394 HYMENOPTEEA. 



Antennae a little longer than the body, faintly microscopically pilose, the scape bearing 

 white hairs. Head closely punctured, more strongly so at the top and behind ; clypeus 

 shining, finely punctured round the edges, more faintly punctured in the centre; 

 mandibles red ; palpi black. Thorax covered with a short silky white pile ; the top 

 closely, the sides and metathorax more strongly, punctured ; scutellum shining, bearing 

 some widely separated punctures ; apex of the metathorax semioblique, margined at the 

 top, and toothed laterally. Abdomen scarcely so long as the head and thorax united, 

 and bearing on the apical three fourths a close, short, sericeous pile; closely and 

 uniformly punctured, the base without any carinse ; a roundish red mark on either side 

 at the base and apex. Legs obscure yellowish-white ; the coxae, the trochanters, the 

 basal three fourths of the four anterior femora, the posterior femora (except the apex), 

 the apices of the hind tibiae and tarsi, broadly black. Wings hyaline, faintly smoky in 

 the middle ; the costa and nervures in front of the stigma fuscous, behind it yellowish- 

 white ; first transverse cubital nervure curved ; cubital nervure but slightly bent at the 

 second cubital cellule. 



V % Chelonus basimacula. (Tab. XVI. fig. 6, $ .) 



Niger, scapo antennarum pedibusque anterioribus rufis, abdominis basi late, tibiis tarsisque posticis albis ; 



coxis, femoribus posticis pro parte tibiarumque posticarum apice late liigris ; alis hyalinis. $ . 

 Long. 4' 5 millim. 



Hab. Panama, Bugaba [Champion). 



Antennae nearly as long as the thorax and abdomen united ; 16-jointed, the flagellum 

 covered with a silvery silky pile. Face transversely striated, the centre indistinctly 

 keeled ; vertex obliquely striated ; front depressed and keeled in the centre ; palpi 

 fuscous; mandibles piceous. Thorax opaque, covered with silky white hair; pleurae 

 rugose ; mesonotum coarsely aciculated, a stout keel running down its entire length, and 

 two short keels on either side of this at the base ; scutellum shining in the centre, stoutly 

 keeled at the base and at the sides ; metanotum coarsely longitudinally reticulated, its 

 apex nearly perpendicular. Abdomen about as long as the head and thorax united ; the 

 base deeply excavated and keeled, the keels being continued on to the top and converging 

 towards the apex of the first segment ; the basal part closely irregularly striated (this 

 striation is continued to the apex, but becomes much finer there), the extreme apex being 

 rather punctured than striated, and also densely covered with a grey pile ; the ventral 

 surface shining, and bearing a keel on either side at the apex. Legs stout, covered with 

 a white pile ; the tips of the coxae, the base and apex of the hind femora, and the base 

 of the hind tibiae, reddish ; the apices of the tarsi blackish, the middle tibiae and tarsi 

 much paler in tint than the anterior tarsi. Wings : the median nervure at the base, the 

 transverse basal nervure, and the basal part of the cubital nervure, curved ; the cubital 

 nervure beyond the second cubital cellule, and the transverse cubital nervure, faint ; the 



