248 HYMENOPTEKA. 



Antennae as long as the body, stout, thicker towards the apex, the third joint longer 

 than the fourth. Head a little wider than the mesothorax, retreating behind the eyes ; 

 front a little projecting ; clypeus transverse at the apex, the face transversely rugose, 

 opaque. Mesonotum minutely and rather indistinctly punctured, the furrows obsolete. 

 Scutellum smooth, shining, impunctate ; the sides at the base above carinate, laterally 

 hollowed, strongly striated. Metathorax densely covered with silvery white hair, the- 

 base laterally opaque, obscurely aciculate, the middle and the rest of it transversely 

 striated, the apex hollowed in the middle; the upper transverse keel curves round 

 to the extreme base, the second interrupted in the middle ; tubercles blunt, short. 

 Petiole and postpetiole smooth, shining, impunctate ; the rest of the abdomen scarcely 

 so shining, the sides covered with short pale down. The anterior legs (including the 

 coxae) are obscure testaceous in front, the middle tibiae and tarsi less so. 



The clypeus may be entirely black or yellow ; the apex of the abdomen may be only 

 white in the middle, or there may be two or three transverse marks on the intermediate 

 segments. Some specimens (especially those with the mouth black) have the pleurae- 

 more densely pilose than others. 



The male has the orbits, the face below the antennae, the clypeus, and the mandibles 

 (except at the tips), yellow ; all the coxae beneath, and the four anterior legs on the 

 under side, obscure testaceous. 



3. Christolia calcarata. 



Christolia calcarata, Cresson, Proc. Acad. Phil. 1873, p. 164 (cT) 1 . 

 Hah. Mexico, Orizaba 1 (Sumichrast). 



4. Christolia menticula. (Tab. X. fig. 29.) 



Niger ; antennarum annulo, tegulis, scutello, postscutello, maculis abdominis apice tarsorumque posticorum 



apice, albis ; pedibus runs, tibiis tarsisque posticis nigris ; alis byalinis, stigmate nigro. 

 3 facie flava. 

 Long. 18-20 millim. ; terebra 7 millim. 



Hob. Mexico, Orizaba (Bilimek); Guatemala, San Geronimo (Champion); Panama, 

 Volcan de Chiriqui (Champion). 



Antennae as long 'as the body, stout, thickened towards the apex; the third joint a 

 little longer than the fourth. Head scarcely so broad as the mesothorax, opaque, semi- 

 rugose ; front projecting in the middle, the clypeus not projecting so much, surrounded 

 at the base by a broad and deep furrow, shining, covered with distinctly separated 

 punctures ; the apex almost transverse ; labrum, the base of the mandibles, and the 

 palpi, yellowish. Mesonotum opaque, finely and closely punctured, the furrows clearly 

 denned; scutellum shining, impunctate, the base black, and carinated at the sides, 

 laterally hollowed and striated. Me^thorax densely covered with white hair ; the 

 base aciculate, the rest transversely striated ; the upper transverse keel curves round 

 to the base of the metanotum, the narrower curved part being transversely striated ;, 



