274 HJMENOPTEKA. 



]bears some white hairs ; the third joint is twice the length of the fourth. Thorax 

 coarsely punctured, the sides nearly straight; the apex of the pronotum semi-transverse ; 

 the median segment with a rounded rather sharp slope. Above, the thorax bears long 

 hairs, which are fuscous in front, on the median segment pale. The impunctate meso- 

 pleurse are covered with a short silvery pubescence. The breast, the part immediately 

 over the coxae, and an elongated broad mark on the median segment, black. The basal 

 segment of the abdomen becomes gradually dilated to the apex ; it is smooth and 

 impunctate, and bears some long pale hairs, and on the apex there is a band of silvery 

 pubescence. The second and following segments are alutaceous, and sparsely covered 

 with long fuscous hairs ; on the base of the second segment are two white lines, which 

 reach a little beyond the middle, and also a white band, dilated in the centre ; on each 

 side of the following segments is a broad mark, the three forming a continuous band. 

 The pygidium is coarsely alutaceous, densely fringed laterally with long fulvous hair. 

 The second ventral segment bears widely separated punctures ; the other segments are 

 more closely and finely punctured, and are fringed with white hairs. The legs are 

 covered with white hair; the knees broadly and the coxse are black ; the tibial spines 

 are long, sharp, and fulvous. 



This species resembles M . prominens, but the markings on the abdomen are white 

 (not golden) ; the apex of the median segment has a rounded slope (not sharply 

 oblique) ; the breast and a longish mark on the median segment are black ; the 

 pygidium is not striolate ; the antennas are ferruginous, except at the apex ; and the 

 ventral surface of the abdomen is entirely black. 



ff Legs black. (Species 17-19.) 



17. Mutilla oajaca. 



Mutilla oajaca, Blake, Trans. Am. Ent. Soc. iii. p. 228, fig. ( $ & $ ) 1 , and xiii. p. 196 2 ; Cresson, 

 in Wheeler's Rep. Expl. and Surv. west of 100th Merid., Zool. p. 709 3 . 



Sab. Noeth America, Colorado 3 . — Mexico (Sumichrast *). 



This species is larger than either of our two others of this section with black legs, 

 the female being 13 millim. in length. Judging from Blake's figure ( $ ), it has the 

 head wider compared to the thorax than in M . hbgei ; and from both it differs in having 

 the marks and bands on the abdomen golden, while with our species they are clear 

 silvery- white. Blake states that sometimes the head may be ferruginous. 



The male is described ; it is black, with the abdomen ferruginous and the wings 

 blackish. 



18. Mutilla hogei. (Tab. XIII. fig. 18, $ .) 



Nigra ; thorace ferrugineo ; abdomine subtus femoribusque posterioribus rufis ; abdominis maculis albis. $ . 

 Long. 11 millim. 



Sab. Mexico, Cordova (Soge). 



