen. nov. 



Last part of postical vein not longer than the pos- 

 terior cross-vein; antennae with the third joint 

 rounded and the arista dorsal. 



H Y D R o P H o R u s. Fall. 



60. SciAPus, Zell. (Fig. 49.) 



{Psilopus, Meig.) 



Slender metallic flies, having the discal vein forked, the 

 upper branch distinct, and often bent or a.ngulated in the 

 middle, the lower straight and indistinct ; posterior cross- 

 vein (i.e., the veinlet closing the discil cell) straight, waved., 

 or anofulated. 



Fig. 49. AVing of Seiapus cludceu^. 



Head as broad or broader than the thorax ; vertex rather' 

 deeply excavated. Eyes large, separated in both sexes. 

 Antennae situated a little above the middle of the head in 

 profile, all joints short, but the third a. little the longest, 

 and bearing a very long dorsal arista. Thorax usually bare 

 of pubescence, but with acrostichal bristles, which are 

 biserial, six dorsocentral, a humeral, a posthumeral, two 

 notopleural, a presutural, two or three supraalar, and a 

 postalar bristle; scutellum with two marginal bristles, and 

 on either side a small hair. Abdomen long and slender, 

 with or without lateral bristles. Legs long and slender, 

 with a few small bristles. Wings with the discal vein 

 forked, the upper branch of which, as well as the posterior' 

 cross-veiu, is either straiglit, waved, or Rngulated ; anal veinj 

 weak, and not reaching the wing-margin. 



