ILYOPSYLLUS. 143 



Genus 27. ILYOPSYLLUS, Brady and Robertson (1873). 



Body tumid and gibbous. Anterior antennas 

 very short, 5-jointed, basal joint greatly dilated; 

 posterior stout, destitute of a secondary branch. 

 Mandibles small, and bearing a simple bisetose palp. 

 First pair of feet stout, and strongly spined, internal 

 branch composed of one, external of three joints, 

 second, third, and fourth pairs having both branches 

 tri-articulate. Abdomen short and tapering towards 

 the extremity ; caudal setas spathulate. 



1. ILYOPSYLLUS COEIACEUS, B. and R. PI. LXXXII, 



figs. 110. 



Hyopsyllus coriaceus, B. and R. Arm. and Mag. Nat. Hist., 

 ser. 4, vol. xii, p. 132, pi. ix, figs, 1 5 



(1873). 



Body very tumid ; seen laterally (fig. 2) the ventral 

 line is almost straight, the dorsal excessively arched, 

 so that the cephalothorax forms almost a semicircle ; 

 seen from below (fig. 1), the outline is like that of a 

 spear-head rounded off in front ; greatest width situate 

 in the middle, and equal to half the entire length of 

 the body; posterior half abruptly tapered. First 

 cephalothoracic segment very large, forming half the 

 length of the animal. Anterior antennae (fig. 3) 5- 

 jointed, sparingly setose, very minute, the basal joint 



