328 HYMENOPTEKA. 



black patch. Metathorax with a gradual slope to the apex. Abdomen sessile ; petiole 

 shining, impunctate, the raised part 3-angled, transverse at the apex, narrowed to a 

 point at the base, a straight keel running down the side, the furrow on the inner side 

 of this broad (there is none on the outer) ; segments 2-4 obscurely punctured and reti- 

 culated, the apical ones shining and impunctate ; a deep, obscurely reticulated furrow 

 at the apex of the second segment. 



Almost similar in coloration to B. comparatus, but easily known from that species by 

 the much shorter abdomen, the less excavated front, and the longitudinally striolated 

 suturiform articulation. 



iii. Abdomen striated. 

 The group of B. montivagus. 



Abdomen strongly longitudinally striated, except at the apex; longer than the head and 

 thorax united; central part of the petiole rounded and narrowed behind; an 

 oblique depression on each side of the second segment, a sharp Jceel down the centre ; 

 suturiform articulation transverse, wide, deep, strongly longitudinally striated. 

 Eyes oblong, just reaching to the apex of the clypeus. 



27. Bracon montivagus. (Tab. XIII. fig. 16.) 



Bufus ; antennis pedibusque nigris ; coxis posterioribus femoribusque posticis rufis ; articulatione suturiformi 



recta ; alis fuliginosis, stigmate nigro ; terebra quam corpus longiore. 

 Long. 10 millim. ; terebra 10-5 millim. 



Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 



Antennae a little shorter (9 millim. in length) than the body ; of nearly uniform 

 thickness; the flagellum covered with a very short microscopic pile, the scape more 

 shining and sparsely clothed with longish hair ; third joint nearly one fourth longer than 

 the fourth. Head shining, the face almost impunctate, the front not much depressed 

 above the antennae, the central furrow indistinct ; ocelli surrounded by a moderately 

 deep furrow ; apex of the mandibles and palpi black. Thorax shining, impunctate, 

 the metanotum irregularly reticulated ; scutellum triangular, the sides broadly, and not 

 very distinctly, keeled. Petiole longitudinally reticulated and striated, the broad inner 

 furrow transversely striated, the outer furrow equally broad and similarly striated and 

 perpendicular. Second segment coarsely longitudinally striated, most strongly at the 

 base, where there is a small triangular, impunctate, shining space ; an oblique depression 

 on each side at the base ; the third and fourth segments longitudinally striated, but 

 not so coarsely as the second, their apices shining, impunctate, as are also the apical 

 segments; the transverse furrow deep, wide. The recurrent nervure is interstitial; 

 the cubital nervure from the second transverse cubital cellule curves obliquely down- 

 wards, thus making the third cubital cellule rather wide. 



