I02 THE SCOTTISH NATURALIST 



LAGOPOECUS, Waterst. (1922). 



LAGOPCECUS PALLIDOVITTATUS (Grube) (1843). 



(^ In this alone of the British species is the penis as long 

 as the mesosome. 



Host — Capercaillie, Tetrao urogalhis. 



LAGOPCECUS CAMERATUS (Lyonet) (1829). 



(J The inner lateral edge of the mesosome is simple. 



Host — Black Grouse, Lyriirus tetrix. 



I have had no opportunity of examining Lagopcecus 

 from any Lyriirus other than tetrix to which, so far as 

 I know, L. cameraius is peculiar. 



Lagopoicus affinis (Children) (1836). 



$ The edge of the mesosome is angulate. 



Hosts — Red Grouse, Lagopus scotiais, and 

 Ptarmigan, L. miitiis. 



This species, I believe, occurs on every Lagopus sp. or 

 sub-sp. Its geographical range is thus considerable. I have 

 seen it from Spitsbergen, Britain, Iceland, Eastern-Western 

 Canada, Alaska, and the Aleutian Islands. 



Ninnus nigrescens, Evans (191 2) is a synonym. 



The females of Lagopcecus are somewhat difficult to 

 distinguish and their differentiation is not here attempted. 



LIPEURUS, Nitzch (1818). 



LiPEURUS TETRAONIS, Grube (1843). 



Host — Capercaillie, Tetrao urogalhis. 



Although Grube, in describing this parasite, gives as 

 host both Tetrao and L^agopus it is certain that neither 

 Lagopus nor Lyriirus normally harbour true Lipeurus. Grube 

 was probably deceived by some accidental straggling. 



GONIODES, Nitzsch (181S). 



GONIODES CHELICORNIS, Lyonet (1829). 



Host — Capercaillie, Tetrao urogalhis. 



