142 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Family Hcematopinidce 



Enderlein, Zool. Anz., Vol. 28, pp. 136, 137 (1904) ; Dalla 

 Torre, Gen. Ins., Anopl., p. 10 (1908). 



Eyes lacking. Antennae three- or five-segmented. Tibiae 

 with a thumb-like process opposing the claw. 



Subfamily Hcematopinince 



Enderlein, Zool. Anz., Vol. 28, pp. 136, 138 (1904) ; Dalla 

 Torre, Gen. Ins., Anopl., p. 10 (1908). 



Antennae five-segmented. Anterior legs of practically the 

 size of the others. A triangular skeletal piece (pre-tarsal 

 sclerite) present between tibia and tarsus. 



Genus Hcematopinus Leach 



Leach, Zool. Misc., Vol. 3, pp. 64-65, f. 146 (1817) ; Den- 

 ny, Mon. Anopl., pp. 24-25 (1842); Giebel, Ins. Epizoa, pp. 

 33-35 (1874) ; Piaget, Les Ped., pp. 633-635 (1880) ; Ender- 

 lein, Zool. Anz., Vol. 28, p. 138 (1904) ; Neumann, Arch, de 

 Par., Vol. 13, pp. 529-532 (1909); Dalla Torre, Gen. Ins., 

 Anopl., p. 10 (1908); Kellogg & Ferris, Anopl. and Mall., 

 p. 10 (1915). 



Head with very sharp, forward pointing temporal angles. 

 Thorax broad. Legs all of practically the same size, with a 

 strongly chitinized skeletal piece between tibia and tarsus. Ab- 

 domen with a swollen, pad-like, chitinized area on the lateral 

 margins of the third to eighth segments. Tergites and stern- 

 ites with a varying number of small chitinized plates. Each 

 tergite and sternite with one transverse row of very small 

 hairs. 



Recorded from Perissodactyla and Artiodactyla. 



Type of the genus, Hcematopinus suis (Linnaeus). 



1 — Hcematopinus asini (Linnaeus). From the domestic horse 

 and the ass (cosmopolitan). Also from Equus burchelli 

 (Zool. Mus. Hamburg). 



1758. Pediculus asini Linnaeus, Syst. Nat., 10th ed., 

 p. 612. 



