DIAPIIORUS. IDT 



long and slender ; their first joint about as long as the other three 

 together, the pulvilli considerably enlarged and elongated. Middle 

 tarsi like the fore tarsi and of a similar color, but their first joint 

 about as long as the other four together, and the pulvilli not 

 quite so large and not quite so elongated as on the fore tarsi. 

 Hind tarsi more infuscated, only the root of the first joint brown- 

 ish-yellow. Tegulae whitish with whitish cilia. Halteres also 

 whitish. Wings hyaline, but very little tinged with gray ; veins 

 brown-black ; the posterior transverse vejn rather exactly in the 

 middle between the root and the tip of the wing ; the first longi- 

 tudinal vein reaches but very little beyond the third part of the 

 length of the wings. 



Female. Face very little broader than in the male, with thick 

 white powder, although appearing gray on account of the appa- 

 rent dark ground-color ; it is somewhat deepened upon its larger 

 upper part and gently convex upon its smaller lower part ; both 

 parts are divided by an imperfect transverse swelling. Palpi 

 whitish, near the basis somewhat gray. Antennae considerably 

 smaller than in the male, the third joint much smaller, rounded, 

 with an almost imperceptible angle below the insertion of the 

 arista. Front more broad and more green than in the male. 

 Tarsi shorter and usually somewhat more infuscated than those of 

 the male. The pulvilli not enlarged. 



Hob. Maryland. (Osten-Sacken.) 



Observation 1. — I believe that I am not mistaken with regard 

 to their belonging together, but I rather preferred to describe 

 them separately. If, contrary to expectation, they should prove 

 as not belonging together, then the name must remain to the male, 

 which I consider as typical. 



Observation 2. — D. leucostomus approaches in its entire habitus 

 several species which I believe must be referred to Chrysotus more 

 than any other species of the genus Diaphorus, known to me. The 

 elongation into a point of the third joint of the antenna? in the male 

 seems to indicate a relationship to Synarthrus barbatus ; neverthe- 

 less the latter differs materially by its narrow, not deepened face, 

 by the conspicuously elongated third joint of the antennas and 

 also by the entirely apical insertion of the arista. 



