TWO NEW GENERA OF MALLOPHAGA . 89 



branous flap or fold, thin and uncolored, which rises from about in trans- 

 verse line with the mandibles and projects forward to the point of the cly- 

 peal sutures, and laterally conspicuously beyond the margins of the head ; 

 in these lateral extensions the flap is folded back (towards the head margin) 

 on itself ; eye with rather long hair ; the temples are not much swollen 

 and each bears two long and a few short hairs ; the antennae (Lipeuroid) 

 have the first segment as long as all the others combined and the third 

 segment with an appendage ; the ground color of the head is pale translu- 

 cent yellowish-brown with the clypeal signature, a broad submarginal an- 

 gulated band on each side of head, extending from clypeal suture to base 

 of antennae, darker brown. 



Thorax small ; prothorax with rounded postero-lateral angles with two 

 separated longish hairs in each ; metathorax a little wider and about twice 

 as long, with postero-lateral angles conspicuously produced as thick, taper- 

 ing, blunt pointed, finger-like processes, a long hair rising from base of 

 each process and another not so long and two or three short ones rising 

 from general postero-lateral angular region ; posterior margin of metathorax 

 slightly angulated in the middle and slightly concave in the space between 

 this median angle and the postero-lateral angle ; color pale translucent 

 yellowish-brown with darker rather broad lateral margins. 



Abdomen elongate, rather narrow, subparallel-sided ; segments 1-5 

 each about one half as long as segments 6-8 ; long, flexible curling hairs 

 in postero-lateral angles of segments 2-7, and terminal segment with many 

 short fine hairs ; pale yellowish-brown ground color almost wholly obscured 

 by strong dark to blackish-brown lateral and transversal bands. 



Female. About same size as male but with abdomen wider (.4 mm.) in* 

 the middle and thus not parallel-sided ; ground color of whole body less 

 pale and translucent than in mafe ; head with transversal clypeal flap as in 

 male ; antenna; without appendage on third segment and with first seg- 

 ment shorter than second ; thorax with postero-lateral finger-like processes 

 of meta-segment and with three or four long hairs in postero-lateral region ; 

 abdomen with second segment longest, others about equal among them- 

 selves, and segments 4-6 (in middle of abdomen) wider than others, so 

 that the whole abdomen is elongate elliptical in outline ; last segment with 

 slight angular median emargination on posterior margin. 



NESIOTINUS gen. nov. 



A single female Mallophagan specimen of well-defined char- 

 acter received from Dr. G. Enderlein, of Berlin, proves to be a 

 form which it is impossible to ascribe to any known genus ol 

 the order. This specimen was taken from Aptenodytes longi- 

 rostris, a new penguin species from Kerguelen Id., collected by 

 the German Deep-sea Expedition in 1899. 



