INVESTIGATIONS ON THE MUTILLID WASPS 285 



with black hairs, except at the apical margin with a wide fringe 

 of fulvous pubescence; tergites 3-6 deeply and distinctly punctate, 

 clothed with long, fulvous pubescence; apical tergite smooth and 

 shining, with a narrow fringe of long, fulvous pubescence at the 

 basal margin; second sternite with well separated, coarse, elongate 

 punctures, except at the apical margin the punctures small and 

 confluent, a large pit densely filled with fine hairs occupying the 

 median area; sternites 3-6 punctate at the apical margins; sternites 

 2-6 with a fringe of long pubescence at the apical margins, the 

 fringes black except for a few long, fulvous hairs on the lateral part 

 of each margin ; last sternite irregularly punctate on the basal two- 

 thirds, the apical third smooth and shining, prolonged medially into 

 a prominent tooth. 



Legs black, clothed with long black hairs. 



Wings dark fulignous; veins r-m and Rg approximate on vein r. 



HoJotype.—Male, Cat. No. 40751, U.S.N.M., Chisos Mountains, 

 Brewster County, Texas, June 10-12, 1908 (Mitchell and Cushman). 



Paratypes. — Male, Chisos Mountains, Brewster County, Texas. 

 June 10-12, 1908 (Mitchell and Cushman) ; male, Torreon, Coahuila. 

 Mexico (Wickham) ; male, Langtry, Texas, May 17, 1918 (J. C. 

 Bradley). Paratypes in collections of the University of Minnesota, 

 Cornell University, and the author. 



This species may be recognized at once by the following characters: 

 Second abdominal sternite with a large median pit ; pronotum emar- 

 ginate medially on the cephalic margin; last tergite without an apical 

 fringe of hairs; and fulvous pubescence of second tergite covering 

 only the apical margin. 



129. DASYMUTILLA POLIOTHRIX, new species 



Plate 4, fig. 29 



Male. — Head and thorax black, clothed with silvery gray pubes- 

 cence, except the mesonotum with very dark ferruginous, almost 

 blackish pubescence ; abdomen pale ferruginous, except the first seg- 

 ment very dark ferruginous, clothed throughout with golden yellow 

 pubescence; second abdominal sternite with a median pit filled with 

 hairs ; legs dark, clothed with grayish pubescence. Length, 9 mm. 



Head black, clothed throughout with erect and appressed, silvery 

 gray pubescence ; mandibles acute at the apex, apparently unidentate 

 within near the apex; clypeus feebly bidentate medially at the an- 

 terior margin ; disk of clypeus densely punctate ; bases of mandibles, 

 and clypeus throughout clothed with long, silvery gray pubescence; 

 scape distinctly bicarinate beneath, strongly and closely punctured 

 above; flagellum black above, ferruginous beneath; first segment of 

 flagellum about three-fourths the length of the second; antennal 



