DESCRIPTIONS AXD DETERMINATIONS OF SPECIES 2J 



with one row of four hairs. Third to seventh segments with two hairs 

 near the lateral margin. All the hairs slender and bluntly pointed. 



Pleurites of the first segment apparently lacking, of the second with 

 a slight ventral tooth and two long hairs on the posterior margin. Pleu- 

 rites of the third to sixth segments with a slight tooth at each posterior 

 angle, and with two slender hairs on the posterior margin, the ventral 

 hair being longer. Seventh and eighth pairs of pleurites small, without 

 teeth, and with two long hairs. 



On the ventral side the second to seventh segments each with two 

 rows of six to eight hairs, the third to seventh segments with two hairs 

 near the lateral margin. Genital plate with several small hairs ; gonapods 

 with one short hair and two long hairs, behind each gonapod a group 

 of four or five stout hairs, and a group of several stout hairs at each pos- 

 terior angle of the ninth segment. Vulva fringed. 



Descripition of the Male. — Total length 1.1 mm., length of head 

 .26 mm., length of abdomen .8 mm., width of head .16 mm., width of 

 thorax .24 mm., width of abdomen .4 mm. 



Head and thorax as in the female, except that the third antennal 

 joint bears a pair of short, stout spines, which are not present in the 

 female. 



Abdomen with fewer rows of hairs on the dorsum, the second ter- 

 gite only having two rows. Second to sixth sternite with two rows of 

 hairs, the number and arrangement thruout being practically as in the 

 female. Seventh sternite with but four hairs, of which the median pair 

 are much the longest. Eighth sternite with two long spines. The ninth 

 segment ending in a pair of finger-like processes. Basal plate rather long 

 and slender, about twice as long as the parameres, which are rather stout. 

 Penis long and slender, the arms diverging but little. 



HAEMODIPSUS Enderlein. 



Haemodipsus Enderlein, Zool. Anz., vol. 28, pp. 139-143, (1904). 

 Haematopinns (Polyplax) Neumann, Arch, de Parasit., vol. 13, p. 530, (1909). 

 Haemodipsus Dalla Torre, Genera Insect., Anoplura, p. 15, (1909). 

 Haemodipsus Mjoberg, Arkiv. for Zoologi, vol. 6, no. 13, p. 165, (1910). 



Enderlein's definition of this genus is essentially as follows : 

 Head short, swollen posteriorly, antennae standing far forward. Hind 

 head without lateral projections. Abdomen without sclerites and plates, 

 the outer wall quite smooth. Telson normal. Each of the seven sternites 

 and eight tergites with a transverse row of rather closely spaced, very 



