7308 Notices of Nero Books. 



tomentose sqnamosity either more or less piliform and opake or very 

 fine silky and bright: this ground-layer, common to many other 

 tomentose Coleoptera, is comparatively persistent, though far more 

 easily rubbed off than setiforra or hairy pilosity, and is analogous to 

 the squamosity of species having one layer only : this tomentosity 

 is not produced by exudation, but grows according to the general law, 

 is susceptible of partial or total baldness, as in merely squamosa 

 insects, and if rubbed off when the insect is alive vfould be restored 

 in course of time only. Then comes the second layer, much less per- 

 sistent (even in non-pollinose species), which in the above two 

 genera, as in many others, is a real poUinose transudation, susceptible 

 of a relatively immediate renewal when rubbed off the living insect. 

 Of this upper layer I need not remark, after the conscientious ob- 

 servations of M. Godart, the highly interesting controversies of MM. 

 Coquerel and Laboulbene, and the experience of M. Rojas, all 

 recorded in the 'Annales de la Societe Entomologique de France,' 

 1851—1857. 



" Hence the results in pollinose species are these : specimens may 

 have their pollinosity more or less rubbed off, and show underneath 

 part of the ground squamose tomentosity ; others may be completely 

 deprived of that pollinose efflorescence, and show the ground tomen- 

 tosity only ; finally, others, still more rubbed, show only a portion of 

 the latter, &c. Any entomologist, therefore, in describing either squa- 

 mose, tomentose or pollinose species, should not content himself with 

 the description of so variable a substance only, but note also if there 

 is another layer beneath it, and, in fine, should lay bare the derm, in 

 order to display its characters. 



" Exclusive of hair or pile, to which (like naked Coleoptera) 

 squamose, tomentose or pollinose species are liable, one might 

 divide them, according to the composition of their clothing, as 

 follows : — 



" 1. Col. Monolepida : having a single layer of squamosity or 

 tomentosity, with or without denser markings. 



" 2. Col. DrLEPiDA : having two layers of squamosity or tomentosity, 

 one inferior with or without denser markings, generally of a pale 

 unicolor hue (gray, ashy or whitish) ; the other superior, less persistent, 

 easier rubbed off, increasing or modifying the coloration of the 

 markings, when they exist, and filling more or less the areas between 

 the markings. 



" 3. Col. Paipalepida : ground-layer tomentose, following the 

 same laws as in class 2 ; but superior layer being a pollinose transuda- 



