384 HYMENOPTEEA. 



abdomen shorter and having only the apical two segments black ; the petiole entirely- 

 smooth, not so flat on the top, and without any distinct furrow along the side ; the 

 second segment not striated, only obscurely transversely wrinkled; and the second 

 cubital cellule longer, and considerably more than twice the length of the third. 



ODONTOBRACON. 



Head cubital, large, excavated above tbe antennae ; eyes oblong, not reaching nearly to the base of the clypeus. 

 Antenna? filiform, multiarticulate ; first joint of the flagellum a little longer than the second. Thorax 

 elongate, stout, contracted in front, broad and transverse behind ; mesonotal sutures deep, or moderately 

 deep ; the transverse depression at the base of the scutellum crenulated ; metathorax large, of nearly 

 equal width, usually coarsely rugose, ending laterally in a stout tubercle. Abdomen broadly sessile, 

 broadest in the middle, usually a little longer than the thorax ; stoutly longitudinally striolated at the 

 base ; suturiform articulation deep, and usually broad, nearly transverse or curved, generally joined to 

 the deep furrow at the base of the second segment by an oblique or longitudinal furrow ; apical ven- 

 tral segment ploughshare-shaped. Ovipositor shorter or longer than the abdomen. Legs rather short, 

 stout ; femora short, thick ; middle tarsi shorter than the tibiae, and also shorter than the anterior or 

 hind tarsi ; basal joint of the tarsi not much longer than the second joint ; hind coxae thick, ending behind 

 in a long, stout, curved tooth. Wings long, narrow, with three cubital cellules ; the second cellule small, 

 not more than one fourth of the length of the third cellule, variable in shape ; the second humeral cellule 

 shorter than the first discoidal cellule. 



The toothed coxa? sufficiently distinguish Odontobracon from the other genera of 

 " Doryctinse." The occiput, moreover, is not very clearly margined. 



1 (2) . Prothorax only black ; mesonotal sutures crenulate ; metathorax reticu- 



lated throughout ; second cubital cellule scarcely longer than broad . nigriceps. 



2 (1). Mesothorax black; metanotal sutures and the base of the metanotum 



smooth ; second cubital cellule longer than broad. 



3 (4) . Metanotum red ; the recurrent nervure interstitial crassiventris. 



4 (3) . Metanotum black ; the recurrent nervure not interstitial montanus. 



4 1. Odontobracon montanus. (Tab. XV. fig. 17, ? .) 



Niger, abdomine rufo ; alis fumatis. § . 

 Long. 13 millim. ; terebra 6 - 5 millim. 



Hab. Costa Rica, Irazu 6000 to 7000 feet (Rogers). 



Antennae longer than the body, tapering perceptibly towards the apex ; closely 

 covered with a depressed pile, which is somewhat long at the base of the flagellum. 

 Face coarsely rugosely punctured; a small, shining, projecting part below the an tennse ; 

 the rest of the head shining, smooth ; two rather long depressions above the antennae, 

 the depressions separated by a raised part which bears two keels : trophi black ; the 

 palpi pilose. Pro- and mesothorax shining, smooth, the sutures broadly crenulated ; the 

 oblique depression on the mesopleurae broad. Metanotum, except at the base, covered 

 with large, shallow, widely separated, roundish punctures ; the apex semivertical, appear- 

 ing excavated in the middle owing to the sides projecting in large tubercles; the inner 

 side of the tubercles smooth and shining, the central apical portion coarsely punctured. 



