INSECUTOR INSCITI^ MENSTRUUS 49 



bred, and in some cases poorly developed and the markings 

 not well shown. 



Legs ; coxae and trochanters greenish, having a few brown 

 scales and bristles ; femora are somewhat swollen, and light 

 ventrally practically to the apex, otherwise the legs are brown ; 

 ungues simple and equal. 



Wing membrane slightly darkened, the veins heavily clothed 

 with dark brown clavate scales, especially noticeable on the 

 forks of the second and fourth long veins. The first sub- 

 marginal cell is comparatively long, much longer (more than 

 three times) than its petiole, and about as wide as the second 

 posterior cell, the stem of which is not quite half as long as 

 the cell ; posterior cross-vein is more than twice its length 

 distant from the mid cross-vein. Halteres have white stems 

 and dark knobs. 



Length, 3-3.5 mm. ; wing, 3 mm. 



Male. Proboscis dark, somewhat swollen as in the female; 

 palpi brown, longer than the proboscis by nearly the two apical 

 joints, which are a little lighter than the more proximal joints, 

 accuminate, and sparsely hairy, the plumes having light reflec- 

 tions so as to appear almost fawn colored. The antennae are 

 plumose, light between the nodes, the verticels dark, distal 

 joints slender, very hairy. General coloration as in the fe- 

 male ; wing cells shorter ; ungues unequal, the larger uniserrate. 



There is also a single male differing in markings in that it is 

 more definitely black and white instead of brown and grayish, 

 and the abdominal spots are clear white and extend on the 

 dorsum so as to form almost continuous bands, very narrow, 

 sometimes lacking on the median portion, and broadening to- 

 ward the lateral spots. The description cannot be made more 

 definite because in removing the apical segments, the abdomen 

 was broken off. Apparently the insect is a little longer than 

 the other male, about 4 mm. The differences seem small, but 

 in the hand, and under the hand lens were sufficient to lead to 

 the suspicion that we were dealing with another species. 



Hypopygium. Side piece enlarged basally, tapering to a 

 small conical tip. Clasper attenuated mesially, rather narrowly 



