POLYtENTTS.— cheistolia. 247 



Antennse stout, longer than the body, the yellow ring on the flagellum broad. Head 

 punctured, except behind, the middle of the vertex, and the mandibles. Thorax strongly 

 punctured ; the pleurae longitudinally, the apex of the metanotum transversely, striated ; 

 base of the metanotum impunctate, behind the transverse keel punctured, before it, in 

 the centre, reticulated. Metathoracic tubercles large, stout, a little curved. Thorax 

 black ; the collar in front, a line on the edge, the tegulse, a large mark on the meso- 

 pleura, the tubercles, a mark under the hind wings, the greater part of the metapleura, a 

 mark at the apex of the middle lobe, the carina? in front of the scutellum, the scutellum, 

 two large marks on the metanotum (covering the tubercles), white. Abdomen rufous, the 

 greater part of the petiole black, the apex of the postpetiole yellow. Legs rufous, the 

 anterior pair yellowish or fulvous in front ; the coxse yellow, marked with black behind, 

 the hind pair rufous, sometimes tinged with yellow at the base ; femora for the greater 

 part black above, but especially towards the apex. Areolet minute, closed at the apex. 



The male has the breast white, and the second abdominal segment more or less 

 black, otherwise coloured as in the female. 



7. Polyaenus volcanicus. 



Niger, flavo varius ; apice scutelli coxisque anterioribus, flavis, abdomine rufo ; pedibus fulvis, anticis flavis ; 



alis hyalinis. 

 Long. 14 millim. ; terebra 6 millim. 



Hab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



Similar in coloration to the preceding species, but differing in having the basal half 

 of the scutellum black, the base of the metanotum more strongly punctured, and the 

 ovipositor longer. The femora are lined above with black. 



CHEISTOLIA. 



Christolia, Brulle, Hist. Nat. Ins. Hymen, iv. p. 163. ^ 



This genus does not seem to me to be clearly defined from Mesostenus, and still less 

 from Cryptanura. The species (as are also those of Cryptanura) are neotropical, and 

 are much less numerously represented than the typical forms of Mesostenus. 



1. Christolia nubecula. 



Christolia nubecula, Cresson, Proc. Acad. Phil. 1873, p. 163 (j) 1 . 

 Hab. Mexico, Orizaba x (Sumichrast). 



2. Christolia panamensis. (Tab. x. fig. 27.) 



Niger ; annulo antennarum, palpis, abdominis apice tarsorumque posticorum apice, albis ; alis hyalinis, stigmate 



nigro. 

 <S facie alba, stemo coxisque sordide flavis. 

 Long. 20-22 millim. 



Hab. Panama, Bugaba, Volcan de Chiriqui 2000 to 3000 feet [Champion). 



