30 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6G 



Zetek (No. 223(M) ; one female, Higuito, Costa Rica (Pablo Scliild) ; 

 one female, Puerto Barrios, Gnat., February 2-1, 1905 (C. C. Deam) : 

 one male, Tifton, Georgia, September 8, 1896 (G. R. Pilate, type of 

 aplcalis) ; one female, Raleigh, North Carolina, July, 1906 (Brimley) : 

 one female. Falls Church, Virginia, May 30 (Banks) ; and one 

 female, Great Falls, Virginia, August 9, 1923 (Aldrich). 



ATACTA CRASSICEPS. new species 



Male. — front very narrow at the ocelli, only about twice the width 

 of the ocellar triangle, widening very rapidly to the lower end of the 

 frontal row. The parafrontals are covered with somewhat golden 

 pollen which in most lights gives a brownish or almost black reflec- 

 tion; they are quite protuberant, a little inflated and rather densely 

 covered with erect black hairs. The frontal bristles begin a little 

 below the ocelli and the rows diverge rapidly below, ending close to 

 the eye at the level of the middle of the second antennal joint ; ocellar 

 bristles distinct and a dense tuft of hair behind them to the vertex. 

 Inner verticals are developed; face very flat with yellow pollen 

 through which a darker ground color shows on each side ; parafacials 

 bare with yellow pollen; its least width nearly equal to the length 

 of the third antennal joint. Antennae black, very slender, the arista 

 short, gradually tapering; its penultimate joint twice as long as 

 broad. Vibrissae considerably above the mouth (two-thirds the 

 length of the second antennal joint) with a group of half a dozeo 

 small hairs and bristles above them, the highest a little above the tips 

 of the antennae; palpi and proboscis of ordinary size; bucca one- 

 third the eyeheight. Thorax black with conspicuous stripes of white 

 pollen, which leave between them a pair of abbreviated black stripes 

 in front between the acrostichal and dorsocentral ; a pair of complete 

 black stripes beginning just mesad of the humerus and extending to 

 the scutellum; and a short median black stripe beginning at the 

 scutellum and extending forward nearly to the suture. Chaetotaxy : 

 acrostichals, anterior 3, posterior 3; dorsocentrals, anterior 2, pos- 

 terior 4; intraalars, posterior 3, anterior 1; supraalar 3; postalar 2; 

 humeral 3 and 4; sternopleural 4; scutellum with three equal pairs 

 of the margin, the last of which might be called apical, and one pair 

 discal. Abdomen black with gray reflecting pollen which on the 

 fourth segment becomes more dense and yellowish-gray in color; the 

 second segment with a single pair of marginals ; third segment with 

 about five pairs; fourth segment with five or six pairs in a single row 

 considerably before the apex. Genitalia small and concealed, of a 

 rather common type. Fifth sternite with a U-shaped incision, the 

 lobes black and almost bare. Legs black, the middle tibia with three 

 or four bristles on the outer front side, the hind tibia distinctly 

 ciliated on the outer side with one longer bristle below the middle. 



