TWO NEW LICE. 



255 



only four, with one on each side, and on no. 8 only 2, one on 

 each side of the basal plate. 



Chcetotaxy. Female. — Abdomen : On tergum of segment 1 are 

 two hairs ; in segment 2 there are two hairs on tergite 1 and four 

 on tergite 2. Of the latter the two middle ones are the largest. 

 On the single tergite of segment 3 is an irregular row of eight 

 spines. In segment 4 each of the tergites has a row of eight 

 powerful spines, Avith another hair on each side between the 

 pleurites and tergites. On segment 5 tergite 1 has seven spines, 

 tergite 2 has eight, with one on each side. On both tergites of 

 segment 6 there are seven spines, with one on each side. On 

 segment 7 tergite 1 has eight and tergite 2 has six spines, with 

 one on each side. On the tergite of segment 8 there are six 

 spines. Ventrally segment 2 has six hairs. On segment 3 

 sternite 1 has five and sternite 2 has six, with one on each side. 



Text-figure 6. I 



Polyplax oxyrrhynchus. Male copulatory apparatus. X 500. 



[ PP. Basal plate. Par. Paramevon. P. Penis. 31a. Mesosome (anterior piece). 

 The piece labelled IIP. in text-figure 3 is apparently unrepresented or very small. 



On segments 4, 5, 6, and 7 there are five hairs on sternite 1 and six 

 on sternite 2, with one on each side. On the genital plate is a 

 row of four minute hairs in large alveoli. On. each side of the 

 terminal segment is a group of hairs and one large spine. 



Mole Copulatory Apparatus. (Text-fig. 6.) — This is of the 



18* 



