172 Annals Entomological Society of America [Vol. IV, 



sum of each segment clothed with white hairs, anterior part of the 

 dorsum for more than half the length of each segment clothed with 

 black hairs. Hypopygium small and clothed both above and below 

 with rather long silvery white hair, ovipositor black. 



Easily known from other species of its group by its small 

 size and general rather light color as well as by the very small 

 hypopygium which is densely clothed with silvery hairs below 

 as well as above. 



Male type and five other males and females taken near 

 Albuquerque, New Mexico, by J. R. Watson. 



Promachus giganteus n. sp. 



Total length, male 37, female 41, millimeters. Mystax and beard 

 white, hair of the rear of the head white, occipito-orbital bristles mostly 

 black, palpi black, largely with white hairs, but there are some black 

 ones above, antennae black; general color of the thorax reddish brown, 

 mesothoracic dorsum with a rather wide middorsal black stripe which 

 is divided lengthwise by a narrow red interval, on either side is a second 

 black area which is divided by a narrow red space which follows the 

 transverse suture. As the surface of the dorsum of the mesothorax is 

 somewhat denuded in the specimens studied it is likely that the mark- 

 ings described are plainer than would be the case otherwise, scutellum 

 clothed with white hair and with two rows of black bristles near the 

 margin; legs in large part dull reddish and clothed with black bristles 

 and recumbent white hair, tarsi nearly black, femora darkened anteri- 

 orly; wings hyaline, no gray shadow in the first submarginal cell, veins 

 brown and some of them towards the apex very narrowly margined 

 with a nearly obsolete brownish shade. Abdomen as seen from above 

 alternately banded with black and white, the former color usually 

 wider than the latter. The black and white is segmentally arranged, 

 the anterior part of each segment is black with black hair and the pos- 

 terior part is white pollinose with white hair, sides and venter of the 

 abdomen corresponds in color with the posterior parts of the seg- 

 ments. In the male the hypopygium is silvery pilose above and the 

 posterior ventral margin of the eighth abdominal segment is furnished 

 with a thickly placed row of white hairs. 



The species cannot be mistaken among described North 

 American species on account of its very large size. 



The type female and one male taken at El Paso, Texas, by 

 D. L. Crawford, and received from Carl F. Baker, of Pomona 

 College, Claremont, California. 



