14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



Four males received; two (Brazilien, Coll. Winthera) are identi- 

 fied as longipes Wiedemann, one (Mexico, Bilimek) as inaequipes 

 Bigot, and one (Brasilia, Alte Sammlung) unidentified. These all 

 agree with each other and with Wiedemann's description, though 

 none are labeled type. They also agree with the description of in- 

 aequipes excej)t for the infuscation of the femora and tibiae and a 

 slight discrepancy in Bigot's description of the dark color of the 

 third and fourth abdominal segments. Giglio-Tos's description is 

 of a female and agrees exactly with our only tropical female in the 

 United States National Museum from Vera Cruz. 



Male. — Front at narrowest about as wide as the distance between 

 the posterior ocelli, widening considerably and uniformly to the 

 lower curve of the eye. Ocellars large, proclinate, not divergent. 

 A small pair of post-ocellars directed forward; frontals beginning 

 below the narrowest part, six or seven in number hardly reaching 

 base of antennae. Parafrontal widening rapidly to the parafacial 

 which is considerably wider than the third antenal joint and bears 

 perceptible minute hairs, mostly dark. Face flat, without keel, 

 slightly receding. The vibrissae considerably above the lower edge 

 of the head, but not approximated ; edge of the mouth with only two 

 or three small black bristles; cheek more than one-third the eye 

 height. Transverse impression brownish, rather large. Antennae 

 entirely yellow, third joint rather slender, more than three times the 

 second. Arista rather short, densely plumose to tip. Palpi yellow, 

 of normal size; proboscis small. Thorax with pale yellow, almost 

 silvery dense pollen to the suture when viewed directly from behind ; 

 this sometimes seems to extend to the scutellum, but in a rear view 

 the portion behind the suture is dark brown. Scutellum black with 

 thin brown pollen ; pleura with a silvery stripe from the notopleural 

 suture down across the sternopleura. Chaetotaxy : Acrostichal 2, 1 ; 

 dorsocentral 2, 3 ; humeral 2 ; posthumeral 1 ; presutural 1 ; notopleural 

 2; supraalar 1 (and a large hair just behind it) ; intraalar 1; posta- 

 lar 2 ; sternopleural 1, 1 ; scutellum with two large marginal, a long 

 apical decussate pair and a small discal; postscutellum well de- 

 veloped. Posterior calyj)ter quite large, almost transparent but 

 with a slight brown tinge; infraquamal setules very distinct, about 

 a dozen. 



Abdomen translucent yellow, the posterior third of the second 

 segment with a dark shade; third segment black on about the pos- 

 terior two-fifths which extends forward on the dorsum to the middle 

 or more; fourth segment wholly black, with silvery pollen all the 

 way round except at tip, but thinner on the dorsum; no discal bris- 

 tles even on the fourth segment. First without marginals, second 

 with a small pair, third with a row of four rather large, fourth with a 

 row of six. 



