EEV. O, P. CAMBBIDGE ON CEYLON SPIDERS, 395 



nute delineation of tlie falces of a number of species by Count 

 Kejserliug (Beitrage zur Kenntniss der Orbitelae, Latr. : Wien, 

 1865), a careful and accurate monograph of the now ratber ex- 

 tensive group of the genus Tetragnatlia (to which the present 

 species belongs) is required to present fairly and distinctly the 

 specific differentiae of its closely allied and similarly formed spe- 

 cies. I possess specimens from Australia, IS'ew Zealand, India, 

 Ceylon, Egypt, Syria, and Europe, but cannot identify the same 

 species as belonging to any two of these portions of the world. 



[To bo coniinucd.] 



Eheatum. 

 Page 267, last lino,/or " spinners 6," read " spinners 4." 



EXPLANATION OF THE PLATES. 



PiATE xr. 



Mygale radialis. 



Fig. 1. Underside of fore part, showing falces, labium, maxillte, and sternum. 



2. Uppcrside of ceplialothorax and abdomen. 



3. Spider, of natural size. 



4. Profile, with legs &c. removed. 



5. Left palpus. 



6. Digital joint and palpal organs connected with left palpus. 



7. Bight leg of first pair, from inner side. 



8. Two groups of spines at extremity of radial joint of palpus, from two 



points of view. 



CJieiracanihium incertum. 



9. Epigyne. 



Tegenaria torva, 



10. Spider in profile, enlarged. 



11. Caput and falces, from front. 



12. Digital joint of right palpus, showing peculiar patch of short closely 



set hairs. 



14. Maxilla3 and labium. 



15. Portion of right palpus, showing palpal organs. 



16. Portion of right palpus. Side view. 



17. Cephalothorax and falces. Side view. 



18. Cephalothorax and abdomen, upperside. 



19. Natural length of spider. 



20. Natural lengths of legs. 



lilNN. PEOO. — ZOOLOGY, YOL. X. 27 



