SUB-CLASS I. HEMIMETABOLA. Burmeister. 



ORDER II. ANOPLURA. (Leach.) 



Aptera Linne. Antliata, Fabr. Arachnida-Parasita, 

 Latr. Rhophotera, Clairville. Rhynchota, Burmeister. 

 Arachnides Acaridiennes, Lamarck. 



SECTION I. HAUSTELLATA. 



FAMILY I. 



PEDICULID^:. (Leach.) 



Hemiptera Epizoica (Nitzsch). Fam. II. Siphunculata, 



(Lat.) 



ESSENTIAL CHARACTER. 

 Antennae of five joints, mouth with a fleshy Hausteilum. 



NATURAL CHARACTER. 



Apterus, parasitical ; mouth consisting of a fleshy tubu- 

 lous inarticulate haustellum, armed at the extremity with 

 retractile hooks ; legs scansorial, tibiae short thick, armed 

 at the apex on the inner side with a strong tooth, which, 

 together with the large curved tarsus and unguis, forms a 

 claw ; tarsus one-jointed, unguis single ; oesophagus none ; 

 biliary vessels four, free, equal in length, enlarged towards 

 their extremities. Males with two testicles on each side ; 



