240 CHAS. A. BLAKE, 



ceiving the recurrent nervure before the middle, third obsolete. Legs black 

 clothed with black hairs, calcaria pale. Abdomen petiolate, black, closely- 

 punctured, bearing a few erect black hairs; second and following segments 

 dark brown, closely punctured, apical margins clothed with black pubescence, 

 apex bearing a few obscure yellow hairs. Length 4 lines, expanse of wings 6 

 lines. 



Ilab. — Massachusetts. Coll. of Prof. Agassiz. 



50. Matilla gibbosa, Say. Bost. Jour. I, p. 198, 6. 



Male. — Black, thinly clothed with scattered pale hairs, wings fusco-hyaline, 

 marginal cell ovate, abdomen petiolate, shining, finely punctured, eyes round. 

 Length 3i lines, expanse of wings 5 lines. 

 Hab. — Western States. 



51. Mutilla Wilsoni, Cresson, Proc. Ent. Soc. Phil. Vol. IV, p. 112, 



Male. — Black, more or less clothed with silvery-white pubescence, wings hy- 

 aline, with a fuscous cloud at middle and apex, eyes round. Length 4i lines, 

 expanse of wings SJ lines. 

 Hab. — Cuba. 



52. Mutilla azteca, n. sp. 



J-ia/e.^BIack ; head not as wide as the thorax, sub-quadrate, clothed with 

 dense pale golden pubescence; antennae and mandibles black; eyes round, 

 prominent. Thorax robust, narrowed posteriorly, pro- and mesothorax rugose, 

 the former with pale golden pubescence, the latter elevated, metathorax coarse- 

 ly reticulated, abruptly truncate behind. Wings fusco-hyaline, marginal cell 

 short, abruptly truncate at tip, first sub-marginal about as large as marginal, 

 second receiving the first recurrent nervure a little before the middle, third 

 about equal to the second, and extending a little beyond the marginal. Legs 

 black, clothed with whitish hairs, calcaria white. Abdomen elongate ovate, 

 petiole coarsely punctured, clothed with scattered, erect, whitish hairs; second 

 segment rugulose, with a broad band of pale golden pubescence at" the buse, 

 posterior half clothed with black, third and fourth segments clothed with pale 

 golden pubescence, apex black; underside of second segment finely punctured, 

 thinly clothed with pale hairs; margins of ventral segments fringed with pale 

 gfdden pubescence. Length 5i lines, expanse of wings 7i lines. 

 _ Hab. — Mexico. Prof. F. Sumichrast. 



This species is closely allied to Wlhoni, Cresson, but may be distin- 

 guished by the large size of abdomen, and the clothing which is much 

 more dense, and the clouding of the wings which is more suffused, the 

 margins of the fuscous portions in WUsi.ni being sharply define J. 



53. Mutilla melanosoma, n. sp. 



Female. — Deep black, head rounded with narrow lunate band of pale golden 

 pubescence between the eyes; antennre black, scape clothed with fine glittering 

 hairs; eyes round, prominent. Thorax subquadrate, narrowed posteriorly, 

 coarsely reticulated, anterior angles armed with a short tooth; mesothorax 

 with two subovate spots of pale golden pubesence, behind which, on the meta- 

 thorax, are two nari-ow longitudinal lines of the same. Legs black, thinly 

 clothed with glittering white hairs, intermediate and posterior tibiae armed 

 with a row of spines, calcaria white tipped with brown. Abdomen ovate 



