CASE 

 XVIII. 



378 ANOPLURA. 



Genus Trinoton {Nitzsch). 



Head triangularly rounded, with a deep sinuosity on lateral 

 margin. 



Nos. Trinoton luridum {Nitzsch). — 10. Specimens; 11. Enlarged figure of ditto ; 

 12. Illustrative vignette (ducks). 



10 — 12. 



Trinoton luridum, from the duck. Anterior \eg of ditto. 



2 lines in length. 



Infests various wild ducks, besides the domestic species. 



Sub-family Ptilopterid^ {Buj-m.). 



Antennae five-jointed ; mouth with strong mandibles. 



Genus Docophorus {Nitzsch). 



The most notable character by which this genus is distinguished 

 is a small movable projection or tooth called a trabecula in front 

 of the antennae, as shown in the woodcut. 

 The only other genus in which this occurs 

 is Nirmus (which has so many other points 

 of coincidence with Docophorus that we 

 should prefer their being consolidated into 



Head of Docophorus semisisj- \ • -vt' ^i ^ i_ i 



ratus (from the carrion crow), ouc geuus) : m Numus thc trabeculae are 



to ihow the trabeculae. ^ 



sometimes, but not always, present ; but when 

 present they are very small and rigid. Nearly all the species of 



