376 



MB. H. WALLIS KEW ON THE 



more than one third of the sntural margin. Wings very dark 

 fuscous. Abdomen, cerci, and legs dark blue with metallic 

 reflections, supra-anal lamina trigonal, sub-genital lamina cleft 

 and valvular in appearance ; cerci very long, with sparse erect 

 pubescence, not acviminate. Formula of apical spines -, -, ^, no 

 genicular spine on front femora ; front tibiae with three apical 

 spines and one spine beneath, mid and hind tibiae with two 

 widely separated spines above, four apical spines and a double 

 row of spines beneath. 



Total length 14 mm.; length of body 11 mm.; length of 

 tegmina 11 '5 mm. ; pi-onotum 2'8 mm. x 3 mm. 



Ecuador. 



One example (Saunders collection, Oxford Museum). 



This gorgeous little cockroach is also very like a Telephorid, 

 but I have not been able to match it with any particular species. 



In the preparation of this paper I have been much indebted to 

 the kind assistance of my friend, Mr. G. J. Arrow, who has 

 diligently searched the rich collections of Ooleoptera in the 

 British Museum for models to some of the remarkable mimetic 

 cockroaches described above. Mr. Arrow has also supervised the 

 preparation of the plate accompanying this paper. 



EXPLANATION OF PLATE XLVIIL 



Eig. 1. Mega'pyga eximia Boh. 



2. Froso-plecta hipunctata Br. 



3. Oides hiplagiata Jac. 



4. Frosoplecta trifaria Walk., $ . 



5. P. coccinella Sauss. 



6. P. nigra, sp. ii. 



7. P. gutticollis Walk. 



8. Prioptera sinuata Oliv. 



9. Prosoplecta nigroplagiata, ST^.n. 



10. Oides hiplagiata Jac, var. 



11. Prosoplecta trifaria Walk., $ . 



Fig. 12. Leis dunlopi Crotch. 



13. Prosoplecta semperi, sp. ii. 



14. P. quadriplagiata Walk. 



15. P. mimas, sp. n. 



16. P. rnfa Kivbj^ 



17. Melyroidea mimetica, sp. n. 



18. 3£. niagnifica, sp. n. 



19. Prosoplecta coelop>7ioroides, 



sp. n. 



20. Anisolemnia distaura Muls. 



21. Coelophora formosa Crotch. 



20. On the Pairing of Pseiidoscorpiones. 

 By H. Wallis Kew, F.Z.S. 



[Received January 20, 1912 : Read February 6, 1912.] 



(Text-figures 47-50.) 



I. Introduction. 



The breeding habits of Arachnida are of special interest from 

 the fact that in no other Class do we find so great a diversity of 

 method *. Much attention has been paid to the subject, and 

 the main facts are established for most of the Orders. For Pseudo- 

 scorpiones, however, scarcely anything is known. 



Rosel von Rosenhof, so long ago as 1755 (1), tells us that he 

 kept these animals together for a long time in the hope of seeing 



* Cf. Pocock (19), p. 2. 



