PSE UDOXE CROP PEP A. 



35 



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. LffiMOBOTHRIUM. 

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

 labrum. 9. Physostomim. 



CC. Mesothorax present. 



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

 concealed. 10. TRINOTUM. 



DD. Mesothorax small, only indicated. 



E. Orbital sinus deep ; antennae usually elongated and visible. 



II. COLPOCEPHALUM. 



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: 



1. TriCHODECTES. — Trichodectes hit us (Fig. 79), dog; T. rostrdtus, cat; T. 

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

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





Fig. 79. — Trichodectes Fig. So. — Tricho- Fig. 8i. — Trichodectes Fig. 82. — Goniodes styli/er. 

 latus. (From Law.) dectes spheroce- scalaris. (From Law.) (From Law.) 



fhalus. (From 

 Law.) 



2. D0COPH0RLS. — Docophorus aJustus, goose; D. ict erodes, duck. 



3. Nirmus. — Xirmus clavccformis, pigeon ; N. numidce, Guinea-fowl ; X. 

 tesselldttis, duck. 



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

 rectanguldtus, peacock ; G. chrysocephalus, pheasant ; (7. hologaster, hen. 



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



