382 



ANOPLURA. 



CASE 

 XVIII. 



Nos. 

 45-47- 



Lipeurus variabilis (from 

 the fowl). I to I line in length. 



Lipeurus squalidus (from the 

 duck). \ to i\ line in length. 



Lipeurus variabilis 

 {Nitzsch). — 45. Speci- 

 mens ; 46. Enlarged 

 figure of ditto ; 47. Illus- 

 trative vignette (newly 

 hatched domestic chick- 

 ens). 



Infests the domestic 

 fowl. 



Lipeurus squalidus 

 {JSIitzsch). 



Infests the duck. 



Nos. 

 48-50. 



Nos. 

 51—53- 



Lipeurus jejunus {NitzscJi). — 48. Specimens; 49. Enlarged figure of ditto ; 

 50. Illustrative vignette (geese). 



Infests the goose. 



Lipeurus polytrapezius {Nitzsch). — 51. Specimens ; 62. Enlarged figure of 

 ditto ; 63. Illustrative vignette (teal). 



Common on the turkey. " Their mode of progression," says 

 Mr. Denny, *' is rather singular as well as rapid. They slide, as 

 it were, sideways, extremely quick from one side of the fibre of a 

 feather to the other, and move equally well in a forward or retro- 

 grade direction, which, together with their flat, polished bodies, 

 renders them extremely difficult to catch or hold." He has 

 observed, he also remarks, " that when two or more genera infest 

 one "bird, they have each their separate localities, for while the 

 Goniodes stylifer will be found on the breast and neck of the bird. 

 the Lipeurus polytrapezius will be congregated in numbers on the 

 webs and shafts of the primary wing feathers." 



Genus Ornithobius {Denny), 



Scarcely differing from Nirmus, except in having two horns to 



the clypeus. 



