242 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



of abdomen yellowish or brownish, basal two segments dorsally 

 yellowish. Hairs and bristles on body yellow; tibial spur black. 



Frontal triangle elongate, occupying almost the entire width of 

 frons at vertex, and extending almost to the extreme anterior margin 

 of frons; sides straight, apex acute; surface hairs on frons pale, 

 sparse; those on triangle forming a marginal line; antennae of 

 moderate size; arista bare, darkened on apical portion, barely as 

 long as breadth of frons; proboscis fleshy, apical portion bent back 

 under basal, but not as long as that part; cheeks glossy, about as 

 high as third antennal joint; eyes bare, slightly higher than long. 

 Mesonotum with lateral rows of hairs double from in front of middle, 

 the center row single, the row between the center and lateral rows 

 complete from anterior to posterior margins; surface of mesonotum 

 very obscurely granulose; disk of scutellum distinctly granulosa; 

 apical marginal pair of bristles cruciate, approximated at base, their 

 bases inserted in very slight tubercles, other marginal hairs weak, 

 only one pair, in addition to the apical pair, noticeable. Hind tibial 

 spur situated distinctly in front of apex of tibia, and about equal in 

 length to tibial diameter. Wings clear, veins yellowish, third costal 

 division slightly over one-half as long as second; veins 3-4 slightly 

 divergent; outer cross vein slightly oblique, last portion of fifth vein 

 1^ times as long as penultimate section of fourth. 



Length, 1-1.5 mm. 



Described by Becker from Alabama (Aldrich). Specimens in col- 

 lection from Dallas, Texas, March 15, 1907, "on wild plum" (F. C. 

 Bishopp), three specimens; Plummers Island, Maryland, May 25, 

 1912 (H. S. Barber), 1 specimen; Rosslyn, Virginia, September 2, 

 1912 (R. C. Shannon), 1 specimen. 



Nothmg is known of the early stages of this species, and, from the 

 above data, there are evidently several generations m the year. 



2. HIPPELATES NUDIFRONS, new species. 



Figs. 5, 8. 



Female. — Glossy black; head except frontal triangle and occiput, 

 base of abdomen, legs and halteres reddish yellow. Wings clear, 

 veins yellow. Bristles and hairs on thorax and abdomen yellow. 

 Tibial spur black. 



Frontal triangle occupying almost the entire width of frons at 

 vertex, forming an equilateral triangle, its sides straight, apex about 

 two-thirds the distance to anterior margin of frons; width of front 

 a little more than that of either eye, its surface almost entirely bare ; 

 antennas slightly under the normal size, third joint disklike; arista 

 bare, not as long as width of frons ; cheeks rather higher than width 

 of third antennal joint; palpi normal; proboscis entirely yellow, genic- 

 ulated but not thin, the end portion slightly shorter than basal ; eyes 



