Vol. VI] FERRIS— AN OPLURA 171 



1896. Hmnatopinus sciuroptcri Osborn, Bui. 5, n. s., 



U. S. Dept. Agr., Div. Ent., pp. 182-183, £. 105. 

 1904. Polyplax ? sciuropferi Enderlein, Zool. Anz., 



Vof. 28, p. 143. 

 1908. Polyplax f sciuroptcri Dalla Torre, Gen. Ins., 



Anopl., p. 14. 

 1910. N cohccmatopinus sciuroptcri Mjoberg, Ark. f. 



Zool., Vol. 6, pt. 13, p. 160, f. 79. 

 1912. Ncohccmatopinus sciuroptcri Cummings, Bui. 



Ent. Res., Vol. 3, p. 393. 



1915. Ncohccmatopinns sciuroptcri Kellogg & Ferris, 

 Anopl. & Mall, of N. Am. Mam., p. 36; pi. 1, 

 f. 1 ; pi. 5, f. 2, 13. 



1916. Ncohcematopinus sciuroptcri Ferris, Psyche, 

 Vol. 23 (in press). 



Genus Polyplax Enderlein 



Polyplax Enderlein, Zool. Anz., Vol. 28, pp. 139, 142, 223 

 (1904) ; Dalla Torre, Gen. Ins., Anopl., p. 13 (1908) ; Mjo- 

 berg, Ark. f. Zool.. Vol. 6, pt. 13, p. 159 (1910) ; Fahrenhoiz, 

 2-3-4th Jahresb. Niedersach. Zool. Ver., pp. 29-30 (1912); 

 Kellogg & Ferris, Anopl. & Mall, of N. Am. Mam., p. 11 

 (1915). 



Hccmatopimis (Polyplax) Neumann, Arch, de Par., Vol. 

 13, pp. 529-532 (1909). 



Ercmophthirius Glinkiewicsz, Sitz. d. Kaiserl. Ak. Wiss. 

 Wien, Natur. Klasse, Vol. 116, pp. 381-383 (1907). 



Antenuc-e sometimes differing in the sexes, the male fre- 

 quently having the third segment with a distal, preaxial 

 process. Anterior legs small with slender claw, middle legs 

 larger with stouter claw, posterior legs somewhat larger and 

 with heavier claw than the middle. Female with most of the 

 abdominal tergites and sternites divided into two transverse 

 plates, each bearing a row of spines or hairs. Male with a 

 smaller number of tergites and sternites thus divided. Pleural 

 plates present. Spiracles small. 



One species recorded from SoricidcB (Insectivora), one 

 from Myoxidcc (Rodentia), the remainder from Miiridcc (Ro- 

 dentia). 



Type of the genus Polyplax spinulosa (Burm.) 



