438 [June 



appressed, golden-sericeous pubescence, on the basal third a large, quad- 

 rate, pale fuscous, central spot, and another smaller one on each side, 

 all connected at base by a narrow transverse band, the apex with a 

 broad transverse band of the same color; the remaining segments above 

 and beneath with a dense fringe of long silvery-ochraceous or cinereous 

 pubescence ; the node or small basal segment is shaped like that of the 

 preceding species, but less broad, its apical margin is pale fuscous. 

 Length 5 lines. 



Two specimens. This pretty species is easily recognized by the large 

 ochraceous head, and the ornamentation of the large basal segment of 

 the abdomen. It has a close ally in M. connectens Cresson, (Proc. Ent. 

 Soc. Philad. iv, p. 387), from Lower California, which diifers princi- 

 pally by the second segment of the abdomen having two large fuscous 

 spots, one on the basal middle and the other on the apical middle, both 

 connected by a short narrow fuscous line. 



e. — Head and thorax red : abdomen above, black and cinereous. 



17. Mutilla ornativentris, n. sp. 



Rufous: abdomen above blackish, with spots or bands of silvery-cinereous 

 pubescence ; head transverse, broader than thorax, the latter narrow, elongate 

 and parallel. 



Female. — Rufous, very densely punctured ; head transverse, not 

 quadrate, broader than the thorax ; the mouth with long ochraceous 

 pubescence; eyes moderate, ovate, entire; mandibles, blackish; an- 

 tennae blackish, sericeous, the three or four basal joints rufous. Thorax 

 elongate, narrow, somewhat rounded in front, the sides subparallel, a 

 little strangulated about the middle, and again widened posteriorly, the 

 sides and behind abrupt ; upper surface with a short fuscous pubes- 

 cence, the sides with a very short, fine, dense cinereous pile. Legs 

 rufous, with ochraceous pubescence ; tips of the femora, most of the 

 tibia? and the tarsi, fuscous. Abdomen elongate, ovate, much narrowed 

 to the apex, blackish above, reddish beneath ; all the segments with a 

 broad apical baud of dense silvery-cinereous pubescence, the anterior 

 middle of which is more or less sinuate or emarginate; large basal 

 segment with a large patch of silvery-sericeous pubescence, sometimes 

 obsolete, on each side at base ; the apical segments above are some- 

 times tinged with reddish, and in one specimen the large basal segment 

 above is tinged with reddish ; the ventral segments have an apical 

 fringe of silvery-cinereous pubescence. Length 4 J — 5 lines. 



Three specimens. Easily distinguished by the narrow, subparallel 

 thorax, and the ornamentation of the abdomen. 



