DESCRIPTIONS AND DETERMINATIONS OF SPECIES 3 1 



(C. H. T. Townsend). While the species is, in general appearance, very 

 unlike the others in the genus to which we are referring it, there seem 

 to be no good grounds for considering it as representing a new genus, 

 and it certainly cannot be referred to any other than Haemodipsus among 

 genera so far established. It differs from the other members of this 

 genus in its small head, the shape and size of the pleurites, and the ex- 

 ceedingly small number of hairs on the abdomen. 



Description of the Female. — Total length .7 mm., length of head 

 .12 mm., length of abdomen .55 mm., width of head .1 mm., width of tho- 

 rax .16 mm., width of abdomen .35 mm. 



Head small and quite deeply inserted into the thorax, anterior mar- 

 gin somewhat convex, lateral margins nearly straight, the posterior mar- 

 gin slightly convex. Antennae set slightly in advance of the center of 

 the head ; the first segment not conspicuously enlarged ; the second 

 slightly more slender than the first and a trifle longer ; the third, fourth 

 and fifth subequal; the fourth with the outer posterior angle slightly 

 produced. On each side immediately in front of the antennae there is 

 a small brown patch. Several very small hairs on the anterior margin, 

 a transverse row of four near the front of the head, another of four just 

 in front of the antennae, and another of six somewhat farther back. A. 

 pair of spines about half way between antennae and the occipital margin 

 and slightly in from the lateral margin, the inner being short, the outer 

 longer, reaching slightly beyond the occiput. 



Thorax considerably wider than the head, composed almost entirely 

 of the pronotum, trapezoidal in shape, the lateral and posterior margins 

 nearly straight, anterior margin with a shallow V-shaped groove which 

 ends in a furrow that extends back to the posterior margin of the pro- 

 notum. A short spine in each anterior angle, the posterior margin of the 

 pronotum bearing two short spines close together near the lateral margin, 

 and a median pair of long hairs. First pair of legs small with slender 

 claw; second and third pairs considerably larger, nearly equal in size, 

 and with broad, stout claw. Sternal plate elliptical, the coxae widely 

 separated. 



Abdomen elongated oval in shape, about two-thirds as wide as long, 

 with no chitinized tergal or sternal plates, the body-wall presenting a 

 uniformly reticulated appearance, the divisions between the segments 

 poorly defined. First to eighth segments with a median pair of hairs, 

 close together; those of the eighth being very short, those of the others 

 about as long as the segment. Second to seventh segments with one hair 

 near the lateral margin. Eighth with two long hairs at the posterior 



