38 James Waterston, 



a feral condition the hosts of tliis group ming-le freely so tliat with 

 the same host before one there is iio guarantee that one is dealiog 

 with the same parasite that a fellow worker has foimd elsewhere. 

 Only very careful descriptions or preferably a thorough collation of 

 types can elucidate the present confusion. 



We have calied these Brent Goose Lipeurus, Hemporalis'^ because 

 of their general agreement with series of the genus taken on Mergus 

 serratar (Shetland etc.) but we have no feeling of satisfaction with 

 this determination. Eeic MjOBEEa (iu: Aik. ZooL, Vol. 6, No. 13, 

 p. 91, 1910) records both jejunus N. and temporalis N. from JBranta 

 hernicla. 



Subord. Amblycera. 



Farn. Liotkeidae. 



Gen. Colimcephalu^n Nitzsch (1818). 



Colpocephaliun (ßvandicejis Piaget (1880). 



C. grandiceps, Piaget, Les Pediculines, p. 558. tab. 46, fig. 7 (1880). 



3 cJ(^, 2 ??, 2 imm. Haematopus ostralegus (3 expl.). 

 Langesand, Gjanoyri (Strömnses) 3., 13.,15./8.1912. K.Schreiber leg. 

 This like C. mnhrinum P. is sexually a very distinctly dimorphic 

 form. 



ColpoceiyJudunti iifnhrimini Piaget (1880). 

 C. umbrinum Piaget, Les Pediculines, p. 556, tab. 46, fig. 6 (1880). 



11 immatnre specimens. Tringa maritima. 



Gjanoyri (Strömö), 15./8. 1912. K. Schreiber leg. 



These examples are perhaps not strictly determinable but after 

 careful examination we venture to assign them to the above species. 

 C. umbrinum — varying slightly in size — seems characteristic of 

 hosts of the genus Tringa. We have seen it from Camitus canuius 

 (Shetland) and also from Erotia suharquata (South Africa) but 

 curiously never on Arquatella maritima though we have examined 

 over a score of this bird with some attention. 



