PULICINm 



865 



D. Ctenidia absent on prothorax and head. 



I. Terminal segment of antennae short, only distinctly segmented 

 posteriorly. Hind coxa with a comb; fifth tarsal segment 

 with four lateral and one subapical bristle. 



(1) Forms with small mesial tubercle — Mceopsylla. 



(2) Forms without small mesial tubercle: — 



(a) Mesosternite with internal rod-like incrassation from inser- 



tion of the coxa upward. 

 {a) Anterior angle of genal edge prolonged backwards into 

 a triangular lobe ; pronotum stronger than metanotum 

 — Pariodontis. 



{b) Anterior angle of genal edge not produced into tri- 

 angular lobe — Xenopsylla. 



(b) Mesosternite without internal rod-like incrassation from 



insertion of the coxa upward — Pulex. 

 II. Terminal segment of antennae segmented all round; hind coxa with- 

 out a comb; fifth tarsal segment with four lateral bristles and 

 one subapical hair. 



(1) Terminal segment of antennae symmetrical; genal process with 



a number of bristles — Parapsyllus. 



(2) Terminal segment of antennae asymmetrical; proximal segments 



sloping backwards. Genal process with only one to two 

 bristles- — Phopalopsylla. 

 III. Terminal segment of antennae segmented all round; symmetrical. 



Hind coxa without comb. Fifth tarsal segment with five 

 lateral bristles at least, and subapical hair. 



(1) Antennal groove open behind. 



[a) Abdominal tergites with one row of bristles, except first, 

 which bears two. First hind tarsal segment shorter than 

 second — Coptopsylla. 



[h) Abdominal sternites with very numerous short bristles. 

 First mid-tarsal segment longer than second — Goniopsyllus. 



(2) Antennal groove closed behind. 



Abdominal tergites with one row of bristles — Lycopsylla. 



Subfamily Typhlopsyllin^. 



Pulicidae with eyes absent or very rudimentary. Head rounded 

 in front. Body thin. 



Genera. — Ctenopsylla Kolenati; Ctenophthalmus Kolenati, 1857; 

 Typhlopsylla Wagner; Neopsylla Wagner; Typhloceras Wagner. 

 Ctenophthalmus can be recognized by having movable ctenidia 

 in front of the ocelli, and the rest can be differentiated as follows : — 



I. Third tarsal with five lateral bristles on each side — Typhloceras. 

 ,11. Third tarsal with four lateral and two accessory bristles — Ctenopsylla. 



III. Third tarsal with four lateral and no accessory bristles — Neopsylla. 



IV. Third tarsal with three lateral and two accessory bristles — Typhlopsylla. 



Subfamily HystrichopsyllinvE. 



Abdominal tergites with one or more ctenidia; posterior tibial 

 spines in numerous short, close-set, transverse rows on posterior 

 border, with about four spines in each row; female with four 

 antepygidial bristles on each side. 



GeneTa—Hyslrichopsylla Taschenberg, Macropsylla. . 



THE FLEAS OF RATS AND MICE. 

 The following table gives the fleas observed on rats, mice, and 

 field-mice, by Tiraboschi and Rothschild. 



55 



