ART. 20 REVISION OF THE GENUS WINTHEMIA RBINHABD 51 



(31) WINTHEMIA SIGNATA, new species 



Plate 1, Figure 10 



Intermediate joints of the front tarsi transversely broadened in 

 male; thoracic stripes fused appearing as two solid black bands to 

 the naked eye; abdomen shining black with defined poliinose cross 

 bands on basal half of segments 2 to 4. 



Male. — Front 0.245 of the head width (average of four) ; para- 

 f rentals gray poliinose, widening raj^idly downward; median stripe 

 brownish black, wider than one parafrontal at the triangle; verticals 

 two pairs; no orbitals; ocellars present, proclinate; frontals de- 

 scending to base of third antennal joint, not much reduced above, 

 the uppermost two or three pairs reclinate; antennae black, third 

 joint hardly exceeding twice the length of second ; arista rather long, 

 only slightly thickened on basal fourth, penultimate joint short; face 

 silvery poliinose, the sides with a few hairs extending dow^nward to 

 the cheeks; the latter faintly pruinose, covered with black hairs, 

 about one-eighth the eye height; vibrissae situated on level with 

 oral margin ; palpi black. 



Thorax black, pleura lightly dusted with gray pollen shining in 

 certain angles: mesonotum with a median and two broader lateral 

 poliinose stripes; scutellum black the apex obscurely reddish, 

 covered with bluish-gray pollen except near base; with the usual 

 three lateral bristles, besides one discal and a small decussate up- 

 turned apical pair; calypters white tinged faintly with yellow. 



Abdomen black in ground color, the sides and apical half of fourth 

 segment reddish ; basal third to half of segments 2 to 4 with dense 

 gray pollen bands, the remainder of the intermediate segments shin- 

 ing black; first segment without median marginals; second usually 

 with one pair (absent in one specimen) ; third with a marginal row 

 of about 10; fourth with a discal row and several irregular rows of 

 smaller bristles before apex, destitute of hairs on basal inargin above; 

 venter with large roundish defined patches of matted glossy-black 

 hairs on third segment, with similar but smaller patches on the 

 fourth segment : hairs on dorsum of intermediate segments depressed. 



Legs black, the intermediate joints of the front tarsi strikingly 

 flattened, about twice as broad as long; mid tibiae with one stout 

 bristle on outer front side near middle; hind tibiae ciliate; claws and 

 pulvilli elongate. 



Wings subhyaline, brownish at base and along costal border: 

 fourth vein arcuate beyond bend reaching costa well before apex of 

 wing; third vein with one or two small bristles at base; costal spine 

 small and inconspicuous. 



Lenjrth. 8.5 to 10 mm. 



