NEW MALLOPHAGA. 83 



segment; segment 9 narrowly emarginate, with two i>ale 

 brown blotches, 



Nirmus opacus n. sji. (Plate VI, fig. 6). 



Several specimens from two individuals of the Semi- 

 j)al mated Plover, ^Egialitis serai pal nuda (Pacific Grove, 

 California). The new species belongs to the group 

 bicuspidati (Piaget, Les Pediculines, p. 184), being in 

 size, outline and marking much like bicuspis N, (Giebel, 

 Insecta Epizoa. p. 155, pi. v, figs. 11 and 12; Piaget, 

 Les Pediculines, p. 184, pi. xv, fig. 7) from "Charadrius 

 minor," C. hiaticula and Recurvirostra avocetta. 



Description of the male. Body, length 1.11 mm., 

 width .47 mm.; body dark colored all over, with nar- 

 row black lateral abdominal bands. 



Head, length .4 mm,, width .31 mm.; elongate-coni- 

 cal, with broad, rounding front; uncolored clypeal 

 region slightly expanded in front of the suture; five 

 marginal hairs, one in the rounding anterior angle, 

 one just behind this, one at the suture, and two before 

 the trabecuhe; a few dorsal hairs project beyond the 

 margin; trabecula3 distinct, rather slender, acute, prom- 

 inent for Niviitvs; antennte short, not reaching the 

 occipital margin when projected backward, segment 2 

 longest, segments 3 and 4 short, slibequal, segment 5 

 louixer, concolorous with ground color of the head; eves 

 flat, with a long hair and a fine prickle; temporal mar- 

 gins flatly rounding, with two long hairs and two 

 prickles; occipital margin straight; front of clypeus 

 uncolored; signature large, colored, shield-shaped, 

 from its posterior point a narrow uncolored line runs 

 backward to the mandibles or beyond; antennal bands 

 distinct, blackish brt^iwii. interrupted at suture, the part 

 behind the suture (.urvini;, with anterior extremitv 



