the British Machilidse. 15 



Fig. 3. Right mandible of female, hinder aspect. a, apex ; m, molar 

 area ; c, condyle. X 62. 



Fig. 4. Terminal region of the same mandible, showing blunt teeth at 

 apex (a). X 280. 



Fig. 5. Left maxillula, inner view, showing teeth on inner side of 

 lacinia (L). g, galea. X 124. 



Fig. 6. Rigbt maxilla of female, hinder aspect, c, cardo ; st, stipes; 

 I, lacinia ; g, galea ; p, palp. X 62. 



Fig. 6 a. Head of lacinia showing apex (a), " brush " (£), and acute pro- 

 cesses (c and d). X 280. 



Fig. 7. Labium of female, showing submentum (m) and mentuni (I). 

 p, palp, x 62. 



Fig. 7 a. Sensory spines from apex of labium, x 280. 



Plate IV. 



Structural details of Petromachilis hngicornis (continued). 



Fig. 1. First abdominal segment, 2 > ventral aspect, s, sternum ; sc, 

 subcoxa; ve, exsertile vesicle. X 62. 



Fig. 2. Second abdominal segment, $, ventral aspect, showing two 

 pairs of exsertile vesicles (ve). s, sternum; sc, subcoxa; 

 st, stylet. X 62. 



Fig. 3. Third abdominal segment, $, ventral aspect, s, sternum; 

 sc, subcoxa ; st, stylet ; ve, exsertile vesicles. X 62. 



Fig. 4. Fourth abdominal segment, $ , ventral aspect, s, sternum ; 

 sc, subcoxa ; st, stylet ; ve, exsertile vesicles. X 62. 



Fig. 5. Fifth abdominal segment, $ , ventral aspect, s, sternum ; 

 sc, subcoxa ; st, stylet ; ve, exsertile vesicles. X 62. 



Fig. 6. Sixth abdominal segment, § , ventral aspect, s, sternum ; 

 sc, subcoxa; st, stylet; one pair of exsertile vesicles (ve). 

 X 62. 



Fig. 7. Seventh abdominal segment, $ , ventral aspect, showing sub- 

 coxae (sc) produced into prominent rounded lobes, s, ster- 

 num ; st, stylet ; one pair of exsertile vesicles (ve). X 62. 



Fig, 7 A. Seventh abdominal segment, <$ , ventral aspect, s, sternum ; 

 sc, subcoxa; st, stylet; one pair of exsertile vesicles (ve). 

 X 62. 



Plate V. 



Structural details of Petromachilis longicomis (continued). 



Fig. 8. Eighth abdominal segment, $ , ventral aspect, sc, subcoxa ; 



st, stylet ; o, process of ovipositor. X 62. 

 Fig. 8 A. Eighth abdominal segment, J (immature), ventral aspect. 



s, sternum ; sc, subcoxa ; st, stylet ; g, gonapophvsis. 



X 124. 

 Fig. 9. Ninth abdominal segment, $, ventral aspect, sc, subcoxa; 



st, stylet ; o, process of ovipositor. X 62. 

 Fig. 9 a. Ninth abdominal segment, J, ventral aspect, sc, subcoxa; 



st, stylet ; g, gonapophysis ; p, penis. X 62. 



