K. Jordan and N. C. Rothschild 
13 
2. Genas: Pariodontis gen. nov. 
Head. Frons without tubercle (PI. II, fig. 1). Genal edge produced 
at anterior angle into a long curved tooth. Antennal cavity closed. 
Second segment of antenna transverse, bearing a row of long hairs, 
which reach beyond the club in $ ; club globular, a little longer in </ 
than in $, anteriorly solid, but the lines of separation of the central 
and distal segments distinctly marked, especially in </; proximal 
segments of club free on hinder side. Internal incrassation from base 
of antennal groove upwards not very distinct in $ . Eye round; usually 
a small bristle in front of it, a second beneath it, and a third above oral 
edge. Mandible rather broad, densely serrate at apex. Labial palpus 
consisting of 4 segments. 
Thorax. Tergites with one row of bristles; no spines before apex 
of mesonotum. Pronotum longer than mesonotum (PL II, fig. 1), and 
this longer than metanotum. Epimerum of mesothorax oblique, the 
stigma being partially uncovered. Episternum of metathorax large, 
separated from the sternum. Bristles of thorax and abdomen stout. 
Prosternum widest before apex. 
Abdomen. Tergites with one row of bristles; seventh tergite 
bearing one long bristle before the apical edge. Stigmata large. 
Legs. Internal rod-like incrassation of midcoxa dividing above 
the centre. Hindcoxa with comb of short spines on inner side. Ventral 
surface of hindfemur evenly convex. First fore- and midtarsal segment 
shorter than the second. Fifth tarsal segment considerably dilated 
towards apex. 
Modified segments. Modified segments of the same type as in 
Loemopsylla. 
This genus also, like Pulex, contains but one species, which is found 
apparently all over Africa on TLystrix cristatus. 
The genus Pariodontis is undoubtedly allied to Pulex and Loemo¬ 
psylla. Pariodontis riggenbachi, however, is so distinct from irritans 
and cheopis that it demands a special genus. 
In the non-pectinated eyed Pulicidae, with the exception of the 
present genus, all three thoracic tergites, or at least the pro- and 
mesonotum, are short, and show a distinct tendency to become more 
and more reduced in length as specialisation continues. 
In P. riggenbachi, on the other hand, the prothorax is longer than 
in any other member of the family Pulicidae, and the mesonotum also 
is not reduced. The long thorax may be an ancestral character, but 
