KEY TO FAMILIES. SUBFAMILIES AND GENERA 



III 



KEY TO THE FAMILIES, SUBFAMILIES AND GENERA OF 



THE ANOPLURA 



1. Occurring exclusively on land mammals 4 



Occurring exclusively on marine mammals (seals, sea- 

 lions and walruses) . Family ECHINOPTHIRIIDAE . . 2 



2. Antennae five-segmented, thorax and abdomen bearing 



scales Genus Antarctophthirus 



Antennae four-segmented 3 



3. Thorax and abdomen bearing scales. Genus Lepidophthirus 

 Thorax and abdomen without scales . Genus Echinopthirus 



4. Head much elongated, cylindrical in shape ; tibiae 



without a thumb-like process opposing the claw 



Family HAEMATOMYZIDAE 



(Containing but one genus, Haematomyzus, oc- 

 curring on elephants.) 

 Head not elongated ; tibiae with a thumb-like process 



opposing the claw 5 



5. Eyes extremely rudimentary or entirely lacking . . 



....... Family HAEMATOPINIDAE . . 9 



Eyes present, well pigmented . Family PEDICULIDAE . . 6 



6. Antennae five-segmented (on apes and man) . . . 



Subfamily Pediculinae . . 8 



Antennae three-segmented (on monkeys) .... 



Subfamily Pedicininae . . 7 



7. Legs all of same size Genus Pedicinus 



Middle and posterior legs larger and stouter than an- 

 terior Genus Phthir pedicinus 



8. Legs all of same size Genus Pediculus 



Anterior legs smaller than the others . . Genus Phthirus 



9. Antennae five-segmented n 



Antennae three-segmented Subfamily Euhaematopininae . . 10 



10. Posterior legs with stalked, disk-shaped appendages 



on femur and tibia .... Genus Euhaematopinus 

 Posterior legs without appendages Genus Haematopinoides 



11. Anterior legs smaller than posterior 



Subfamily Linognathinae . . 12 



