IN THE ORDER APHANIPTElt A. o()l 



bristle near its internal apex. The dissections of Cerato- 

 phylliis are taken from the Piilex hirimdinis, which is con- 

 sidered as the type, and of which the antennae are described 

 as slightly attenuated and four-jointed, although one of them 

 is represented in the plate as five-jointed. Of the species 

 figured as the example of the genus, Cer. elongatus, the an- 

 tennae are not described; but in fig. 16 they are represented 

 as eight-jointed, the basal joint being pear-shaped, the second 

 subcyathiform, and the remainder transverse, forming a thick 

 oval mass. In the coloured figure of this insect, these organs 

 are however represented of the same attenuated form as in 

 Cer. hirundinis, and apparently having only six joints. And 

 in the Pulex talpa, which is expressly stated to belong to 

 Ceratophylliis, the antenna are described and figured as 

 ten-jointed, the basal joint being ovate-truncate, and the nine 

 remaining annulose, and forming a rather elongate-ovate mass. 

 M. Duges, in his admirable " Recherches sur les Caracteres 

 Zoologiques du Genre Pulex," has described and figured the 

 antennae of various species of fleas. In the P. irritans they 

 are described as three-jointed:" " Le premier article est court, 

 le denxieme long el epais, arme dhine grosse apophyse et 

 d'un bouquet de polls, le troisieme est plat, elargi en jmlelte, 

 et diinse en lanieres ou digitations de plus en plus courtes 

 d'avant en arriere." The antenna of P. cams is described as 

 " peu dijferente de celle de Vespece precedente, un pen plus 

 grosse et plus courte."" In the P. musculi, Dug. (Cerat. tnuris? 

 Curt.) the antenna '' prese7ite cette particular ite, que le pre- 

 mier article est long et le deuxieme court, le troisieme j)eu 

 large est strie en travers, et dentele sur un de ses hords ,-" 

 and in the P. vesper tilionis, this organ is " presque toute 

 semblable a celle du P. musculi." 



Such are the various formations stated to exist in the an- 

 tennae of different species of fleas. Now on comparing the 

 characters given by Mr. Curtis of his genus Ceratopliyllus, 

 with those of Pulex, it will be seen that, with the exception of 

 the formation of the antennae, scarcely the slightest diflerence 



^ Either M. Duges has overlooked the articulation which I noticed between 

 the second and terminal joints, or I have mistaken the contracted base of the 

 latter for a distinct articulation. From the numerous sketches, however, which 

 I made of the antennae of P. cams in various positions, I think myself warranted 

 in considering the former to be the case. 



NO. IV. VOL. I. 3 A 



