INVESTIGATIONS ON THE MUTILLID WASPS 293 



rugose and without an apical fringe of hairs, occupying the re- 

 mainder of the tergite; carina of first sternite prominent, produced 

 posteriorly to form a tooth, the sternite with large, scattered pun-:- 

 tures ; second sternite with large, distinct punctures, sparser medially, 

 and wih a median area of dense, fine punctures, each of the latter 

 bearing a fine hair; apical margins of sternites 2-6 with small, scat- 

 tered punctures; ultimate sternite punctate and pubescent. 



Legs black, clothed with long, sparse, black pubescence; calcaria 

 black. 



Wings dark fuliginous; cell 2nd R^ + Ro broadly truncate at the 

 apex ; cell R^ almost obsolete ; vein M3+4 received by cell R5 at a little 

 less than one-third the distance from the base to the apex ; veins r-m 

 and Rg approximate, almost touching, on vein r. 



Holotype.—IA^X^, Cat. No. 40754, U.S.N.M., Phoenix, Arizona, 

 July 25, 1917 (W. D. Pierce). 



Pwratyyes.—yi'aX^^ Phoenix, Arizona, August 3, 1917 ; male, Tempe, 

 Arizona, August 5, 1917; male, Florence, Pinal County, Arizona, 

 August 28, 1917; male, Sucaton, Arizona, July 26, 1924 (J. A. Harris, 

 jr.); male, Tucson, Arizona, July 12, 1924 (A. A. Nichol) ; male. 

 Empire, Arizona, July 3, 1924 (A. A. Nichol) ; 4 males. Baboquivaria 

 Mountains, Arizona (F. H. Snow), in collections of the University 

 of Kansas, University of Minnesota, Cornell University, J. Bequaert, 

 and the author. 



Closely related and similar to atHfulva. Readily distinguished 

 from the latter species by the yellow to red pubescence on the head 

 and thorax. The pubescence of the paratypes varies from yellow to 

 red. The length of the paratypes varies from 10-12 mm. The 

 genitalia are identical with those of atHfulva and are therefore not 

 figured. 



The following nine species are known only in the male sex and 

 their relationships are obscure. They are grouped here only for con- 

 venience. All of them have the second abdominal sternite without a 

 median pit densely filled with erect hairs. 



134. DASYMUTILLA ABDITA, new species 



Plate 5, fig. 38 



Mutilla testaceiventris Fox, Trans. Amer. fint. Soc, vol. 25, p. 242, 1899, 



male (part). 



3Iale.— Black, clothed above with reddish-orange pubescence; 



antennal scrobes distinctly carinate above ; first segment of flagellum 



three-fourths the length of the second ; anterior margin of pronotum 



emarginate medially; pygidium without an apical fringe of hairs; 



