ORDER HEMIPTERA 17 



the mouthparts. Furthermore, the heads of members of the 

 former order are usually much more elongate in proportion to 

 the size of the body than is the case in the Mallophaga. The 

 claws of the Parasita are also strongly developed for clasping and 

 clinging to hairs. 



Examine a mounted specimen, using the hog louse (Hcema^ 

 iopinus suis} as an example of the order, and note the distinctions 

 above mentioned. 



The proboscis of the sucking louse is fleshy and un jointed, sur- 

 rounded at its base by a circlet of barbs, and is in the form of an 

 extensile tube provided with lancets. The legs are short and 

 stout, and the tarsus is provided with a strong opposable claw. 



Draw the specimen, showing the general structure. 



EXERCISE 7b 



ORDER HEMIPTERA, SUBORDER PARASITA, FAMILY PEDICULIDJE 



Systematic Study. 



The Suborder Parasita includes two families, only one of 

 which needs to be considered here. The other family is Oriental, 

 and is found solely on bats. 

 Family Pediculidae. 



Genus Pediculus, examples, P. capitis, the head louse of man, 

 and P. vestimenti, the body louse of man. 



Genus Phthirius, example, P. inxuinalis. the crab louse of man. 



Genus Haematopinus, examples, H. piliferus, the sucking 

 louse of the dog, H. suis, of the hog, H. macrocephalus, the 

 horse louse, and H. spinulosus, the sucking louse of the rat. 



Examples of the Genus Haematopinus having been drawn 

 previously, make large drawings of one example each of the 

 genera Pediculus and Phthirius. 



