ART. 20 REVISION OF THE GENUS WINTHEMIA KEINHAED 7 



17. Cheek in profile almost linear; front greatly narrowed above 



0.16 of the head width; parafacials inconspicuously haired; 

 first and second abdominal segments usually without median 

 marginals; mid tibiae with one bristle on outer front side 

 near middle; abdominal hairs fine and depressed (North 



America, widespread) rufopicta Bigot (p. 31) 



Cheek in profile at least one-eighth the eye height ; front ap- 

 proximating one-half the eye width ; parafacials thickly 

 haired ; mid tibiae usually with two bristles on outer front 

 side; abdominal hairs rather coarse and often erect or sub- 

 erect (Europe, New England to New Mexico, and Washing- 

 ton) quadripustulata Fabricius (p. 14) 



18. Intermediate joints of front tarsi conspicuously flattened and 



much broader than long 19 



Front tarsi ordinary 20 



19. Palpi black ; front exceeding one-half the width of eye ; abdomi- 



nal segments two and three with defined poUinose cross bands 

 on basal half, the remainder shining black (Central and 



South America) sig-nata, new species (p. 51) 



Palpi yellow; front greatly narrowed above and distinctly less 

 than one-half the width of eye ; intermediate abdominal seg- 

 ments pollinose or subpollinose to the hind margins (Georgia, 

 Cuba) okefenokeensis Smith (p. 52) 



20. Outer genital forceps subacute at apex or terminating in a 



curved hook 21 



Outer forceps truncate or symmetrically rounded at apex 23 



21. Ocellar bristles present 22 



Ocellars absent; inner and outer genital forceps equal in length ; 



the latter often with numerous long black hairs on outer side 



(Central and South America) mima, new species (p. 37) 



22. Outer genital forceps tapering from base to tip; abdomen with 



the patches of matted hairs confined to the venter of third 



segment (Arizona) montana, new si)ecies (p. 36) 



Outer forceps narrowest at middle, the anterior extremity 

 broadly produced ; the patches of matted hairs on venter of 

 third abdominal segment extending without interruption on 

 base of fourth (Argentina) singularis, new species (p. 38) 



23. Orbital bristles absent, claws and pulvilli elongate 24 



Oi'bitals present; claws and pulvilli minute (Mexico, Central 



and South America) xanthocera Wiedemann (p. 44) 



24. Frontals in single rows with only fine hairs and small bristles outside 25 



Frontal bristles bordered by a partial secondary row outside of 



the main rows below (Bolivia) analis Macquart (p. 47) 



25. Uppermost frontal bristles stout, reclinate, situated almost on 



line with anterior ocellus 26 



Uppermost frontals small, situated at or before apex of ocf'llar 

 triangle 27 



26. Thoracic stripes fused, appearing as two broad black bands; 



face pale grayish-white (Mexico, Central and South Amer- 

 ica) pinguis Fabricius (p. 49) 



Thoracic stripes broad and very distinctly separated on entire 

 length; face grayish yellow pollinose (Cuba) sexualis CuTran (p. 47) 



