lb CALIFORNIA ACADEMY OF SCIENCES. 



a median sternal blotch rounding posteriorly with a 

 sharp constriction about midway to the arrow-headed 

 anterior portion. 



Abdomen elongate, with one or two slender hairs in 

 the posterior angles of the segments, two strong, pustu- 

 lated hairs in the posterior margins of the segments; 

 abdomen dark fulvous brown with broad, ill-defined, 

 darker lateral bands, and a transverse linear band 

 along the posterior margin of each segment of a darker 

 brown, adjacent to which are the small uncolored stig- 

 matal spots; the uncolored sutural lines distinct; seg- 

 ment 1 has the transverse band divided by a narrow 

 uncolored median line; segments 8 and 9 more evenly 

 colored; last segment angularly emarginated, with two 

 anal blotches; two short hairs on the posterior margin 

 each side of the emargination. 



Nirmus actophilus n. sp. (Plate VI, fig. 4): 



Many specimens from nine out of fifteen individuals 

 shot of the Sanderling, Calidris arenaria (Bay of Mon- 

 terey, California). A member of Piaget's group obscuro- 

 suturati (Les Pediculines, p. 169) and resembling some- 

 what incequalis (ibid., p. 176, pi. xv, fig. 1) from 

 jShtmenius arquata. 



Description of the female. Body, length 1.59 mm., 

 width .4 mm.; pale, with distinct, narrow, lateral bands 

 of dark brown to black, head darker brown than the 

 thorax, with dark narrow marginal markings. 



Head, length .37 mm., width .28 mm.; conical, but 

 little wider through the temples; clypeus broadly 

 rounded, with four marginal hairs, three on the front 

 before the suture, and one long one before the trabecular, 

 also a short prickle just at the angle of the trabecules; 

 a dorsal hair between the two anterior marginal hairs. 



