204 CHARLES A. BLAKE. 



JI ut ilia thoracica n. sp. 



Female. — Head subquadrate, posterior angles rounded, coarsely and confidently 

 punctured, castaneous, somewhat paler on the vertex, sparsely clothed with very 

 short, black hairs; antennse : scape and two basal joints of the flagellum honey 

 yellow, the rest fuscous ; mandibles black at tip ; eyes large, ovate ; thorax elon- 

 gate quadrate, slightly narrowed at middle, prothorax ferruginous, densely punc- 

 tured, and separated from the mesothorax by a deep sulcus, metathorax abruptly 

 truncate, dark ferruginous and coarsely rugose^ sides of mesothorax deeply ex- 

 cavate ; legs testaceous, thinly clothed with a glittering silvery pile ; abdomen 

 ovate, basal segment very large, subglobose, sessile with the second segment, 

 closely punctured, ferruginous, sparsely clothed with short, pale, yellowish pu- 

 bescence, second segment with a broad castaneous band, not extending to the 

 basal and apical margins, remaining segments castaneous, the apical margins 

 fringed with pale golden pubescence ; first, second and third ventral segments 

 ferruginous, shining, finely and remotely punctured, apical margins fringed as 

 above. Length 5-7 mm. 



Hab. — New York. 



Allied to M. peeidiaris Cresson, but may easily be distinguished 

 from that species by the thorax being destitute of the dense, appressed, 

 golden pubescence, and the silvery white apical margin of the basal 

 segment. 



Mutilla rutilans Blake. 



Female. — Entire insect bright castaneous ; head quadrate, wider than thorax, 

 posterior angles rounded, polished, covered with exceedingly minute punctures; 

 eyes small, ovate and finely reticulate ; antenna? somewhat pruinose ; prothorax 

 smooth, prominent, meso- and metathorax minutely punctured, the latter ob- 

 liquely truncate, and having on each side a small tubercle ; legs slender, tibiae 

 armed with a row of minute spines; abdomen polished, ovate, short; apical mar- 

 gin of basal segment black, second segment with two subquadrate white spots on 

 the disc, fifth honey yellow, apex black. Length 7 mm. 



Hab. — California. 



This species differs from all others known to me by the entire ab- 

 sence of pubescence. 



Mutilla sapiens Smith. 



Male. — Black ; the head and thorax coarsely punctured ; the abdomen shining 

 and more finely punctured ; the head covered with white pubescence ; the meta- 

 thorax, the basal segment of the abdomen, and the apical margin of the second 

 segment with a fascia of silvery white pubescence, the basal segment forming a 

 short petiole ; wings hyaline, faintly clouded at their apical margins, the ner- 

 vures black ; the tegulse large, testaceous at their tips ; anterior wings with three 

 submarginal cells ; the eyes emarginate. Length 7 mm. (Smith.) 



Hab. — Mexico, Orizaba. 



Mntilla ordinaria Smith. 



Male. — Head, thorax, legs and basal segment of the abdomen black, the other 

 segments ferruginous ; wings fuscous and more or less hyaline at their base ; the 



