534 IV AR TRÂGARDH 



and a half times as wide at the base as it is long, with two nar- 

 row, pointed cusps at the antero-lateral angles ; twice as long as 

 their distance from one another. The configuration of the ante- 

 rior edge varies in différent spécimens. In the spécimen deli- 

 neated (from Rivière souterraine de Verna jouis, commune de 

 Vernajouls, canton de Varilhes, département d'Ariège, France, 

 2nd November 1908 ; N^ 244 A) it is straight near the cusps, 

 but slightly concave in the middle ; in another spécimen 

 (N*^ 291) it is slightly convex in the middle. 



The mandibles (fig. 22 a et b) share with the main form a 

 very exceptional feature which is not, as far as I know, met with 

 in any other Parasitinae, viz. a bifurcated calcar mandibuli 

 one branch of which ends free. They are of the type which 

 is characterized by the top of the upper jaw being more or 

 less widened, and which is found in Eug. magnus Kram., 

 Eug. furcatus G. et R. Can., and others. 



Lower jaw comparatively shorter than in the main form, 

 but wider ; terminal tooth short, but acutely pointed, perpendi- 

 curlar ; upper edge with sharply pointed tooth, directed slightly 

 backwards, beyond the middle of the jaw ; behind the tooth 

 the edge is very slightly convex. Calcar mandibuli of even 

 width throughout, 7 : 5 as wide as the jaw itself ; it is fused 

 with the jaw beyond the middle, forming with the jaw a narrow 

 loop about half as long as the jaw. 



From near the base of the calcar a narrow, finger-shaped 

 appendage projects forwards nearly on to a level with the 

 médian tooth. 



The upper jaw with almost straight ventral, and slightly 

 convex dorsal, edge ; it gradually tapers towards the top of 

 the ventral jaw, where it is neck-like constricted, but widens 

 again towards the top, where it bends downwards, and is 

 almost twice as wide as at the constriction, with a convex, 

 thin edge, with acutely pointed corners ; opposite the termi- 

 nal tooth of the lower jaw the ventral edge has a deep semicir- 

 cular incision, at th^ bottom of which there is a deep groove 



