Manchester Memoirs^ Vol. xliii. (1899), No. 3. 209 



by the recurrent and the first transverse cubital nervures ; 

 the cubital nervure in front of the areolet, the second 

 transverse cubital and the recurrent nervures are largely 

 bullated. Petiole shining, closely strongly and regularly 

 striolated, and with a stronger striolation down the sides 

 at the base, and extending to near the middle of the apical 

 part ; the second and third segments form one piece, the 

 line of demarcation being only faintly indicated at the 

 sides, and are uniformly and closely longitudinally reticu- 

 lated and striated ; the apex of the third rounded at the 

 sides, which have no teeth, the centre looked at from 

 above is transverse. 



This species is very different from R. wroughtoni, 

 differing markedly in some structural points ; e.g., the 

 latter has on each side of the scutellum a stout triangular 

 tooth ; the second and . third abdominal segments are 

 distinctly separated ; the third ends in a stout tooth at 

 the sides. \n R. annulicornis the third segment has a 

 distinct well defined depression along the sides and apex. 



Rothneyia and the new genus, Chreiisa, here described, 

 will form a new division of the Ichneumones, Rothneyince, 

 distinguished by having only the basal three segments of 

 the abdomen very large, the others being very much 

 abbreviated, by the wings having no areolet, by the 

 parapsidal furrows being obsolete, and by the petiolar 

 spiracles being placed between the middle and the apex. 



Chreusa, gen. nov. 



Belongs to the section of the Ichneumonides with the 

 metathoracic spiracles linear, and with the spiracles on the 

 petiole placed between the middle and the apex ; but 

 differs from them all in the three basal segments of the 

 abdomen being large and of equal length ; the third with 

 the apex raised ; the other segments minute, hidden under 



