648 



MR. B. F. CUMMINGS ON LICE 



Philopterus cursor (text-fig. 1 ). — Based plate : Compared with 

 parameres this is very long indeed, fairly broad, the lateral 

 margins divergent from in front posteriorly. Parameres : Short, 

 inwardly curved, flattened, with acute tips. Endomeral plate: 

 Tiiis runs out between the parameres into a broad rounded apex. 

 There is a median longitudinal groove and a transverse groove 

 catting the former at halfway, dividing the plate into four sections 

 of the shape seen in the figure. Under a high power there are 

 visible on these areas eight white spots, probably representing the 

 aiveoli of minute sensory hairs. There are three of these in each 

 posterior area and one in each anterior area. The forked I'od 

 is thinly chitinized, but recognizable. The two small nodular 

 swellings at "a" are ridged and densely chitinised, and may be 

 homologous with the parts similarly lettered in P. cehlehrachys 

 and in P. asturinus with the penis. 



Philopterus cehlehrachys (text-fig. 2). — Basal plate : About 

 four times as long as the parameres. The posterior half is 

 broader than the anterior half, and possesses strongly chitinised, 

 parallel, lateral margins. Parameres : Quite short, stout, slightly 

 incurved, Endomeral plate : Broad behind, nearly as long as 

 parameres. Posterior lateral angles rounded. A nai^row band 

 runs along posterior margin. Lateral margins straight, con- 

 vergent anteriorly. Anterior margin short, straight, each 

 anterior lateral angle produced into an outwardly curved 

 process. Forked rod well developed, the handle of the fork 

 incompletely fused, indicating its originally double nature. The 

 transverse piece is liomologous with the part similarly shaped in 

 P. athene. 



Philopterus athene. — This resembles the apparatus of P. cehle- 

 hrachys. In length of the head this species recalls P. rostratus ; 

 in the form of the vesicula seminalis it approximates to P. cursor, 

 but the vesicula of P. rostratus I have not yet been able to 

 examine. Basal plate and Parameres : As in P. cehlehrachys. 

 Endomeral plate : As in P. cehlehrachys, except for the concave 

 posterior margin. " Forked rod " : Represented by two rods 

 converging postei'iorly. The transverse piece : This is obviously 

 homologous with the part so named in P. cehlehrachys, but each 

 half is concave and not straight. 



The Mouth -parts of Philopterus ceblebrachys. — Lyriforun 

 organ : Anterior cornua short and broad ; posterior cornua 

 absent. Labkmi : A labial sclerite is present, as in Trichodectes 

 gastrodes Cummings (7, p. 99) and in Goniodes falcicornis Nitzsch 

 (Paxt I. p. 287) ; its posterior cornu on each side curves outwards 

 and stops at the base of the " paraglossa"; the transvei-se bar is 

 short and situated far forward, near the front margin of the 

 labium ; anterior cornua absent. 



