NEW MALLOPHAGA. I37 



ones, I incline to attribute my specimens to Nitzsch's 

 species rather than to call them new. 



The blotches on the ventral side of the abdomen of the 

 male, described by Piaget and said by Taschenberg to be 

 wanting on his specimens, are plainly present in mine. 

 As both Piaget and Taschenberg figure the male, I figure 

 the female, the head of the male, and an immature male and 

 immature female. This last shows an interesting stage in 

 the formation of the lateral abdominal blotches, there being 

 two blotches on the lateral portion of each segment, which 

 fuse to form the large blotch of the adult stage. The 

 short round abdomen and peculiar marking of the head 

 are also striking. The measurements of the young fe- 

 male figured are: body, length 2.15 mm., width 1.25 

 mm.; head, length .65 mm., width .8 mm. The imma- 

 ture but nearly grown male is as large as the adults. 



GIEBELIA gen. nov. 

 By this name (given in honor of Prof. C. G. Giebel) I 

 would designate a Docop/ionts-Wke form of which several 

 specimens (males and females) of a single species were 

 taken from specimens of the Black-vented Shearwater, 

 Pujfinits opisthomclas. The distinguishing characters of 

 the new genus are its Docofthonts-\\ke form, with very 

 short, broad, suborbicular abdomen (in the single species 

 yet known six-sevenths as broad as long) ; size of body 

 and shape of abdomen same in both sizes; large head; 

 produced rectangular anterior angles of temporal mar- 

 gins with the large eye in the angle; antennas arising in 

 an antennal emargination ; conspicuous trabecular, a trans- 

 parent, semilunar, transversal, membranous flap or process 

 on the forehead with, in the male, a conspicuous, angulated, 

 lateral lobe projecting ovei the lateral margin of the 

 forehead about midway between the trabecular and the 



