36 Jamrs Wäterston, 



slight difflcult}^ in namiiig' the $ from Charadrius minor (= dubius), 

 L. baculus and the points he mentions (he absence of the clj^peal 

 spines and the marked pointing of the lobes of the terminal segment) 

 confirm the suspicion that he was really dealing with our peculiar 

 Nirmus whose hosts are probably various species of Charadrius. 

 Whether and how far it varies are yet to be determined. 



Gen. Lipeuriis Nitzsch (1818). 



Lipeiiriis tnutabilis Piaget (1880). 

 L. nnäabilis, Piaget, Les Pediculines, p. 324, tab. 27, fig. 1 (1880). 



cJ, 4 $$. Fulmarus glacialis. 



Gjanoyri (Strömö), 11./8. 1912. K. Schreiber leg. 



Like many other tubinarial hosts. tlie Fulmar Petrel has yielded 

 more than one species of Lipetirus. The 5 examples collected by 

 Dr. Dampe belong to the species typically found in Shetland on this 

 bird. Its nanie we consider is Lipeiirus mutabilis Piaget. We 

 suggest that L. varius Kellogg (New Mallophaga, pt. 1, p. 116, tab. 7, 

 figs. 3, 4, 1896) is the juvenile phase of L. celer Kellogg (1. c, p. 117, 

 tab. 7, flgs. 5, 6) and that both are equal to L. mutabilis P. 



Stephens (Syst. Cat., pt. 2, 333) mentions a L. bilineatus from 

 the Fulmar and to one familiär with the early stages of mutabilis 

 the name is suggestive. Unfortunately bilineatus must now be 

 regarded as a nomen nudum, as the Hon. N. C. Rothschild 

 M. A. who kindly made enquiry at our request, informs us that the 

 type is no longer extant. Nor has any description of Stephens, 

 insect ever appeared so far as we know. In these circumstances 

 it might seem unnecessary to discuss further the identity of bilineatus. 

 But an interesting fact has emerged during the writers investigations. 

 Various considerations pointed to bilineatus being probably the normal 

 Lipeurus oi Fulmarus glacialis. Piaget (Les Pediculines, p. 324) sug- 

 gested it is a synonym of liis grandis [Thalassidroma pelagica). We 

 have examined three specimens of T. pelagica feather by feather 

 without finding any other Lipeurus than Denny's pelagicus (Monogr. 

 Anopl. Brit., p. 173, tab. 14, fig. 2, 1842) of which Piaget's sub- 

 angusticeps (Les Pediculines, p. 308, tab. 25, fig. 5, 1880) is almost 

 certainly a synonym. We are inclined to doubt therefore of the 

 Storm Petrel is a normal host of L. grandis P. and our hesitation 

 is reinforeed by the fact that tlie bird from whith Piaget secured 



