Sept. 1 899-] Coquillett: North American Dexid^. 219 



articulation less than one-fifth as long as height of head, labella very small. Body 

 opac[ue gray pruinose, thorax marked with four indistinct black vittae, bearing four 

 postsutural dorso-central and three sternopleural macrochreta?, hairs of abdomen de- 

 pressed, the last three segments bearing discal and marginal macrochsetse. Wings 

 grayish hyaline, the veins bordered with brownish, most distinct in the female, third 

 vein bearing three or four bristles near its base, veins otherwise bare, costal spine 

 longer than the small cross vein, the latter noticeably before the middle of the discal 

 cell, fourth vein strongly curved backward at the bend, the latter V-formed. Calyp- 

 teres gray. Hind tibire not ciliate, pulvilli of male greatly elongate. Length, lo to 

 II mm. 



Jackson, Fla. A specimen of each sex collected by Mrs. A. T. 

 Slosson. Type No. 411 7, U. S, Nat. Museum. 



Phasiops flava, gen. et. sp. nov. 



Male and female. Yellow, the frontal vitta of female yellowish brown, the 

 hairs and bristles black. Front in the male at the narrowest point not wider than 

 width of lowest ocellus, frontal vitta obliterated on nearly the upper half, front of 

 female slightly wider than either eye, frontal bristles descending to base of antennje, 

 four pairs of orbital bristles in the female, wanting in the male ; antennae not reach- 

 ing to middle of face, the third joint one and one-half times as long as the second, 

 longest hairs of arista about twice as long as its greatest diameter at its base ; face 

 considerably retreating below, the sides bare, the median carina very high ; vibrissa 

 inserted more than the length of the second antennal joint above the front edge of 

 the oral margin, two or three bristles above each, facial ridges arcuate, rather remote 

 at the vibrissae ; cheeks of male two-fifths, of female two-thirds as broad as the eye- 

 height, eyes bare, proboscis rather slender, the portion beyond the basal articulation 

 less than one-fourth as long as height of head, labella small, palpi nearly linear and 

 rather short. Body subopaque, thinly gray pruinose, thorax bearing four pairs of 

 postsutural dorso-central and two or three sternopleural macrochaetffi, second and 

 third segments of abdomen with marginal ones, hypopygium of male exserted and 

 curved under the abdomen. Wings hyaline, those of the female strongly tinged 

 with yellowish, veins bare, posterior crossvein nearly midway between the small and 

 the bend of the fourth vein, the latter arcuate, apical cell open, ending close to the 

 extreme wing-tip ; calypteres yellow. Hind tibiae not ciliate, pulvilli of male greatly 

 elongate. Length, 7 to 9 mm. 



Caldwell, New Jersey.. A specimen of each sex collected by Mr. 

 C. W. Johnson, whose generous donations have greatly enriched the 

 collection of Diptera of the National Museum. Type No. 4118, 

 U. S. Nat. Museum. An unusually short and robust form. 



Atelogossa cinerea, gen. et sp. nov. 



Male. Front less than one-fourth as wide as either eye, frontal bristles descend- 

 ing almost to base of antennae, no orbital bristles, antennae reaching halfway to the 

 oral margin, the third joint almost twice as long as the second, longest hairs of arista 

 twice as long as its greatest diameter at its base, head only slightly shorter at the 



