ABT. 20 EEVISION" OF THE GENUS WINTHEMIA ^REINHAED 41 



Tijfe. — In the Illinois State Natural History Survey Museum, 

 Urbana, 111. 



Described from two specimens received from Dr. T. H. Frison, 

 collected at Brownsville, Tex., November 29 and December 1, 1910, no 

 collector's label. 



This species might be mistaken for intermedia without examining 

 the genitalia, but may be distinguished by the longer second antennal 

 joint, yellow calypters, stouter and shorter legs, and denser pollen 

 on fourth abdominal segment. 



(24) WINTHEMIA INTERMEDIA, new species 



Plate 1, Figure 4 



Face and front gray pollinose ; sides of abdomen broadly reddish ; 

 thoracic stripes widely separated and distinct; male often with a 

 partial secondary row of frontals outside of the main rows below. 



Male. — Front (before ocelli) 0.196 of the head width (average of 

 five: 0.18; 0.19; 0.2; 0.18; 0.23) ; parafrontals clothed with fine black 

 liairs; median stripe blackish, narrowed behind but distinctly wider 

 than one parafrontal before triangle; ©cellars present, the triangle 

 thickly covered with erect black hairs; inner verticals moderately 

 strong, outer ones about equal the postocellars in size; no orbitals; 

 uppermost frontals reduced in size and stopping before triangle, the 

 rows divergent below and extending to base of third antennal joint; 

 sides of face silvery, moderately haired on inner margins; antennae 

 black, base of third joint obscurely reddish, hardly twice the length of 

 second; arista longer than antennae, slender to base, penultimate 

 joint as broad as long; cheeks gray pollinose on red ground color, 

 thickly covered with fine short black hairs, about one-seventh the eye 

 height; palpi yellow more or less infuscated basally, beset with 

 numerous black hairs to tip ; beard wholly pale or whitish. 



Thorax black, gray pollinose; mesonotum with four widely sepa- 

 rated and very distinct black stripes in front and five behind the 

 suture; scutellum red, sprinkled with whitish-gray pollen; calypters 

 opaque, white. 



Abdomen black, the sides and apex reddish; last three segments 

 largely covered with changeable grayish-white pollen, which on base 

 of fourth segment is interrupted by four reflecting spots that change 

 from light to dark in opposite angles; a narrow median stripe ap- 

 ])arent, widening to a roundish spot near base of second segment ; first 

 segment without median marginal bristles; second with or without 

 one pair; third with a row of about 12, stout; fourth entirely covered 

 with erect bristly hairs and bearing irregular rows of rather weak 

 bristles near apex; hairs on intermediate segments depressed; venter 



