310. HYMENOPTEEA. 



the calcaria are white ; the tarsal spines fulvous. The radial cellule is moderately wide, 

 and does not reach the apex of the third cubital cellule. The first abscissa of the 

 radius is longer than the apical ; it is straight and oblique, the apical abscissa being 

 rounded. The recurrent nervures are received in the apical third of the cellules. The 

 transverse median nervure is interstitial. 



M. catriona is closely allied to M. herberti ; the latter, however, has the middle of 

 the clypeus only indistinctly raised, the raised part also not becoming wider towards 

 the apex : the petiole shorter and not so sharply oblique at the base ; the space beneath 

 the basal tooth wider and more deeply and widely hollowed; and the pubescence on 

 the thorax less dense and long. 



59. Mutilla blakei. 



Long. 9 millim. rf • 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



Agrees in coloration and clothing with M. herberti, but differs in its smaller size, and 

 also in the following particulars : — The pronotum is not transverse at the base, but 

 rounded ; the petiole is a little longer, and not at all dilated towards the apex ; the 

 third and fourth segments are not more punctured at the base than they are at the 

 apex; the first cubital cellule at the top is hardly wider than it is at the bottom; the 

 third cubital cellule at the top is longer than the space bounded by the first recurrent 

 and the second transverse cubital nervures, wider at the top than at the bottom ; the 

 lower part of the third transverse cubital nervure is not sinuate, but sharply and 

 distinctly geniculate in the middle ; the second recurrent nervure is received shortly 

 before the middle (not close to the apical fourth, as in M. herberti) ; the first transverse 

 cubital nervure is slightly curved, this being also the case with the second ; and the 

 transverse median nervure is not interstitial, but received in front of the transverse 

 basal. Head densely covered with silvery pubescence, the apex of the clypeus broadly 

 rounded. The scape of the antennas sharply keeled on the lower side and covered with 

 long white hair ; the flagellum at the base closely covered with short hair, the rest with 

 a microscopic pile; the third and fourth joints subequal; the apical joint flattened 

 laterally. The thorax wider than the head ; the sides of the pronotum oblique, the 

 base transverse, the apex rounded in the middle ; coarsely punctured and covered with 

 white hair. The mesonotum reticulated and covered with long white hair. The 

 scutellum subconvex, coarsely coriaceous, and covered all over with long white hair. 

 The median segment reticulated, densely covered with silvery hair. The metapleurse 

 reticulated at the base and apex. The first ventral segment at the base projects into a 

 large, blunt tooth ; the sides have longitudinal keels. The four apical segments of the 

 abdomen are keeled down the middle and are covered with long white hair. 



