] 82 [August, 



DESCRIPTION OF THE MALE OF CERATOPHYLLUS BOREALIS, 

 KoTHs. (1906). 



BY THE HON. N. CHARLES ROTHSCHILD, M.A., F.L.S. 



Plate IV. 



In Eut. Mo. Mag. (2), XVIII, j). 11, I described a new species 

 of flea as CeratophyUns borealis from a single ? obtained by Mr. N. H. 

 Joy on the Island of St. Kilda from the nest of a gannet. 



The specimen remained unique until 1912, when the Rev. J. 

 Waterston found a number of examples of this species in the Shetland 

 Islands in a nest of Antlius ohscurus, of which he kindly gave me some 

 specimens of both sexes. 



The (J being still undescribed, I submit a drawing of the genital 

 organs which, as usual in Siphoiiaptera, offer easily recognisable 

 distinctions from the allied species. 



C horealis comes near C. columhx. and sjnnosua in the armature of 

 the ninth abdominal sternite of the J* . The movable process (F) of 

 the clasping organs bears five bristles in the apical half of the distal 

 ( = ventral) margin of which the upper one is somewhat thicker than 

 the others, being, however, slightly shorter than the fourth from the 

 top. The ninth sternite bears thi-ee very stout apical bristles on each 

 side, one of them being usually distinctly longer than the others. 

 The apical membranous lobe of this stei-nite is triangular. 



As in the 5* > the hind femur bears a subventral row of four 

 bristles on the inner surface, exclusive of the subapical bristle, and no 

 subventral bristles on the oviter side apart from the subapical one. In 

 this C. horeaUs differs from C. spinutms, Wagn. (1903), which bears a 

 much larger number of bristles on the hind femur. 



Arundel House, 



Kensington Palace Gardens, W. : 

 May 6th, 1913. 



^ THE DENTATE MARGIN OF THE ABDOMEN IN CHRYSIS. 



BY T. A. CHAPMAN, M.D., F.Z.S. 



The President's address at the Entomological Society set me 

 thinking on this matter. He did not discuss Chrysids but, in the 

 Aculeates, he told us that female secondary characters liad i-elatiou to 

 maternal duties and that any dorsal apical teeth spines are practically 

 unknown in $ v Aculeates. 



