406 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



In this tribe the author has based his^studies on all of the available 

 material and has therefore included notes and descriptions of Mexican 

 and West Indian species. 



Tribal characters. — Head transverse; occipital carina complete, 

 well-defined ; inner margins of eyes emarginate ; malar space narrow ; 

 clypeus well-defined dorsally; antennae long; niesoscutum long, 

 produced anteriorly, both it and the scutellum without transverse 

 striae or rugosities; propodeum more or less areloated; hind coxae 

 slender, elongate, as long as the hind femora; tarsal claws simple; 

 areolet large, pentagonal; disco-cubitus not strongly curved or 

 angulate; nervulus interstitial or nearly; nervellus perpendicular or 

 reclivous broken at about the middle; abdomen inserted above the 

 hind coxae, petiolate, somewhat compressed and thickened apically; 

 ovipositor well exserted, more or less compressed, vathout a notch on 

 the dorsal margin, apically with oblique ridges or furrows ; hypopy- 

 gidium not reaching the apex of the abdomen. 



TABLE TO THE GENERA. 



1. First tergite bent upwards beyond middle and almost twice as long as the hind 



coxae; prepectal carina terminating below the middle of the mesepisternum 

 which is much longer (cephalocaudad) than high; ovipositor about half as long 

 as the abdomen; cheeks armed; clypeus curved dorsally, short, not depressed 



apically; head distinctly narrowed behind eyes Grotea Cresson. 



First tergite straight, subequal in length with the hind coxae; prepectual carina 

 terminating above the middle of the mesepisternum which is higher than long; 

 ovipositor at least nearly as long as abdomen 2. 



2. Cheeks produced into a broad tooth posteriorly; clypeus short, not depressed apical- 



ly, its dorsal margin strongly curved; face smooth, feebly punctured; head dis- 

 tinctly narrowed behind the eyes; third antennal joint subequal in length with 



fourth and fifth combined Labenidea Rohwer . 



Cheeks unarmed; clypeus long, depressed from above the middle, its dorsal median 

 straight; face roughened; head not receding posteriorly; third antennal joint 

 much shorter than fourth and fifth combined Labena Cresson. 



Genus LABENA Cresson. 



Labena Cresson, Proc.Ent. Soc. Phila.,vol. 3, 1864, p. 399. Genotype. — Cryptus 



grallator Say (Viereck, 1914). 

 Dyseidopus Kreichbaumer, Ann. k.k. Natiu-h. Hofm. Wein, vol. 5, 1890, p. 489. 



Genotype. — Dyseidopus sericeus Kreichbaumer. (Monobasic.) 



Species which belong to the genus Labena have been referred to 

 Gryftus (by Say) and Mesochorus (by Brulle) but since the descrip- 

 tion of the genus in 1864 it has been correctly recognized by most 

 authors. The genus Dyseidopus Kjeichbaumer is synonymized after 

 a study of the original description and is supported by the observa- 

 tions of KJrieger published in 1903. 



The genus Labena although very distinct has a habitus and many 

 characters which suggest the Rhyssine genus Apeclineura Kriechbaumer 

 and more especiall}'' the subgenus Paraneura Morley. As far as known 

 all of the species are parasitic on wood-boring Coleoptera. 



