430 [June 



One specimen. Closely allied to M. fenestrata St. Farg. (the sup- 

 posed % of M. ferrugata Fab.) but is distinct. 



b. — Head and thorax black with greyish pubescence; abdomen more or less 

 reddish. 



3. Mutilla hexagona, Say. 



Mutilla hexagona. Say, Bost. Journ. Nat. Hist, i, p. 295. 

 Three % specimens. The scape of the antennae has a dense tuft of 

 silvery-sericeous pubescence, and the segments of the abdomen are shin- 

 ing and clothed towards the apex with fuscous pubescence. This spe- 

 cies occurs also in the Atlantic States, and varies much in size. In 

 some specimens the black pubescence of the thorax predominates over 

 the grey. 



l. Mutilla monticola, n. sp. 



Black, head and thorax above with greyish pubescence: wings blackish, 

 paler about the middle ; abdomen subglobose, ferruginous, the segments with 

 an apical fringe of blackish pubescence. 



Male. — Black, closely and deeply punctured; head and thorax 

 clothed above with long, dense, greyish-ochraceous pubescence, beneath 

 with black pubescence; eyes small, round, entire and very convex; 

 antennae black at base, the flagellum brown-sericeous ; metathorax 

 rounded, rather abrupt behind, reticulate with coarse punctures and 

 clothed with black pubescence. Wings blackish, paler about the mid- 

 dle ; marginal cell short, truncate at tip, not exceeding the tip of the 

 third subinarginal cell ; three submarginal cells, the first as long as the 

 marginal, the second shorter, much narrowed towards the marginal, 

 receiving the first recurrent nervure one-fourth from the base, the third 

 submarginal subobsoletely defined, subtriangular, extending beyond the 

 marginal cell, pointed towards the apex of the wing and much narrowed 

 beneath, the apical nervure confluent with the second recurrent ner- 

 vure ; a curved subhyaline line commences at the stigma and runs 

 through the first and second submarginal cells, and at the tip of the 

 latter it becomes confluent with a spot on the upper margin of the 

 second discoidal cell. Legs piceous-black, with black pubescence, the 

 tibiae and tarsi more or less tinged with brownish. Abdomen short, 

 broad-ovate or subglobose, ferruginous or honey-yellow above and be- 

 neath, closely and rather deeply punctured; clothed with blackish 

 pubescence, rather thin on the large basal segment, and dense on the 

 apical margins of all the segments; the apex with a patch of glittering 

 greyish pubescence, the venter also sprinkled with a similar pubescence; 

 the node sometimes blackish, rugose, swollen at tip, with a prominent 

 central carina beneath. Length 4-5 lines; expanse of wings 6J-8 lines. 



Nine specimens. 



