MUTILLA. 215 



legs with black pubescence, on the tibiae and tarsi it is mixed with 

 white. The basal segment of the abdomen very short, forming a 

 flattened scale, the second segment with two ovate maculae at the 

 base, and two that are rather larger towards its apical margin ; 

 the third, fourth, and fifth segments fringed with white pubescence 

 at their extreme lateral margins ; the apex with white pubescence. 



Hah. Venezuela. 



77. Mutilla perfidiosa. 



Female. Length 5| lines. — Black ; the abdomen with two large 

 pale ferruginous maculae. Head quite as wide as the thorax, rather 

 finely rugose ; a patch of bright silvery pubescence on the vertex ; 

 the tubercles at the base of the antennae, the clypeus, and man- 

 dibles ferruginous, the latter black at their tips ; the flagellum, 

 except two or three of the basal joints, fulvous beneath. Thorax 

 oblong-quadrate, rugose, with the sides slightly rounded anteriorly, 

 then abruptly narrowed, the sides thence parallel to the apex ; the 

 metathoras truncate, the truncation with silvery-white pubescence 

 at its lateral margins ; a silvery spot on the sides above the inter- 

 mediate and posterior coxse ; the legs with thin white pubescence, 

 the apical joints of the tarsi obscurely ferruginous. The basal seg- 

 ment of the abdomen with two silvery-white pubescent spots ; the 

 third and following segments with white pubescence laterally. 



Hob. Venezuela. 



78. Mutilla sociata. 



Female. Length 9 lines. — Black, and clothed with black and silvery- 

 white pubescence. Head not quite as wide as the thorax ; the 

 vertex with white pubescence ; the face and cheeks with scattered 

 white hairs ; the scape with white pubescence. The lateral angles 

 of the prothorax acute, below the angles a short acute tooth ; the 

 thorax with a large tooth about midway at its lateral margins ; a 

 curved band of white pubescence crosses the thorax about the 

 middle, and the metathorax has on each side a longitudinal stripe 

 of the same. The margins of the basal segment of the abdomen 

 with a broad band of bright white pubescence, interrupted in the 

 middle above ; the segment has also a transverse crenulated acute 

 carina before the aj)ical one ; the second segment with two ovate 

 pale maculae; the thii'd and following segments with short pale 

 pubescence, more or less interrupted in the middle. 



Hah. Ecuador. 



This species resembles M. insignis both in size and general mark- 

 ings, but it differs in having black antennae, in M. insignis they 

 are yellow ; the head is proportionately considerably smaller, and 

 the metathorax is longer and narrower. 



