Dec, i9"^l Alexander: Revision of Brachypremxa. 231 



largely pale brown ; cell R^ «'''•> the extreme cephalic margin pale yellow, run- 

 ning down and ending at a drop in the end of cell R,: cell R. brown, with the 

 caudal margin sub-hyaline ; end of cell R^ dark with the yellowish spot above 

 described ; Rs dark at tip with a hyaline drop in the outer caudal angle ; cell -1/, 

 almost hyaline; veins with narrow brown seams; stigma usually with a large 

 sub-hyaline spot in under r, sometimes small or absent. Venation (see Fig. d) : 

 /?a rather long, beyond the arcuation longer than .U„. between cross-veins rm 

 and III ; basal deflection of Cm, beyond the fork of M. 



Abdomen ; tergum brown, extreme bases of the segments, pale yellowish ; 

 sternum light brownish-yellow with a distinct elongate-ovate black spot in the 

 middle of each segment. 



(J, wing, 21 mm. Fore femur, 12.7 mm.; fore tibia, 14 mm. 



$2, length, 17.4-17.9 mm.; wing, 18-18.S mm.; fore leg, femur, 11. 3-1 1.6 

 mm. ; tibia, 13-14.5 mm. ; hing leg, femur, 13.2-13.S mm. ; tibia, 13. 6-14.9 mm. 



Distribution.— Dutch Guiana: Cigi Makoc (H. Polak), Paramaribo 

 (Miss Mayo). Brazil: Igarape-Assu, State of Para (Parish), Rio 

 Blatico (H. H. Smith). 



B. brcviz-cntris may be readily distinguished by its dark femoral 

 and tibial tips and pale basal tibial ring. 

 Brachypremna williamsoni, new species. 



Tip of femur dark ; base and tip of tibia abruptly light colored ; wings tinged 

 with darl;er. 



(Jc7, length, 1 1. 3-15. 7 mm.; wing, 14. 8-19.3 mm. Fore leg, femur, 10 mm.; 

 tibia, 1 1.4 mm. (paratype No. i). 



Head ; rostrum brown ; palpi, basal segment mostly black, second yellow at 

 extreme base and tip, remaining segments brownish-black. Antenns. basal 

 segments, pale brown ; second, light yellow ; fl.igcllar segments with the base 

 brown, tip yellowish, the brown increasing on the outer segments. Front brown ; 

 vertex and occiput light brown, brighter colored adjoining the eye. 



Thorax : rather similar to breviventris . the long intermediate brown stripes 

 quite indistinct ; post-notum with the median brown stripe divided by a pale 

 median line. Pleurae without distinct brown spots. Halteres: base of stem pale, 

 thence gradually darkening to the brown knob. Legs : coxa: grayish-yellow, in- 

 distinctly spotted with brown ; femora brown, not darkened at the tip as in 

 breviventris ; tibia dark brown, a narrow ring at base and tip, pale yellowish- 

 white, tarsi brown, lighter colored toward the tip. 



Wings: conspicuously tinged with darker; costal cells brown; cell /?; with 

 a brown cloud in cephalic portion and a hyaline droplet near outer end ; 7?., dark 

 at outer end with a sub-apical hyaline spot ; R-^ similar with a conspicuous 

 rounded drop; .V„ cephalic margin of tip brown, caudal margin of tip with a 

 hyaline drop; cell M^ dark, not hyaline, as in breviventris ; veins with narrow- 

 seams of darker brown ; stigma brown, a pale spot in it just below cross-vein r; 

 (in the type c?. stigma clear brown). Venation (see Fig. e) : Rg beyond 



