LINOGNATHINm 



759 



1 817, is found on Sus scrofa Linnneus; other species are found on equines, 

 bovines, camels, antelopes, deer, conies, and monkeys. 



Subfamily LiNOGNAXHiNiE Enderlein, 1904. 



This subfamily contains five genera, which may be recognized as follows :— - 



A. Abdomen with strongly chitinized tergites, sternites, and pleurites. 



Tergites and sternites partly subdivided. Pleurites extended back- 

 wards and outwards, making sides of abdomen segmented. Hind 

 legs stronger than middle legs. Claw of hind leg short and much 

 compressed, and fittable into tarsus. 



I. Abdomen elongated; 4-7 sternites and 2-7 tergites, divided into 

 two plates lying one behind the other. Each plate with a 

 transverse row of strong long hairs. Pleura without ser-rated 

 process on the inner side. Stigmata small — Polyplax Ender- 

 lein, 1904. 



II. Abdomen more or less elongated. Pleura two to six, provided 

 with a dorsal and ventral long knife-like pointed process. 

 Four to seven tergites and sternites, composed of three 

 secondary segments, each with a transverse row of long broad 

 scale-like hairs; third tergite and sternite composed of two 

 rings each. Anterior ring is broader than po.sterior— //o/'/o- 

 pleuya Enderlein, 1904. 



B, Abdomen without sclerites, with smooth border. Hind legs same 



size as middle leg : — 

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

 transverse rows of very long closely set \idaxs~Linoqnathus 

 Enderlein, 1904. 



II. Each sternite and tergite of the abdomen with one transverse 

 row of hairs : — 



[o.) Stigmata large, and those on the abdomen raised like 

 tubercles and standing out above the hinder border of 

 that segmented — Solenopoics Enderlein, 1904. 



(b) Stigmata very small, and not raised as tubercles — Hcemo 

 dipsus Enderlein, 1904. 



The genus Polyplax contains a rapidly increasing num.ber of species. The 

 one illustrated in Fig. 372 is P. spinulosa (Burmeister, 1839), V\'hich is found 

 on Epimys novve^'icus Erxleben, 1777, in Europe, 



Subfamily C: Euh^matopinin^ Enderlein, 1904. 



This subfamily has two genera with one species, and this can be recognized 

 as follows: — 



A. Hind legs with femur and tibia armed with projecting rectangular, 



stalked, sheath-like appendages — Euhcsnia/opinus Osborn, 1896. 

 Species: E. abnormis Osborn, 1896, on Scalops aygenfatwy in North 

 America. 



B. Hind legs normal — Hcsmatopinoides Osborn, 1891. 



Species: H. squamosus Osborn, 1891, on Geomys bursanus in No'*th 

 America. 



Remaining Families. 



The family EchinobthiviudcB Enderlein, 1904, contains three genera — 

 viz., Antarctophthirius Enderlein, 1904. — with two species, Echinophthivius 

 Giebel. 1871, with three species, and Lepidothirius Enderlein, 1904, with only 

 L. macrovhini Enderlein, 1904. 



The family Hcsmatomyzidcs Enderlein, 1904, contains one genus, Hcema- 

 iomyzus Piaget, 1869, and one species, H. elephantis, on the Ceylon elephant 



