428 [Junk 



with piceous, not so suddenly prominent and the upper surface is more 

 rounded and not tuberculate. Length 4 lines; expanse of wings 7 lines. 

 Fourteen specimens. This may be the % of 31. occidentals. A spe- 

 cimen in the collection of the Society from Texas, differs only by hav- 

 ing both nodes of the abdomen blackish. 



Fam. MUTILLID.E. 



Genus MUTILLA, Linn. 



1. Opaque species* 



a. — Head and thorax entirely black ; abdomen more or less reddish. 



I. Mutilla Orcus, n. sp. 

 Large, black ; abdomen above, except base, rufo-ferruginous. 



Female. — Deep black, with coarse black pubescence, and large deep 

 punctures; head not wider than the thorax; eyes small, round, entire, 

 very convex and polished; antennae piceous-black at base, the flagellum 

 brownish and sericeous. Thorax slightly narrowed behind and ab- 

 ruptly truncate ; the excavations on the sides, for the reception of the 

 legs, are smooth and shining, the posterior truncation less coarsely 

 punctured and somewhat shining. Legs black, with long black pube- 

 scence ; the tibiae with short black spines. Abdomen large, ovate, 

 coarsely punctured, black ; most of the large basal segment and all the 

 remaining segments above, clothed with a long, dense, rufo-ferruginous 

 pubescence ; the node and the base and sides of the large basal seg- 

 ment, as well as the venter, clothed with black pubescence ; the large 

 ventral segment is sparsely pubescent and shining ; in one specimen 

 the lateral apical fringe of the ventral segments is reddish; the node 

 or small basal segment is rather small, circular at tip, narrowed towards 

 the base, and depressed above, with a short stout tubercle on each side 

 at extreme base. Length 9 — 9 J lines. 



j/ a / e . — Elongate; colored similar to the 9 , but is much less coarsely 

 punctured, and the antennae much longer ; the metathorax is large and 

 rounded behind, covered with dense, rather coarse punctures, and 

 clothed, rather sparsely, with long black pubescence. Wings ample, 

 blackish, paler at tips; marginal cell short, not exceeding the tip of 



* The abdomen of some of the male species is more or less shining, especially 

 of M. hexagona Say, but the thorax is always more or less opaque, and roughly 

 sculptured and hairy. In the next division— Smooth, shining species— I have 

 placed those species which are distinguished by their smooth, shining, unicol- 

 orous appearance, their form mostly long and slender, their abdomen petiolate, 

 and their wings hyaline or slightly clouded; the females of the species belong- 

 ing to this last division are unknown to me. 



