CLASS V. INSF.CTA. 143 



Sp. 3. Fed. cervicalls. Body oval, lobcd, cinereous, with a black inter- 

 rupted band on either side. 



Le Pou ordinaire. Geoff. PedicuUis humanus. vai\ Lbm. Pediculus 

 cervicahs. Lntr., Leach. 



Inhabits the heads of man throughout Europe. In Britain it is ex- 

 tremely common, especially in the heads and upper part of the 

 necks of children, whence they are extracted by means of a fine- 

 toothed comb, or are destroyed by rubbing calomel mixed with a 

 little fat amongst the roots of the hair. This species has been by 

 many authors confounded with the preceding species. 



Genus 8. H/EMATOPINUS. Leach. 

 Thorax narrow and distinct from the abdomen : abdomen verj' broad. 



Sp. 1. Ham. Siiis. 



Pediculus Suis. Linm. Ilrematopinus Suis. LeacKs Zool. Misc. iii. 66. 



pi. 146. 

 Inhabits swine. 



Fam. II. Nir.MiD.c. Leach. 



Mouth with a cavity, and two teeth or mandibles. 



Genus 9. NIRMUS. Hermann, Leach. RrciNus. De Gecr, OUv., 

 Lam., Latr. Pediculus. Linn., Geoff., Fahr. 



The character of this genus is given in that of the tribe. All the 

 species inhabit birds. The term ricinus having been used in botany 

 is rejected, and that of Dr. Hermann's is adopted. 



Sp. 1. Nir. Curnicis. Whitish: head heart-shaped; segments of the 

 thorax on each side produced into a tooth : abdomen oval, trans- 

 versely banded with brown. 



Ricinus Cornicis. Lair. 



Inhabits the Corvas Comix of Linne. 



Subclass II. INSECTA METABOLIA. 

 Order III. COLEOPTERA. 



Order Coleoptera. Linn., Cuv., Lam., Lntr., Sfc. 

 Class Eleuterata. Fabr. 



This Order is divided into five great sections, from the general num- 

 ber of joints in the tarsi. 



Section I. — Pentamera. 



The number of joints in the tarsi is generally five, but in some of 

 (lie aquatic genera the nupabcr is less. 



