38 H. C. HUCKETT 



infuscated; femora largely infuscated; tibiae yellow. Tarsi black. Pulvilli infuscated. Wings 

 slightly yeUowish; veins j'ellowish brown. Calyptrae yellowish. Halteres j-ellow. 



Eyes separated, at narrowest part, by a distance equal to twice that between posterior 

 oceUi; parafrontals not contiguous. ParafrontaFs and parafacials, in profile, promineat, 

 at base of antennae equal in width to breadth of third antennal segment. Frontal vitta with 

 a pair of weak cruciate biistles. Anterior pair of ocellar bristles strongly developed. Cheeks 

 broad, at narrowest part equal in breadth to length of third antennal segment. Vibiissal 

 angles approximated, separated by a distance less than length of third antennal segment. 

 Ventral half of occipital region of head considerably swollen. Antennae with second segment 

 short, as broad along distal margin as its greatest length; third antennal segment roimded 

 at apex, two or three times as long as broad; arista ■with the hairs long and few, sparsely dis- 

 tributed on opposite sides of segment, similar in appearance to the rays of Miisca domestica; 

 base of arista considerably swollen. Thorax with the acrosticals arranged irregularly in 

 two closely adjacent rows, with usually two or three pairs of weak presutural bristles. Pra 

 less than half length of the following bristle. Sternopleural bristles. 1: 2, with a weaker third 

 posterior bristle. Abdomen narrow, cylindrical, wUh stout, long, marginal bristles on 

 dorsum; processes of fifth sternum clothed with short setulae and a few longish lateral bristles; 

 apices slightly tapering and devoid of setae, with a few hairs present. Fore femur with a 

 proxdmal series of short anteroventral bristles; fore tibia with one anterodorsal and one median 

 posteroventral bristle. Mid femur with a proximal series of posteroventral bristles; mid tibia 

 with one anterodoisal, one posterodorsal, and two posteroventral bristles. Hind femur with a 

 complete series of anteroventral bristles; posteroventral surface bare except for one basal and 

 three or four apical bristles; hind tibia with four or five anteroventral, four or five anterodorsal, 

 and three posterodorsal bristles; posterior surface with an irregular series of setulae. Tarsal 

 claws and puh-illi well developed. Costal thorn small. Upper calyptra covering the lower. 

 Length, 6 mm. 



Female. — Similar to male except for the following characters: Thorax with only a trace 

 of a median vitta and lateral fasciae on disk. Abdomen non-vittate. Fore and mid femora 

 infuscated along dorsal surface; hind femur yellow. Eyes separated by a broad frons; cruciate 

 bristles weakly developed. Sternopleurals, 1:1. Abdomen conical. Mid femur with two 

 basal setae on ventral suiface, the antero- and posteroventral surfaces bare except for the 

 usual apical setae. Hind femur with an interrupted row of anteroventral bristles, the postero- 

 ventral surface bare except for three or four apical .setae; hind tibia with no series of setulae on 

 posterior surface. Tarsal claws and pulvilli small. Wings broad and somewhat abrupt; 

 costal thorn distinct; m-cu cross-vein straight. Length, 6 mm. 



Localities. — 1 9 . Hempstead. Long Lsland, August 4, 1921; 7 6,19, Glen Head, Long Island, 

 August 10, 1921; 2 9 , August 18, 1921; 116, Cold Spring Harbor, Long Island, September 10, 

 1921; 26 . September 16, 1921; 2 6 , September 4, 1922; 1 6 , Renwick, Ithaca, August 11, 1921; 

 46, 19, Glen Head, Long Island, August 11, 1921. 32 specimens: 27 males, 5 females. 

 Figures 50, 140, 15.5, 168, on plates in this memoir. 



Type, allotype, and paratypes. — In the Cornell University collection, Ithaca, New York. 



Paratypes. — In the United States National Museum collection, Washington, D. C. 



There ls a considerable variation in the infuscation of the femo a in 

 the series of ma'e specimens of Neohylemyia mallockii before the writer. 

 All but one of the specimens that were caught at Glen Head, Long Island, 

 on August 10 and 11, 1921, have all the femora largely infuscated; in the 

 one exception, the hind femora are yellow. In the series of specimens 

 that were caught at Cold Spring Harbor, Long Island, on September 10, 

 1921, the fore femora are partly or wholly infuscated, and the md and 

 hind femora are yellow. Similarly, there appears to be a variation in the 

 two series concerning the chaetotaxy of the legs. In the specimens from 

 Glen Head, the anteroventral surface of the mid femora and the postero- 



