INVESTIGATIONS ON THE MUTILLID WASPS 217 



the punctures are small; second sternite with a small, basal median 

 pit, densely filled with hairs; sternites 3-6 with fine scattered punc- 

 tures near their apical margins; ultimate sternite glabrous, impunc- 

 tate on apical third, densely punctate elsewhere. 



Legs dark ferruginous, sparsely clothed with pale pubescence; 

 calcaria dark ferruginous. 



Wings dark fuliginous ; cell 2nd R^ + Rg squarely truncate at the 

 apex; cell R4 indistinct; vein Mo+j received by cell R5 at one-fourth 

 the distance from the base to the apex; veins r-m and Rg widely 

 separated on vein r. 



Holotype. — Male, Nogales, Arizona, July 20, 1903 (Oslar), in col- 

 lection of Cornell University (758.1). 



Paratype. — Male, Nogales, Arizona, July 20, 1903 (Oslar), in col- 

 lection of University of Minnesota. 



This species is related to monticoJa^ GaiieUci^ and macilenta. It 

 closely resembles monticola but the apical abdominal segments are 

 blackish, the mesonotum is clothed with very dark pubescence, the 

 tegulae are glabrous and impunctate for the most part, and the disk 

 of the second tergite is yellow. The characters given in the key 

 will separate the two. The genitalia are very similar to those of 

 monticola and are therefore not figured. 



87. DASYMUTILLA ARCANA, new species 



Male. — Black, the second segment of the abdomen entirely fer- 

 ruginous; apical segments of abdomen above clothed with sparse, 

 grayish pubescence, the remainder of the body entirely with black 

 pubescence; second sternite simple, without a median pit or other 

 modification ; length, 8 mm. 



Head black, sparsely clothed with long, erect, black pubescence; 

 mandibles acute at the apex, bidentate subapically within; anterior 

 margin of clypeus distinctly bidentate medially; clypeus densely 

 punctate; scape with a single longitudinal carina beneath, closely 

 punctured and clothed with coarse, erect, black hairs; first segment 

 of fiagellum slightly shorter than the second (measured dorsally) ; 

 antennal scrobes not carinate above; front and vertex with large, 

 contiguous punctures; genae with small, contiguous punctures; occi- 

 put excavated laterally each side at the posterior margin; relative 

 widths of head and thorax, 5-5.5. 



Thorax black, sparsely clothed with long, erect, black pubescence; 

 cephalic face of pronotum punctured laterally, glabrous, impunctate, 

 and distinctly emarginated medially, not rounded evenly into the 

 dorsum ; dorsum of pronotum, mesonotum, and scutellum witli large, 

 dense, more or less confluent punctures; tegulae with scattered 

 setigerous punctures throughout; propleura wdth large, contiguous 



