NEW MALLOPHAGA. 51 



drius very closely resembles the common melanocefihalus 

 of the Terns. 



Description of the male. Body, length 1.62 mm., 

 width .65 mm. ; head and thorax smoky golden brown, 

 abdomen'dark brown with black markings. 



Head, length .60 mm., width .53 mm.; front convex 

 with a narrow uncolored border, and a short hair in each 

 anterior angle; one short, marginal hair in front of the 

 distinct suture, and two behind it; trabecular medium ; eye 

 inconspicuous, with a short hair; temporal margins with 

 two hairs; occipital margin straight, bare; signature 

 shield-shaped, pale, with acuminate posterior point darker 

 colored ; quadrangular space in anterior part of signa- 

 ture slightly darker colored than rest of signature ; angu- 

 lated antennal bands, their continuations in front of the 

 suture as narrow marginal borders, the diverging occipital 

 bands and the marginal temporal borders dark brown ; also 

 a narrow occipital border not extending to the sides of 

 the head and interrupted medially. 



Prothorax, short, with slightly diverging sides and flatly 

 convex posterior margin; posterior angles with a single 

 hair; color smoky golden brown, with a dark brown 

 lateral border, extending around the posterior angles, 

 and a little way along the posterior margin. Metathorax 

 short, broad, with widely diverging short sides, and 

 broadly parabolic posterior margin thickly set with a se- 

 ries of pustulated hairs. Sternal markings consisting of 

 dark brown intercoxal lines, a pale median prothoracic 

 blotch, and a small, pale, triangular metathoracic blotch. 

 Legs, fuliginous with narrow dark brown to black mark- 

 ings. 



Abdomen, broadly ovate, turbinated; segment 2 with 

 specially prominent, acute, projecftng, posterior angles; 

 segments 4-8 with one to two hairs in posterior angles; 



Peoc. Cal. Acad. Sol, 2d Ser., Vol. VI. ( 6 ) March 11. 1896. 



