INSECUTOR INSCITI^ MENSTRUUS 95 



of the types species varia. Head high and short, front nearly 

 horizontal, antennae inserted high and partially concealed in 

 profile in a deep facial excavation which extends to the edge 

 of the mouth ; lower edge of head about as long as the front, 

 giving the head in profile a nearly rectangular form, the an- 

 terior and posterior sides almost parallel ; third joint of an- 

 tenna long and wide, reaching almost to the vibrissas, which 

 are at oral margin, arista bare. Eye of peculiar shape, elongate 

 vertically with anterior and posterior margins parallel for some 

 distance, its lower edge almost reaching edge of mouth, so there 

 is only a very narrow bucca or "cheek ;" parafacial also very 

 narrow, with a sharp edge bounding the deep facial excava- 

 tion ; front parallel-sided, of equal width in both sexes, with 

 a single row of five bristles on each side, which extend only to 

 the antennal insertion. Ocellars normal, a pair of small hairs 

 behind them, then a pair of good-sized divergent post-verticals. 

 The usual two pairs of verticals, proboscis small, palpi of 

 ordinary size. 



Thorax rather narrow, with large humeri, chaetotaxy as 

 follows : dorsocentrals four behind and two before the suture, 

 but all very small and hardly distinguishable except the hind- 

 most two, humeral 3, posthumeral 1, presutural 1, notopleural 

 2, prothoracic 2, mesopleural only 1 large and 2 smaller along 

 hind edge, sternopleural 3 in an almost equilateral triangle, 

 supraalar 1, prealar indistinguishable, intraalar 1 and a couple 

 of hairs, postalar 2, prescutellars only a minute pair, anterior 

 acrostichals in a double row but irregularly widening back- 

 ward ; scutellum bare below. Hind calypter much exceeding 

 front one, as in Coenosia. 



Wing as in Coenosia, but the anterior crossvein before the 

 end of the first vein, barely beyond end of auxiliary ; costa 

 somewhat bowed before tip of aiixiliary, widening the costal 

 cell ; sixth vein does not reach margin. 



Legs with one noteworthy feature — the front femur lacking 

 the usual row of bristles on outer lower edge, bearing only one 

 near the tip. 



