348 HTMENOPTEEA. 



Antennae longer than the body, microscopically pilose, tapering distinctly towards the 

 apex. Head densely covered with longish white hair, except on the vertex ; front but 

 little depressed ; a very deep and moderately wide, shining furrow running down to the 

 antenna? and a little below them ; the sides bordering the furrow semiopaque, obliquely 

 striated. The breast, pleurae, and metanotum sparsely covered with longish white hair ; 

 the metanotum with a rather abrupt, sharp slope. Petiole semiperpendicular ; the keel 

 separating the furrows sharply erect, large, the inner furrow the widest and with a few 

 stout transverse striations ; a longitudinal keel on the apical part of the central space, 

 which is aciculated on each side of the keel. Second segment depressed laterally y 

 coarsely longitudinally striated ; a stout keel down the centre ; suturiform articulation 

 broad, deep, the upper fork much narrower and shallower than the lower, coarsely lon- 

 gitudinally striated to the apex ; second furrow narrower, deep ; the part behind this 

 smooth, shining, impunctate, and much lower than the apex of the preceding segment ; 

 third furrow nearly as wide and deep as the second, but shorter, becoming united to the 

 segment a little beyond the middle ; the apex of the segment raised, so that there is a 

 furrow behind it. Wings smoky, the apical third blackish ; cubital cellules wide, the 

 second much shorter than the third ; the recurrent nervure almost interstitial. Man- 

 dibles reddish, the tips black. 



Differs from I. aztecus in being larger and stouter ; the antennae stouter ; the abdomen 

 wider and much more strongly striated ; the third segment striated throughout ; the 

 suturiform articulation also striated at the sides ; the ovipositor longer ; and the cubital 

 cellules wider. 



Ss 28. Iphiaulax aztecus. (Tab. XIV. fig. 10, ? .) 



Bjifo-testaceus ; capite, antennis, prosterno pedibusque, nigris ; apice abdominis segmento 2° vix striolato ; ali& 



fumatis, stigmate testaceo. <j? . 

 Long. 8 millim. ; terebra 4 millim. 



Eab. Mexico, Orizaba (Bilimelc). 



Antennae longer than the body, tapering towards the apex ; third joint about one 

 fourth longer than the succeeding one ; microscopically pilose. Face and the sides of 

 the head densely covered with long white hair ; front scarcely depressed above the 

 antennae, semiopaque, aciculated ; a deep furrow leading down from the ocelli. Breast^ 

 sides, and metathorax covered sparsely with longish pale hair ; metanotum with a gradual 

 slope. Inner furrow of the petiole wide, moderately deep, closely punctured ; the outer 

 furrow much narrower and somewhat deeper. Second segment with a few coarse Ion 

 gitudinal striae at the base ; two oblique deep depressions laterally, and a stout kee± 

 down the centre ; first transverse furrow wide, deep, strongly longitudinally striated, the 

 basal fork narrower than the apical one ; second furrow narrower, but as deep, stoutly 

 crenulated ; third furrow obsolete. Wings slightly fuscous ; stigma testaceous on the 

 lower side ; the recurrent nervure interstitial. 



