Vol. VI] FERRIS— AN OP LUR A 135 



21 — Occiput deeply sunk into the thorax, rostrum sur- 

 rounded by denticles, pleural plates quite large 



Genus Eulinognathus 



Occiput not deeply sunk into the thorax, rostrum 

 not surrounded by denticles, pleural plates minute .... 



Genus Hcomodipsus (in part) 



22 — Abdominal tergites and sternites with not more than 



two rows of hairs or spines 23 



Abdominal tergites and sternites in part with three 



rows of hairs or spines Genus Hoplopleura 



23 — First antennal segment with a short, stout spine at the 



distal post axial angle or on the posterior margin 



Genus Ncohcematopinus (in part) 



First antennal segment not so 24 



2A — Posterior margin of second abdominal tergite of male 

 distinctly emarginate with a group of spines at each end 

 of this emargination . . .Genus Neohcumatopimis (in part) 

 Posterior margin of second abdominal tergite of male 



not thus emarginate 25 



25 — Abdomen with distinct, chitinized tergal and sternal 



plates in both sexes Genus Polyplax 



Abdomen without distinct, chitinized tergal and 

 sternal plates in the female and with these absent or ex- 

 tremely reduced in size in the male . . Genus Linognathoides 



Family PediculidcB 



Leach, Zool. Misc., Vol. 3, p. 64 (1817) ; Giebel, Insecta Epi- 



zoa, p. 21 (1874) ; Piaget, Les Ped., pp. 615-618 (1880) ; 



Enderlein, Zool. Anz., Vol. 28, p. 136 (1904) ; Dalla Torre, 



Gen. Ins., Anopl., p. 8 (1908). 



Antennas five- or three- (obscurely five-) segmented. Eyes 

 present, distinctly pigmented. Legs fitted for climbing, the 

 tibiae with a thumb-like process opposing the claw. No pre- 

 tarsal sclerite between tibia and tarsus. Parasitic upon man, 

 apes, and monkeys. 



Subfamily Pedicidince 



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

 Torre, Gen. Ins., Anopl., p. 8 (1908). 

 Antennae distinctly five-segmented. No pleural plates. 



