70 CALIFORNIA ACADEMY OF SCIENCES. 



Nirmus pacificus n. sp. (Plate V, fig. 8). 



Two males from a Tufted Puffin, Lunda cirrhata; 

 one male from a Black-bodied Shearwater, Piiffi^nus 

 griseiis ; and specimens, males and females, from two 

 Pigeon Guillemots, Cej^phus columha — all the birds from 

 the Bay of Monterey, California. The specimen from 

 Pujffinus is almost certainly a straggler, as no other 

 specimen was taken from the fifty-five individuals of 

 Puffi^nus examined. The new species belongs to Pia- 

 get's group zonati (Les Pediculines, p. 187), and is 

 most like citrinus (ibid. p. 190, pi. xvi, fig. 8). The 

 metathorax, however, is angulated, not flatly rounded, 

 as with citrinus, on the abdomen, and there are other 

 differences. 



Description of the male. Body, length 1.46 mm., 

 width .5 mm.; short, broad, Docophoroid in form; 

 light golden brown with conspicuous broad, dark anten- 

 nal bands and dark brown to black lateral abdominal 

 bands interrupted segmentally. 



Head, length .5 mm., width .4 mm.; broadly conical; 

 clypeal front very slightly concave; three marginal 

 hairs on the front, one on the clear portion, and two 

 before the suture; a short marginal prickle in front of 

 the trabecule, one dorsal hair just back of the first 

 marginal, a second dorsal hair near the second margi- 

 nal, two dorsal hairs between the suture and the trabec- 

 ules which are distinct and slightly colored; the anten- 

 nae are short, segments 2 and 5 being longer than the 

 others; color, the light golden brown of the head 

 marked with slightly darker brown; eyes inconspicuous, 

 with two short prickles; temples with sides nearly 

 straight, rounding on posterior angles, with one very 

 long hair, one shorter, weaker hair, and two short 

 , prickles; occipital margin concave; clypeus with a pale 



