38 NORTH AMERICAN ANOPLURA 



Neohaematopinus pacificus n. sp. 

 Plate I, fig. 2 ; plate V, figs. 3, ja and yb ; text fig. 14, C and D. 



Numerous males and females from Eutamias townsendi ocrogenys 

 (Freestone, Sonoma county, Calif., and Gualala, Mendocino county, 

 Calif.), Eutamias hindsi (Cazadero, Sonoma county, Calif.), Eutamias 

 sp. (South Yolla Bolly Mt., Tehama county, Calif.), and Eutamias sp. 

 (Sanhedrin Mt., Mendocino county, Calif.). Two females and one male 

 from a skunk, Mephitis occidentalis (Covelo, Mendocino county, Calif.), 

 this last record evidently being due to straggling from chipmunk prey of 

 the skunk. 



This species differs from N. antennatus (Osb.) in having the an- 

 terior division of each segment of the abdomen distinctly chitinized. It 

 is evidently quite close to A r . sciurinus (Mjoberg), a European species, 

 but seems to differ from it in the shape of the head. 



Description of the Female. — Total length 1.00 mm., length of 

 head .2 mm., length of abdomen .7 mm., width of head .17 mm., width of 

 thorax .2 mm., width of abdomen .45 mm. 



Head with the anterior margin very slightly convex and with a 

 slight median point. Lateral margins of the forehead nearly straight and 

 converging somewhat. Temporal angles very prominent, the temporal 

 margins slightly emarginate, the posterior-lateral angles sharp and 

 prominent. Occiput narrow and with posterior margin produced into a 

 slight point. A small brown patch on the anterior margin on each side 

 of the median line. Temporal margin with three or four short spines, a 

 long pair and a short stout spine at the posterior-lateral angle. Anten- 

 nae very close to the anterior margin. First segment large, the distal 

 post-axial angle slightly produced and bearing a short, stout spine. Sec- 

 ond segment more slender but almost as long, with nearly parallel sides. 

 Third segment very short, widest distally, the anterior margin longer than 

 the posterior. Fourth segment similar, but with the posterior margin 

 longer than the anterior. Fifth joint small. 



Thorax shorter and wider than the head, with convex lateral mar- 

 gins, widest slightly anterior to the posterior margin, which is nearly 

 straight. A short spine on each shoulder and two widely separated pairs 

 of spines on the posterior margin of the meso-thorax, the outer spine of 

 each pair being short and sharp, the inner one long and hair-like. Sternal 

 plate kite-shaped, with the posterior margin slightly concave. 



