40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



gium is moderately large with small, blackish lamellae, which are 

 narrow with nearly parallel sides and blimt tip; hairs of abdomen 

 black, short, with a few pale ones mixed with them. 



Fore coxae and all femora green, dulled with white pollen, the 

 former with long yelloAvish hair; all trochanters yellow; fore and 

 middle femora moderately but distinctly thickened at base, the for- 

 mer with slender yellowish hairs below; middle femora with a row 

 of minute black spines below, at base double; hind femora a very 

 little compressed with a close set row of black spines or short bristles 

 below (fig. 78) ; fore and middle tibiae blackish, the former without 

 bristles but Avith yellow tomentum below ; posterior tibiae black with 

 broAvn pollen and pale brown ver}^ short hair (fig. 78), greatly 

 inflated, almost as thick as wide, evenly rounded from base to tip, 

 widest near the middle. All tarsi blackish, the posterior pair have a 

 peculiar stiff tapering appearance, as in figure 78 ; length of posterior 

 femora as 120, width as 17 ; length of their tibia as 190, width near 

 the middle as 47; joints of fore tarsi as 57-16-10-8-18; of middle 

 ones as 77-21-10-7-15; joints of posterior ones as 46-34-19-11-17. 

 Calypters whitish with brown edge and yellowish cilia; halteres 

 yellow. 



Wings dark grayish ; more than three times as long as wide ; first 

 vein not quite reaching the middle of the wing; second and third 

 veins nearly parallel, but slightly divergent to their tips; last section 

 of fourth vein slightly bisinuous, nearly parallel with the wing mar- 

 gin, and in approximately the same line as the cross vein ; its tip not 

 far back of the tip of third vein; apex of wing at tip of third 

 vein, or perhaps between the tips of third and fourth veins, the wings 

 being a little widened at tip ; cross vein parallel with the hind mar- 

 gin of the wing ; last section, of fifth vein very short ; cross vein 74, 

 last section of fifth vein if continued to wing margin would be 13 

 and last section of fourth vein about ninety-five fiftieths of a milli- 

 meter long; sixth vein strong, tapering, not reaching the wing 

 margin. 



Female. — Thorax about as in the male, the scutellum green with 

 brownish pollen. Face and front wide, very much as in Pelasto- 

 neuTus; upper part of face velvety brown, below the suture brown in 

 the middle, broadly whitish pollinose along the orbits and on lower 

 edge, it extends down nearly or quite as far as in the male; front 

 yellowish-brown pollinose; ocular bristles short and straight as in 

 the male ; palpi about as in the male in form and size, mostly velvety 

 brown; hind femora bent, without spines below; fore and middle 

 femora scarcely enlarged at base ; without spines or long hair below. 

 Abdomen depressed, blue with purple and green reflections, its hairs 

 ,as in the male, except that there is a cluster of long black hairs on 

 each side of first segment and long yellowish hairs on posterior mar- 



