ART. 20 REVISION OF THE GENUS WINTHEMIA REINHAED 39 



of antennae ; paraf rentals gi'ay pollinose, with scattered short hairs 

 and a few bristles outside of the frontal rows; uppermost frontal 

 bristles reduced in size and stopping at triangle, the lower ones on 

 level with base of third antennal joint; ocellars small or hairlike; 

 orbitals none; outer verticals about half as long as inner ones; 

 median stripe brownish black, a little narrowed behind but at tri- 

 angle distinctly wider than one parafrontal; sides of face gray, 

 bearing a few black hairs, none extending next to the eyes ; antennae 

 blackish, reaching lower fourth of face, third joint hardly twice 

 the length of second and only slightly wider than the parafacial 

 at narrowest part; arista black, long and slender, basal joints short 

 but distinct; cheeks blackish, thinly covered with gray pollen, about 

 one-seventh the eye height; palpi yellow, beset with numerous short 

 black hairs. 



Thorax black, gray pollinose ; mesonotum marked with four broad 

 distinct black stripes; scutellum broadly reddish, dusted with change- 

 able pale-gray pollen, bearing the usual three lateral, one discal, and 

 one small decussate apical pair of bristles ; calypters tawny. 



Abdomen black in ground color, the sides and apex reddish yellow; 

 last three segments with gray pollen, which in dorsal view includes 

 about the basal half of each, fourth segment with three reflecting or 

 changeable spots on basal margin above; segments 1 and 2 without 

 median marginals; third with a marginal row of about 8; fourth 

 with a row of weak marginals and covered with bristly hairs in front ; 

 hairs on intermediate segments depressed ; venter with a large sharply 

 defined patch of long matted hairs on third segment which extends 

 without interruption on the basal margin of the fourth ; inner genital 

 forceps blackish, narrow at base tapering uniformly to an acute 

 undivided tip; outer forceps yellow, about as long as inner ones, 

 perceptibly narrowed near middle with the anterior extremity 

 broadly produced. 



Legs black; mid tibiae with one stout bristle on outer front side 

 near middle; hind tibiae evenly ciliate; claws and pulvilli elongate. 



Wings faintly brownish along the costa and at base; venation 

 normal; third vein with one hair at base; costal spine minute. 



Length, 9.5 mm. 



Female. — Unknown. 



Type.—M^lQ, U.S.N.M. No. 43347. 



Described from 1 specimen from Tucuman, Argentina, March 21, 

 1918, " ex black woolly bear," with puparium on pin, no collector's 

 label. 



(23) WINTHEMIA IMITATOR, new species 



Male. — Front 0.187 and 0.205 of the head width in the two speci- 

 mens, slightly narrowed before triangle, widening rapidly downward 



