320 HTMENOPTEEA. 



mouth black (the mandibles only being reddish at the base), and the thorax with only a 

 little black on the apex of the metanotum ; but the chief distinction consists in there 

 being a broad keel down the second segment, extending a little beyond the suturiform 

 articulation, and having a depression on either side at the base. 



12. Bracon melanostoma. 



Niger; pronoto, mesothorace basique coxarum anticarum, rufis; abdominis marginibus albidis; alis fuligi- 



nosis. 5 . 

 Long. 9 millim. ; terebra fere 4 millim. 



Hah. Nicaeagua, Chontales (Janson). 



Face rugosely reticulated, with some longitudinal keels ; over each antenna is an oval 

 depression, separated by a broad keel, in the centre of which is a shallow furrow ; the 

 centre of the clypeus dull red; the joints of the palpi dull white at the apex. Petiole 

 deeply excavated at the base, the central part moderately large and surrounded by a wide 

 and deep furrow (but not so wide as the part of the petiole on the outer side of it). 

 Suturiform articulation waved. The third and following segments at the apex, a line 

 along the sides, and the ventral surface in the centre, whitish. Wings long ; the second 

 cubital cellule on both sides shorter than the third ; the recurrent nervure received at a 

 little distance from the first transverse cubital one. Legs stout, the spurs whitish, the 

 femora with some long hairs, the tibiae and tarsi densely pilose. 



Very nearly related to B. erythrostoma, but a little longer ; the ovipositor is shorter, 

 compared to the body; the head (except the mandibles, which are broadly piceous 

 towards the apex) is entirely black, as is also the prosternum ; the abdomen is longer, 

 and is broadly white along the sides ; the suturiform articulation is curved backwards, 

 somewhat sharply at the middle ; the recurrent nervure is received further from the 

 first transverse cubital one ; and the inner furrow of the petiole is broader and deeper, 

 the petiole itself being more developed laterally. 



13. Bracon morrisoni. (Tab. xin. fig. 18.) 



Niger ; mesonoti lobo medio abdomineque rufis, articulatione suturiformi recta ; terebra quam abdomen vix 



longiore ; alis fuscescentibus. $ . 

 Long. 8 millim. ; terebra fere 4 millim. 



Eah. Mexico, Northern Sonora (Morrison). 



Antennae shorter than the thorax and abdomen united ; stout, of nearly uniform 

 thickness throughout, microscopically pilose. Head in front covered with long silvery- 

 white hair ; the orbits externally narrowly red ; the face coarsely punctured ; the front 

 opaque and punctured laterally ; the centre shining, impunctate, and slightly depressed, 

 the central furrow narrow; eyes projecting, oval; palpi densely covered with white 

 pubescence. Thorax shining, impunctate ; mesopleurse in front and metathorax covered 

 with long white hair. Mesothorax red, black laterally along the middle lobe, the 



