22 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.79 



(10) WINTHEMIA OCCmENTIS, new species 



MaJe.— Front (before ocelli) 0.18 of the head width (average of 

 five: 0.19; 0.18; 0.18; 0.17; 0.18), widening rapidly beyond middle to 

 base of antennae; paraf rentals covered with golden pollen fading 

 out upward becoming blackish and subshining before vertex, mod- 

 erately haired outside of frontal rows ; median stripe brownish black, 

 wider than one parafrontal on its entire length; verticals one pair 

 (inner), not very large; orbitals none; ocellars of ordinary size, 

 directed forward, not at all divergent ; f rontals about 12 in number, 

 extending opposite to apex of second antennal joint, uppermost 

 bristles small, decussate, situated well before apex of ocellar triangle ; 

 face gray pollinose, the sides concolorous below and golden from the 

 lowermost frontals upward, sparsely clothed with rather coarse black 

 hairs except along the margins of the eyes; antennae black, third 

 joint tinged with red near base on inner sides, less than twice the 

 length of second, slender but distinctly wider than parafacial at 

 narrowest; arista thickened and reddish on proximal third, black in 

 color beyond, penultimate joint as broad as long; cheeks blackish 

 and thinly gray pollinose, thickly beset with fine black hairs, in 

 profile about one-eighth the eye height; palpi black or often the tips 

 yellow, slender ; back of head with a dense ruff of grayish-white hairs 

 faintly tinged with yellow above. 



Thorax black, lightly dusted with gray pollen, mesonotum shining 

 except in a flat rear view, the stripes largely obliterated; scutellum 

 reddish beyond basal third, faintly pruinose, bearing three lateral, 

 one discal, and a good-sized decu.ssate apical pair of bristles; calyp- 

 ters opaque, golden becoming paler toward middle. 



Abdomen black, with the sides and narrow apex conspicuously 

 reddish; last three segments broadly covered with pollen, which on 

 the narrow base of each is almost golden, becoming paler or grajash 

 apically; intermediate segments shining on posterior half at the 

 sides and on the narrow apices above; fourth shining on apical 

 third, the pollen on basal margin interrupted by a black change- 

 able stripe on either side of a constant median one, which extends 

 forward narrowly on the third segment thence expanding and 

 broadly interrupting the pollen from apex to base on second seg- 

 ment ; basal segment without median marginal bristles ; second with 

 or without one pair; third with a marginal row of about 10; fourth 

 with several irregular rows on apical half; hairs on intermediate 

 segments depressed; venter without any defined patches of dense 

 hairs ; genital segments reddish yellow, small and retracted. 



Legs black; mid tibiae with one bristle near middle on outer 

 front side ; hind tibiae evenly ciliate ; claws and pulvilli elongate. 



