248 CHARLES A. BLAKE. 



wings fuliginous, mafginal cell short, truncate at tip, three distinct submar- 

 ginal cells, first longer than the marginal, the second subquadrate, receiving 

 the first recurrent nervure near the base, the third, pentagonal, extending 

 beyond the marginal; tegulse large; legs black, clothed with black hairs j 

 abdomen ovate, basal segment coarsely punctured, clothed with erect black 

 hairs, second more moderately punctured; under side black. Length 16 mm. 



The 9 differs in having the sculpture of thorax much coarser, and the 

 pubescence somewhat paler. Length 12 mm. 



Hah. — Nevada, (Morrison). This species closely resembles aureola 

 Cress., but may be distinguished by the smaller size of the head. 



Mntilla auraria. — 9- — Black, head rounded, densely clothed on vertex 

 with golden pubescence, cheeks testaceous, coarsely punctured; antennse fusco- 

 testaceous, flagellum slightly pruinose; mouth clothed with long white hairs; 

 eyes round, polished; thorax ovate, narrowed posteriorly, densely clothed with 

 golden pubescence; legs blackish- fuscous, tarsi, spines, and calcaria, testa- 

 ceous; abdomen ovate, clothed with golden pubescence, more dense on apical 

 segments; ventral surface black, thinly clothed with long white hairs, mar- 

 gins of apical segments densely fringed with pale golden pubescence. Length 

 12 mm. 



Hah. — Nevada, (Morrison). 



Iflutilla rntilans. — 9- — Entire insect bright castaneous; head quadrate, 

 wider than thorax, posterior angles rounded, polished, covered with exceed- 

 ingly minute punctures; eyes small, ovate and finely reticulate; antenuEe 

 somewhat pruinose; prothorax smooth, prominent, meso- and metathorax 

 minutely punctured, the latter obliquely truncate, and having on each side 

 a small tubercle; legs slender, tibiae armed with a row of minute spines; 

 abdomen polished, ovate, short, apical margin of basal segment black, second 

 segment with two subquadrate white spots on the disc, fifth honey-yellow, apex 

 black. Length 7 mm. 



Hah. — California. This species differs from all others known to 

 me by the entire absence of pubescence. 



Mutilla Gabbii. — 9. — Black; head subquadrate, as wide as thorax, 

 posterior angles rounded, densely rugose, sparsely clothed with erect black 

 hairs; above the eyes on vertex are two ovate spots of appressed pale golden 

 pubescence, cheeks prominent, coarsely, confluently punctured; mandibles 

 black, mouth clothed with pale yellowish hairs; scape of antennse clothed 

 with pale golden pubescence, flagellum slightly pruinose; eyes prominent, 

 round, polished; thorax subquadrate, narrowed posteriorly, densely rugose, 

 anterior angles of prothorax armed with a short tooth; disc of mesothorax 

 bearing a transverse band of pale golden pubescence, anterior angles produced 

 into acute teeth, flanks deeply excavate, filled with pale pubescence below, 

 above which they are polished; metathorax roundly truncate, with an obtuse 

 tooth on each side anteriorly, disc having on each side an elongate- ovate stripe 

 of pale golden pubescence; legs clothed with pale yellowish hairs, calcaria 

 pale; abdomen elongate-ovate, basal segment having two lateral patches of 

 pale golden pubescence, second finely rugose, the dorsal surface bearing numer- 

 ous minute, longitudinal, parallel carinse, on the disc are two round yellow 

 spots, and two lateral stripes, thinly clothed with pale golden pubescence; 



