230 A. L. MELANBEK. 



antennpe to the ocelli ; antennae directed outwards, short, plainly 

 three-jointed, the third joint not longer than deep, flat above, with 

 a dorso terminal, very slightly and finely pubescent arista, but little 

 longer than the antenna. Labruni prominent, convex, cheeks 

 prominent, straight below ; proboscis stout, shining, folding back 

 between the front coxse, shorter than the head height ; palpi short 

 and broad, disc-shaped, hanging down, covered with black hairs 

 and provided with an apical bristle. Thorax stout, cut straight in 

 front, somewhat flattened above, densely black-bristly, a few longer 

 bristles present along the lateral edges of the dorsum, the inner pair 

 of short acrostichals distinct; disc of scutellum, metathorax and 

 abdomen not bristly, scutellum with four marginal bristles. Abdo- 

 men flattened, near the centre of the lateral margins of each of the 

 dorsal segments is a small black spot, probably the place of attach- 

 ment of vertical muscles ; * hypopygium small, terminal, ending in 

 a short curved ventral process. Legs stout, all the femora greatly 

 thickened, the hind ones reaching to the end of the abdomen ; legs 

 covered with bristly hairs ; femora beneath and hind femora above 

 near the tip with raacrochsetse, tibise on outer side with macrochsetse ; 

 tarsi simple, the joints evenly decreasing in length, but not in thick- 

 ness, pulvilli large. Wings reaching to the end of the abdomen ; 

 costa evident and provided with fine dark hairs to beyond the tip 

 of the third vein ; no indication of an anal cell ; anal angle very 

 broadly rounded, rectangular. 



^ C-oIoboiieura inusitata sp. nov. (Figs. 47, 48, 49). 

 ilfa^e.— Length 3.5 mm. Black, completely covered with silvery-gray pollen, 

 thiuning out posteriorly on the abdomen. Antennae short, black. Proboscis 

 shining, black ; palpi piceous, gray pollinose. A small, shining, yellowish, post- 

 humeral callosity present. Hypopygium dark piceous, with a few short, black, 

 stifl" hairs on upper left side, which consists of a small convex plate, the under 

 right side more or less flattened and contorted. Coxse gray pollinose ; femora 

 black, becoming fuscous at the knees, tibise and tarsi fuscous, last joint piceous; 

 legs shining. Halteres short, whitish. Wings opalescent, first vein, second and 

 third on outer half of the wing, and fifth vein on inner half pale testaceous, re- 

 maining veins very faint or wanting altogether; costal bristles black, sharply 

 contrasting with the veins. 



Two males ; Wood's Holl, Mass., July 13, 1899 (Wheeler) ; Lake 

 Worth, Florida (Mrs. Annie T. Slosson). 



* These abdominal spots remind one of the analogous markings of Thelyphonus 

 and the similar ones of many Dolichopod genera, in which cases the spots are 

 indicative of the attachment of the musculature, as the upper spots are connected 

 with the lower by a series of vertical muscles. 



