DESCRIPTION OF PLATE A. 



Fig. 1. Obisium muscorum Leach. Outlines of under side, enlarged, to 

 shew different portions of structure. 



A. Palpus a, claws of pincers ; 6, bulb of do. ; c, cubital joint ; 

 d, humeral joint ; e, axillary joint ; /, maxilla ; h, falx. 



B. Leg of 3rd pair a, coxa ; b. exinguinal joint ; c, trochantin ; 

 c, femur ; d, tibia ; e, metatarsus ; f, tarsus. 



H. Under side of abdomen shewing transverse segments. 



G. Anal aperture with terminal button. 



D. E. Spiracular orifices. C. Orifice of spinning apparatus. 



C. Site of spinning apparatus. 

 F. Genital apertures. 



Fig. 2. One of falces enlarged with fangs open a, basal joint ; 6, arti- 

 culated fang ; c, serrula. 



Fig. 3. Leg of 1st pair more enlarged a, coxa ; b, trochanter on 

 exinguinal joint ; c, femur ; d, general joint ; e, tibia ; 

 f t metatarsus ; g, tarsus. 

 Fig. 4. Leg of 1st pair of Cherries cimicoides a, trochantin ; 6, termina; 



claws. 



Fig. 5. Leg of 4th pair of do. b, trochantin. 

 Fig. 6. Palpus of Chelifer meridianus a, b, c, d, stems of the several 



joints, 



Fig. 7. Chthonius orthodactylus Leach. 

 ,, 8. Profile outline of cephalothorax and falces of do. 

 ,, 9. Part of palpus of do. 

 Fig. 10. Chthonius Rayi L. Koch. 

 ,, 11. Profile outline of do. without legs or palpi. 

 12. Portion of under side of abdomen of do. a, a, a, a, spiracular 



openings. 



,, 13. Profile outline of portion of cephalothorax and falces do. 

 14. Pincers of palpus do. 

 Fig. 15. Chthonius tetrachelatus Preyss. 



16. Portion of palpus of do. a, indented bulb. 

 Fig. 17. Chthonuis tennis L. Koch. 

 ,, 18. Profile outline of cephalothorax and falces of do. 

 ,, 19. Pincers of palpus do. 



