36 NORTH AMERICAN ANOPLURA 



uropteri (Osborn), and immediately following his diagnosis of it he pro- 

 posed a second genus, lAcanthopinus, which Cummings has quite recently 

 shown should be united with N eohaemato pinus . We have specimens of 

 both genera and are entirely in accordance with the opinion of Cum- 

 mings, for, altho there appears at first sight to be a division into two 

 sharply marked groups, these groups are connected by intermediate 

 forms. 



The genus is extremely close to Polyplax, yet there are certain char- 

 acters common to all its members which are found in none of the species 

 of Polyplax. Of these differences the most notable is the character of 

 the second tergite of the male, which in all the species of Neohaemato- 

 pinus thus far described has the posterior margin distinctly emarginate 

 and bearing a closely set group of spines of various lengths at the ends 

 of this emargination — a character that is present in none of the males 

 of Polyplax. 



The genus is composed entirely of Sciurid-infesting species, at pres- 

 ent five in number. We are recording two species previously described, 

 and one which is new. 



Neohaematopinus sciuropteri (Osborn). 

 Plate I, fig. 1 ; plate V, figs. 2 and 13. 



Haematopinus sciuropteri Osborn, Bui. 7, o. s., U. S. Dept. Agr., Div. Ent., pp. 



23-24, fig. 12, (1891) ; Bui. 5, n. s., U. S. Dept. Agr., Div. Ent., pp. 182-183, 



fig. 105, (1896). 

 Neohaematopinus sciuropteri Mjoberg, Arkiv. for Zoologi, vol. 6, no. 17, p. 160, 



(1910). 



One male, taken from a skin of Sciuropterus sp. (Eureka, Calif.) in 

 the Stanford University collection. The species was originally described 

 from the male alone, and no description of the female has ever been pub- 

 lished. 



Neohaematopinus antennatus (Osborn). 



Plate V, fig. 10; plate VI, fig. 5; text fig. 14, A and B. 



Haematopinus antennatus Osborn, Bui. 7, o. s., U. S. Dept. Agr., Div. Ent., p. 25, 

 fig. 13, (1891) ; Bui. 5, n. s., U. S. Dept. Agr., Div. Ent., pp. 183-184, fig. 106, 

 (1896). 



Polyplax (?) antennata Enderlein, Zool. Anz., vol. 28, p. 143, (1904). 



Polyplax (?) antennata Dalla Torre, Genera Insect., Anoplura, p. 13, (1908). 



Acanthopinus antennatus Mjoberg, Arkiv. for Zoologi, vol. 6, no. 13, p. 161, (1910). 



Several males and females from Sciurus grisens (Inverness, Marin 



