■260 MR. B. F. CUMMINGS OIST LICE 



as in the preceding species. The posterior lateral processes, 

 Tiowever, are less developed, and the posterior margin of the 

 ■expanded posterior end is only slightly concave. 



Parameres : These are of a remarkable type (text-fig. 2). 

 Proximally they are broad blade-like pieces which meet each 

 •other (but do not fuse) beneath the mesosome in a fairly long 

 median groove, then dorsally wrap themselves ax^ound the 

 mesosome lying between them, forming a kind of sheath, from 

 the end of which the penis projects, and, like the somewhat 

 narrower distal ends of the parameres, curls up dorsalwards. 



Penis : As in L. cavice-capensis, this ends in a loop-like aperture, 

 of much smaller size, relatively. On each side of it may be 

 ■discerned, under a high power, a small telomere, the three 

 together forming a complex, running backwards into a broader 

 basal part between the parameres. 



The part " E " I regard as the endomeral part of the copulatory 

 tube. These parts are reconsidered on p. 266. 



LiNOGNATHUS TIBIALIS (Piaget) (2, p. 646). 

 6 5 $ from an unrecorded host. 



LiNOGXATHUS GAZELLA Mjoberg (4, p. 157). 

 5 5 $ from an unrecorded host. 



LiNOGNATHUS PiTHODES, sp. n. (Text-figs. 3-5 ) 



1 S 6 and 12 5 5 from the Indian Antelope Antelope cervi- 

 ■capra Linn. Lucas described a variety of L. tibialis from the 

 same host (Ann. Soc. Ent. France, 1847, p. 534). 



The species about to be described may at once be distinguished 

 from all other members of the genus at present known by the 

 presence on the abdomen of the male of a segmental series of 

 tergites, each possessing a row of closely placed spines or 

 " thorns," short and very thick, and set in a perfectly straight 

 alignment (see text-fig. 3). The trefoil-shaped appeai-ance of 

 the posterior end of the abdomen in the male is also an obvious 

 character for the species. 



The genus Liaognathus has hitherto been in part defined by 

 the absence of abdominal sclerites ; but, as in other respects the 

 new species is typically linognathoid, it is better to expand the 

 diagnosis of the old genus than to create a new one. 



External Form. Male. — A stout insect with a large tun- 

 shaped abdomen. Head : Short and broad, almost as broad as 

 long, extending only a little beyond the anteniife. In front the 

 head is truncate and broad, the lateral angles rounded. Mouth 

 opens ventrally in the middle of a circle of broad-banded chitin, 

 the anterior semicircle of which runs across the dorsal sui^face 

 of the truncate front of the head and then down on each 

 side, the posterior semicircle being composed of thinner chitin. 

 The post-antennal region of the head is a little broader than the 



