PSE UDONE UROP TERA . 8 5 



AA. Antennae clubbed, four-jointed ; maxillary palpi long, filiform, four-jointed. 

 B. Tarsi with two claws. Parasites on birds. 



C. Mesothorax wanting ; antennae always concealed. 



D. Head very broad ; no orbital sinus. 7. EUREUM 



DD. Head elongated, with lateral angles directed backwards. 

 E. With sharply marked off cypleus, and shallow orbital sinus. 



8. LjEMOBOTHRIUM. 



EE. With only wavy head-margins, and long lateral lobes on the 

 labrum. 9 . PHYSOSTOMUM. 



CC. Mesothorax present. 



D. Mesothorax large, sharply marked off ; head three-sided ; antennae 

 concealed. Io . TRINOTUM. 



DD. Mesothorax small, only indicated. 



E. Orbital sinus deeps antennae usually elongated and visible. 



II. COLPOCEPHA^UM. 



EE. Orbital sinus very shallow or obsolete, antennae concealed. 



12. MENOPON. 

 BB. Tarsi with a single claw. Parasites on mammals. 13. GYROPUS. 



The following is a list of the described species of the Mallophaga which 

 infest domestic animals ; in each case the host is indicated : 



i. TRICHODECTES. Trichodectes Idtus (Fig. 79), dog; T. restrains, cat; T. 

 equi (Fig. 78), horse and ass; T. breviceps, llama; T. climax, goat; T. sphero- 

 cephalus (Fig. 80), sheep; T. scalaris (Fig. 81), ox. 



FIG. 79. Trichodectes 

 latus. (From Law.) 



FIG. 80. Tricho- 

 dectes spheroce- 

 phalus. (From 

 Law.) 



FIG. 81. Trichodectes 

 scalaris. (From Law.) 



FIG. te.Goniodes styliftr. 

 (From Law.) 



2. DOCOPHORUS. Docophorus adustus, goose ; D. icterodes, duck. 



3. NIRMUS. Ntrmus clavaformis, pigeon ; N. numidce, Guinea-fowl ; N. 

 tesselldtus, duck. 



4. GONIOCHOTES. Goniochotes compar, pigeon; G. sp., Guinea-fowl; G. 

 rectanguldtus, peacock ; G. chrysocephalus, pheasant ; G. hologdster, hen. 



5. GONIODES. Goniodes numididnus, Guinea-fowl; G. stylifer (Fig. 82), 



