NEW MALLOPHAGA. IO3 



Nirmus farallonii n. sp. (Plate v, fig. 4.) 



A single female specimen taken from a Farallone Cor- 

 morant Phalacrocorax dilophus albociliatus (Bay of Mon- 

 terey, Cal. ) An immature specimen taken from a Western 

 Grebe, Colymbus scptentrionalis (Bay of Monterey, Cal.) 

 is also probably of this species. It may be a straggler. 

 In general marking and outline this new species resembles 

 Nirmus dispar Piaget, taken by the namer on a Car bo 

 sulcirostris from a skin in the Leyden Museum. Dispar 

 is a much smaller species, and lacks the characteristic 

 median abdominal blotches of farallonii . 



Female. Body, length 2.66 mm., width .84; ground 

 color pale clear brown; strongly and extensively marked 

 with dark brown. 



Head, length .6 mm., width .53 mm.; conical, narrow 

 in front and rounding; five marginal hairs, a long one on 

 dorsal surface between the front two and two shorter ones 

 on dorsal surface near the fourth marginal; trabeculae 

 small and nearly obtuse ; temporal margins rounding and 

 with one long hair and several short prickles ; occipital 

 margin slightly concave ; eyes prominent, with a very 

 short prickle ; antennae short, second segment longest, 

 third and fourth about equal, fifth longer, concolorous 

 with pale ground color of head; clypeal signature dis- 

 tinct, short pentagonal, with hinder margins and posterior 

 angle rounded ; whole head, except small parts of clypeus, 

 pale brown; antennal bands broad, distinct, bending in 

 at suture; small black ocular flecks, and converging oc- 

 cipital bands. 



Prothorax shorter than broad, quadrangular with round 7 

 ing angles ; one long hair and one short thorny hair at 

 posterior angle ; color brown, with darker lateral bands 

 which expand into triangular dark brown blotches in 

 posterior angles. Metathorax broader than long, quad- 



