248 PROCEEDINGS OF THE ACADEMY OF [June, 



width mesad. Head'-^ with paired impressions dorso-mesad of anten- 

 nal sockets weakly indicated; eyes longer than cheeks. Pronotum 

 narrower than head, with a weak medio-longitudinal sulcus; prozona 

 moderately convex, lateral portions of metazona strongly ascendent 

 to lateral margins, caudal portion feebly convex; lateral margins 

 parallel. Tegmina and wings fully developed. Dorsal surface of 

 abdomen convex; ultimate segment with sides straight and very 

 feebly convergent caudad, surface weakly convex, except meso- 

 distad where it is very feebly concave and distad on each side above 

 the base of the forceps is found a more convex area, at each of which 

 areas the distal margin is weakly convex. Pygidium declivent, 

 longer than broad, rectangulato-oval. Forceps elongate and slender; 

 ■shaft evenly and not strongly curved, moderately flattened cylin- 

 drical, stout proximad with a heavy truncate tooth, thence narrow 

 in proximal third to a sharp medio-internal tooth, this portion with a 

 row of minute, well spaced projections, thence the shaft is unarmed 

 and of equal width to the slight internal swelling near the apex, 

 from which point it tapers rapidly and curves more decidedly to the 

 acute apex.^^ 



Length of body 10.2, of pronotum 1.6, of tegmen 3.6, of exposed 

 portion of Aving 1.8, of forceps 4.4; width of pronotum 1.6, greatest 

 width of abdomen 2.7, of ultimate dorsal abdominal segment 2.1 mm. 



Coloration of head, prozona and dorsal surface of abdomen tawny. 

 Metazona, tegmina, exposed portion of wings, limbs and underparts 

 ochraceous tawny. Forceps dull chestnut. 



The type of this interesting species is unique. 



Osteulcus kervillei (Burr). 



1905. Ancistrogaster kervillei Burr, Ann. Mag. Nat. Hist., (7), XVI, p. 490. 

 [Region of Merida, Venezuela.] 



jMerida, Venezuela, 1 c?, [Hebard Cln.]. 

 This topotype agrees in every way with Burr's original description, 

 €xcept in having the tegmina not carinate and in being somewhat 

 larger than the maximum in the type series. There is no room for 

 doubt that the present insect represents this species. In consequence, 

 the characterization of the tegmina as keeled and Burr's figure,'^ 

 showing this condition strikingly developed, are either incorrect 



^^ The features given in the generic diagnosis are not repeated in this descrip- 

 tion. 



^'^ The form of the distal portion resembles a weakly curved claw. This general 

 type is probably characteristic of all tiie species properly referable to the Ancis- 

 trogastrinse. 



-''Genera Insedorum, Fasc. 122, Dermaptera, PI. VII, fig. 18, (1911). 



