INVESTIGATIONS ON THE MUTILLID WASPS 279 



recumbent yellow pubescence, except the pubescence of the sides, and 

 the apical fringe black; the apical margin of the second tergite 

 slightly depressed, especially at the sides; tergites 3-5 with shallow, 

 indistinct punctures, clothed with long, dense, erect, black pubes- 

 cence; pygidial area longitudinally rugose; first sternite with a 

 sharp median longitudinal keel on the anterior half ; lateral margins 

 of second sternite foveate, more strongly so towards the posterior 

 margin, the anterior half of the sternite indistinctly punctured, the 

 disk of the posterior half with large, separated punctures; apical 

 margin of second sternite depressed; sternites 3-5 with shallow, 

 more or less confluent punctures ; sternites 2-5 with a thick fringe of 

 long, black pubescence. 



Legs black, clothed with long, black hairs. 



Holotype. — Female, Coyote Wells, Colorado Desert. California, 

 August 11, 1914 (J. C. Bradley), in collection of Cornell University, 

 No. 760.1. 



Paratypes. — 3 females, Wellton, Yuma County, Arizona, August 

 9, 1917 (J. Bequaert) ; female, Yuma, Arizona, summer, 1900 (H. 

 Brown) ; female, Yuma, Arizona, 1901 (H. Brown) ; 2 females. 

 Death Valley, California, April, 1891; female, Panamint Valley, 

 California, April, 1891; female, Imperial County, California, 1913 

 (Essig). Paratypes in collections of United States National 

 Museum, University of Minnesota, J. Bequaert, California State 

 Insectary, and the author. 



This species is almost identical with scitula in superficial appear- 

 ance. The very large eyes, sculpture of the genae and pygidium 

 and the more extended yellow pubescence of the second abdominal 

 tergite serve to distinguish it from that species. The shape of 

 the head in this species is quite different from that in scitula due 

 to the great development in the size of the eyes. Arenivaga is a 

 manuscript name of Dr. J. C. Bradley. 



125. DASYMUTILLA NOCTURNA, new species 



Female. — Very dark mahogany red, almost black; eyes unusually 

 large; front, vertex, thorax above and second tergite of abdomen 

 clothed with long, white pubescence; remainder with black pubes- 

 cence; length, 13 mm. 



Head very dark mahogany red ; mandibles acuminate at the apex, 

 probably unidentate within but mandibles are worn so that this is 

 not apparent ; clypeus bidentate medially on the apical margin, with 

 a thick fringe of long, dark hairs ; scape sparsely clothed with coarse 

 dark hairs ; first segment of flagellum slightly shorter than twice its 

 own width at the apex; antennal scrobes strongly carinate above; 

 eyes unusually large and prominent, the distance between the eye 

 55287—28 19 



