APPENDIX. 255 



L. ceneiis. 

 Scale not examined. 



Lepidocyrtus purpureus. 



Scale. — Structure similar to L. violaceus ; scale 

 rather thinner and smaller ; markings more difficult to 

 resolve. 



Plate LXXVI. 



Lepisma saccharina. 



Scale. — From twenty to twenty- six strongly marked 

 hnes parallel to pedicle ; marginal lines broken up into 

 an oval-beaded appearance by the intersection of lines 

 radiating from the pedicle ; external surface of under 

 membrane, well defined straight corrugations from 

 pedicle to apex; outer surface of upper membrane, 

 corrugations radiating from pedicle, deeper towards 

 the pedicle than at the apex. 



Plate LXXVII. 



Machilis polypoda. 



Scale. — From eighteen to twenty-four strongly 

 marked compound ribs parallel to pedicle ; well de- 

 fined cross markings between and at right angles 

 to main ribs ; external surface of under membrane, 

 straight longitudinal corrugations; external surface 

 of outer membranes, smooth nearly flat, indications 

 of undulations near to and radiating from, pedicle; 

 cross lines due to structure between the superposed 

 membranes. 



Plate LXXVIII. 



MacJiilis maritima. 



Scale. — Same structure as M. fohjpoda ; scale 

 longer in proportion to width ; the longitudinal ribs 

 not so numerous, varying from twelve to fifteen. 



