new Species of Lice. 105 



On the ventral surface of the last segment are scattered a 

 large number of very elongate bristles. Cboetotaxy else- 

 where difficult to analyse with certainty : apparently five 

 transverse rows of well-spaced thin hairs. 



Chwtotaxy. Female. — Abdomen : there are at least two 

 long hairs on the median dorsal area of each segment except 

 the last. On each of the lateral tergites 2 to 6 there is along 

 the posterior margin a single elongate bristle (present also in 

 the c^). A pair of elongate straight bristles on the terminal 

 margin of the abdomen. 



Ventrally, at the base of tlie abdomen four widely-spaced 

 hairs, the two middle ones very long. A row of seven or 

 eight well-spaced hairs on the next five segments. Posterior 

 segments covered by genital plate, which is bare except for 

 the hind marginal fringe and a few minute pale hairs along 

 the longitudinal furrows lying one on each side of the plate. 

 Five stout bristles on each gonopod. Between the gonopod 

 and the lateral margin three elongate bristles, two in front 

 and one behind. 



Male Copulatory Ap]-)aratus (fig. 6J. — The male copu- 

 latory apparatus presents several interesting features. In the 

 description which follows the attempt which has been made to 

 homologize the parts must be regarded as merely tentative. 

 The apparatus in this species is specialized, and rather difficult 

 to interpret without intermediate species — forthcoming, 

 perhaps, in other parrot parasites of the genus. 



Basal plate delicate, thin, transparent, quadrilateral. 

 The rest of the genitalia are strongly chitinized and deep 

 brown in colour : — 



Parameres. — I regard as parameres tlie two broad blades 

 which articulate with the middle part of the posterior margin 

 of the basal plate, and overlie, so as almost to completely 

 hide from view, the rest of the genitalia. Usually the para- 

 meres are attached laterally. Each paramere is elegantly 

 curved on the outer margin and narrows to a slender tip, 

 where a directive hair is situate. 



Mesosome. — On each side of tlie parameres and articulated 

 to the posterior lateral angles of the basal plate is a 

 smaller piece shaped somewhat like a rabbit^s ear. In 

 rather close connexion with this piece, but attached to the 

 basal plate ventrally so as to be quite hidden by the 

 parameres, is still another appendage, narrow, rod-like, half 

 as long as the paramere, and with a toothed lower edge. 

 These two shorter appendages on each side — one dorsal and 

 one ventral — may represent the endomeral parts of the meso- 

 dorae. The lie v. J. Waterston has pointed out to me that 



