16 THE SCOTTISH NATURALIST 



Genus Pediculus Linnaeus. 



Head short. Legs all of approximately the same size. 

 Abdomen elongated. Spiracles small. Abdominal segments with- 

 out lateral projections, and with numerous small spines. 



i. P. capitis De Geer. From Man (Homo sapiens). 



2. P. corporis De Geer. From Man (Homo sapiens). 



Genus Phthirins Leach. 



Anterior legs much smaller and with much slenderer claws than 

 the others. Abdomen short and broad, the fifth to eighth segments 

 with conical lateral processes. Spiracles large, those of the first 

 three abdominal segments crowded close together. 



3. P. pubis Linnaeus. From Man (Homo sapiens). 



Family H/EMATOPINID.E. 



Eyes lacking. Antennae five-segmented. Tibiae with a thumb- 

 like process opposing the claw. 



Subfamily H/ematopinin^e. 



Anterior legs of practically the size of the others. A triangular 

 skeletal piece (pretarsal sclerite) present between tibia and tarsus. 



Genus Hematopinus Leach. 



Head with very sharp, forward-pointing temporal angles. 

 Thorax broad. Legs all of practically the same size, with a strongly 

 chitinized skeletal piece between tibia and tarsus. Abdomen with 

 a swollen, pad-like, chitinized area on the lateral margins of the 

 third to eighth segments. Tergites and sternites with a varying 

 number of small chitinized plates. Each tergite and sternite with 

 one transverse row of very small hairs. 



Recorded from Perissodactyla and Artiodactyla. 



4. H. asini (Linnaeus). From Domestic Horse (Equus caballus) 



and Ass (Equus asinus). Var. colorata Piaget. From 

 Domestic Ass (Equus asinus). 



5. H. eurysternus (Nitzsch). From Domestic Cattle (Bos 



taurus). 



6. H. suis (Linnaeus). From Domestic Pig (Sus scrofa 



domestical). 



Subfamily Linognathin/E. 



Anterior legs always distinctly smaller and with much slenderer 

 claw than the posterior. No skeletal piece (pretarsal sclerite) 

 between tibia and tarsus. 



