196 



VERMIN IN THE SKIN. 



Class. 

 INSECTA (Insects.) 



Sub-Class. 



HEMIMETABOLA 



(undergoing an imperfect 



metamorphosis.) 



Hub-Class. 



METABOLA 



(undergoing a perfect 



metamorphosis.) 



Order. 

 THYSANOURA 



(Springtails). 



Order. 

 ANOPLURA 



(Lice). 



Sub-Order. 



MALLOPHAGA vel MANDIBULATA. 



Mouth with two horny 



mandibles. 



I 

 Family. 



PHILOPTERIDJE. 



I 

 Genus. 



TRICHODECTES. 



I 

 Species. 



Sub-Order. 



RHYNCHOTA vel HAUSTELLATA. 



Mouth with a tubulose very short 



haustellum. 



I 



Family. 



PEDICULID^E. 



I 

 Genus. 



HJSMATOPINUS. 



T. Equi, . . 

 T. Scalaris, . 

 T. Sphaerocepha- 

 lus, . . . 

 T. Lutus, . . . 

 T. Subrostratus , 



Louse of Horse. 

 Louse of Ox. 



Louse of Sheep. 

 Louse of Dog. 

 Louse of Cat. 



< 



Species. 



H. Eurysternus, . Louse of Ox. 

 H. Vituli, . 

 H. Asini, . 

 H. Suis, .. 

 H. Piliferous, 



H. Stenopsis, 



Louse of Calf. 

 Louse of Ass. 

 Louse of Pig. 

 Louse of Dog. 

 Louse of Goat. 



