544 



MEDICAL ENTOMOLOGY 



Abdomen more or jess elongated. Pleura of the third to the 

 sixth segments each provided dorsally and ventrally with 

 a long, pointed, knife-like process, which may have one 

 or two hook-like teeth in front of the point. Fourth to 

 the seventh tergite and sternite each made up of three short 

 secondary segments, each of which is provided with a 

 transverse row of long, scale-like, broad and flat hairs. 

 Third tergite and sternite consisting of two rings each, of 

 which the anterior is the broadest ..... 



14. Each sternite and tergite of the abdomen with two or three 



transverse rows of very long and closely set hairs. Stig- 

 mata especially large. Middle and hind legs nearly equal 

 in size. Head slender or very slender. Proboscis very long. 

 Each sternite and tergite of the abdomen with one transverse 

 row of hairs ......... 



15. Stigmata especially small, not raised above the hind borders 



as tubercles. Middle and hind legs nearly equal in size. 

 The hairs very long. Abdomen elongated, lateral borders 



entirely smooth and without spines 



Stigmata moderately large, those of the abdomen raised like 

 tubercles, and standing out above the hind border. Abdo- 

 men relatively broad and rounded, lateral borders with 

 one strong spine behind each projecting stigma. Claw of 

 the foreleg very long and pointed ..... 



16. Femur and tibia of the hind leg bear rectangular, projecting, 



stalked, sheath-like appendages ...... 



Hind legs normal. Posterior side of the end joint of the 

 antenna deeply hollowed out. Abdomen with strongly 

 chitinized pleura, which broaden out posteriorly and over- 

 hang the next segment ; on this account the lateral 'borders 

 of the posterior part of the body appear serrate 



Hoplopleura. 



Linognathus. 



15 



Haemodipsus. 



Solenopotes. 

 Euhaematopinus. 



Haematopinoides. 



FAMILY PEDICULIDAE, ENDERLEIN 



Body flattened. Head without tube-like projection anteriorly. Probos- 

 cis short, barely reaching to tJie thorax. Pharynx short and broad. 

 Fttlturae "very strong and very broad, with broad arms. Eyes large, 

 Prominent and distinctly pigmented. Antennae three or five-jointed. 

 Stigmata on each side of the mesothorax only, and on the third to eighth 

 abdominal segments. Legs formed for clinging. Tibia and tarsus 

 generally short and thick. Tibia with thumb-like 'process. (Dalla 

 Torre). 



This family is of special interest, as it contains the lice which are 

 parasitic on man and monkeys. It is divided by Enderlein into two 

 sub-families, Pediculinae, with five-jointed antennae, and Pedicinae, in 

 which they are three-jointed. The Pediculinae contains two genera, 

 Pediculus and Phthirus ; the Pedicinae includes only Pedicinus. 



