INVESTIGATIONS ON THE MUTILLID WASPS 281 



larger and more prominent than those of the other members of the 

 genus. Nocturna is similar to arenivaga in general color pattern 

 but differs in the color of the pubescence, in the relative widths of 

 head and thorax, and other characters. 



Group SUBHYALINA 



Males with the eyes and ocelli unusually large; anterior margin 

 of pronotum emarginate medially; first segment of the abdomen 

 nodose; second abdominal sternite without a median pit densely 

 filled with hairs; wings light fuliginous to subhyaline. Possibly 

 the males of the species in the preceding group. 



126. DASYMUTILLA SUBHYALINA, new species 



Plate 4, fig. 31 



Male. — Black, with long, white pubescence on the head, thorax 

 and abdomen; eyes and ocelli abnormally large; wings subhyaline; 

 length, 10 mm. 



Head black; mandibles acuminate at the apex, bidentate within 

 subapically, clypeus bidentate on the apical margin, with small con- 

 fluent punctures; scape clothed with sparse, dark, coarse hairs; first 

 segment of flagellum slightly shorter than the second; antennal 

 scrobes distinctly carinate above; eyes abnormally large and promi- 

 nent, occupying the whole side of the head; ocelli abnormally large 

 and prominent, about twice the usual size ; front with moderate deep, 

 confluent punctures; the vertex and genae with shallow, separated 

 pimctures; front and vertex sparsely clothed with long, white, erect 

 pubescence; genae sparsely clothed with black pubescence; relative 

 widths of head and thorax, 6-7. 



Thorax black, pronotum, mesonotum, and scutellum with mod- 

 erate, close, confluent punctures; the pronotum, mesonotum, scutel- 

 lum, and metanotum clothed with long, white, erect pubescence; 

 propleura with scattered punctures, clothed with sparse black 

 2:)ubescence ; mesopleura with large, shallow, more or less confluent 

 punctures, rather sparsely punctate near the anterior margin, sparsely 

 clothed with black pubescence ; metapleura glabrous, a few scattered 

 punctures ventrally, very sparsely clothed with black pubescence; 

 propodeum broadly and deeply reticulate throughout; tegulae glab- 

 rous, scattered punctures along the basal and inner lateral margins, 

 these same margins with sparse, white pubescence. 



Abdomen black; first segment distinctly nodose; first tergite with 

 coarse, confluent punctures, clothed with sparse, erect, black pubes- 

 cence; second tergite coarsely, confluently punctate throughout, 

 clothed with erect, black pubescence, except the apical fifth clothed 

 with long, erect, white pubescence; tergites 3-6 with small, sepa- 



