368 HYMENOPTERA OF AMERICA. [PART I. 



Gem PTEROCHILUS Kldq. 

 Pteroc.kilus Kujg. ; Latk. ; Say ; Sapss. 



Buccal parts elongate. 



Labium very much elongate; palpi very large, thick, and 

 much elongate, composed of three joints, of which the first is 

 swelled at the extremity; the 2d and 3d strongly compressed 

 and bipectinate, with very long piiosity ; the 3d joint very 

 elongate. — Maxillary palpi normal, composed of six joints. — 

 Mandibles large, elongate, trenchant, in the form of a knife 

 blade; the internal edge trenchant, iobed, or notched; the 

 external edge ciliated with long hair. — Glypeus wide, often 

 lozenge-shaped or trapezoidal, more or less transverse. — Thorax 

 rounded anteriorly and posteriorly, globular or ovate. — Abdomen 

 ovate, depressed, the first segment cup-shaped, subsessile. — 

 Antennee of the males terminated by a hook or by a curved 

 spiral. 



These insects have much the same appearance as the Epipona, 

 but they are very distinct by the extraordinarily large labial 

 palpi, which are feathery, with very long hair. 



The A merican species belong to the group of PL phaleratus and 

 biglumis, characterized by their indented mandibles and rounded 

 metathorax. 



1. Ft. ILewisii Cressox.— Validus, niger, falvo-pubesoens ; clypeo, 

 antennis basi, capitis raaculis, pronoti macula snbalari, maculis 2 

 scutelli et 2 metanoti pedibusque ferrugineis ; tegnlis et post-scutello 

 flavescentibus ; abdominis segmentis 1°, 2° rufis, basi nigris, omnibus 

 flavo-limbatis ; alis inquinatis. 



Pterochilus Leioisil Cresson, Amer, Entom. Trans., I, 18G7, 382, 25, J. 



Total lengtb, 8.5 lin. 



9. Robus.t ; head and thorax clothed wilh a pale fulvous 

 pubescence ; abdomen silvery-sericeous in certain lights. Head 

 black, densely punctured; posterior orbits broadly, anterior 

 orbits narrowly, from the emargination down, the clypeus entirely, 

 the mandibles, except the tips and base and lower margin 



