new Species of Lice. 95 



sac-likf, witliont any external sii^ns o£ seo;men(ation excei^t 

 in tlie cJ . In this sex there is a i)air of ratlier lari^e pleurite.s 

 on the two basal segments ; on each of the others, up to 

 the seventh, a pair of small, narrow, chitinous slips situated 

 transversely in the pleural region on each side. In the ? 

 these slips are absent, but there are two pairs of lari^e 

 plenrites at the base ajid one j)air at the end, on the penulti- 

 mate segment ot" the abdomen. 



Kxternal Form. Alale. — Head : fig. 2 is an accurate 

 representation of the outline of the head, and makes un- 

 necessary the usual circumlocutionar}' phrases. The notable 

 features are the rather deep semicircular frontal sinus (which 

 has a deep marginal band of dark brown chitin divided into 

 two parts by a median longitudinal line), the large size of 

 the basal segment of the antenna, and a gular plate (see 

 fig. 3, GP) broader than long, lying between the two longi- 

 tudinal bands that run forward on the ventral surface of the 

 skull*. 



There are two small circular sensoria close to2:ether on the 

 ventral surface of the third segment of the antenna. 



Thorax: the parts w^ere too crushed to allow of description. 

 Apparently it resembles that of the ? closely. 



Abdomen : the first two pairs of pleurites are large plates 

 with a firm outer but an irregular iimer margin, the second 

 pair a little smaller than the first, both of a deep brown 

 colour. On the succeeding segments the pleurites are small, 

 thin, transverse slips. At the posterior end of the last 

 segment are two lobes forming the hind margin of the 

 segment and apparently the posterior lip of the genital 

 opening. 'I'hese two lobe-like pieces are rounded and white, 

 covered with short bristles ; they run in towards one 

 another, but do not meet. Two brown bands of chitin 

 run forward on the ventral surface as far as halfway to the 

 base of the abdomen, one on each side of the copulatory 

 apparatus, which is seen through the transparent integument. 



The above description is necessarily incomplete, and may 

 have to be emended in some respects when new and better- 

 preserved material is forthcoming. 



Exiernal Form. Female (fig. 8). — The usual sexual 

 diflVrences in the antennas (see figure). 



Thorax : j)ronotum is quite short ; lateral margins slightly 

 divergent the one from the other. Meso + metanotum equally 



* A gular plate of this character is present in many Mallophag-a, 

 e. g., Nirmus varius, Nitzsch, yir7nu.i vu/t/ntus, Kell., Lipeurus (/uadn- 

 pustulatus, Pia;r. The peculiar structures in this part of the head iu 

 Ancistiona and Pseudomenopon tridens are, perhaps, modified gular plates. 



