NEW MALLOPHAGA. 537 



Description of the male. Body, length 1.8 mm., 

 width .62 mm. ; pale, clear, yellowish brown, with small 

 black ocular flecks, slightly darker thorax, indistinctly 

 indicated lateral bands, parallel inner logitudinal bands, 

 and numerous short, stiff, spiny hairs on dorsal surface of 

 abdomen. 



Head, length .35 mm., width .55 mm.; not so much 

 wider than long as usual in Menopon ; forehead or region 

 in front of ocular emargination long; front flatly rounded, 

 with a few short hairs and two longish ones, one longer 

 than the other on a slight swelling in front of the ocular 

 emargination; the ocular fringe distinct, composed of 

 curving, stiff hairs; temples with anterior angles some- 

 what produced, and four long and two or three short 

 hairs on the margin; small black ocular flecks; weakly 

 colored, translucent, narrow, curving, ocular blotches, 

 and a weakly colored region outside of each mandible; 

 occipital margin medially, narrowly, weakly colored, 

 translucent, with two short median hairs and a shorter 

 one at each side of these two. 



Prothorax hexagonal, almost as long as broad, the 

 lateral anterior sides short, the lateral angles obtuse, but 

 little produced, with two spines and a short, stiff hair; 

 posterior margin slightly angulated in the middle, and with 

 six longish hairs, the terminal one being in the posterior 

 angles of the segment ; whole segment slightly darker than 

 the head, with short, transverse, uncolored, chitin bar. 

 Metathorax with lateral emargination and faint sutural line 

 between meso- and metasegments : lateral margins bare ; 

 posterior angles with two spines and the terminal one of a 

 series of submarginal hairs which are ranged along the 

 straight or very weakly convex posterior margin; an- 

 terior angles and lateral margin slightly darker, but 

 otherwise the whole segment concolorous with prothorax. 



Proc. Cal. Acad. Sci., 2d Ser., Vol. VI. ( 37 ) November 13. 1890. 



