694 APPENDIX. 
“ Upper wings of Grylli, §c.— The term elytrum is not improperly applied to 
these case-wings ; it means merely an integument, and I don’t see that any con- 
fusion is generated by the use of it. Even amongst the Coleoptera, the elytra 
of some are scarecly more than coriaceous, while in others they are a very hard 
crust. The term elyfrum of itself does not properly convey the idea either of a 
corneous, coriaceous, or membrancous wing-cover, but merely of a wing-coyver. 
The same observation holds good with respect to the Coleoptra, which is so 
convenient that it will not be easy to do without it, and it is used without im- 
propriety, strictly considered, for when thus used it is merely saying wing-cases 
so and so. The term Hemelytrum is more applied to Cimices, I believe; elytrum 
would be proper for Cicada, but not for Chermes, Aphis, and Thrips. All that 
seems necessary is under each order or section to define the substance of the 
elytra. You seem not to have noticed the difference between the terms Coleo- 
ptera and Coleoptra. You will find, when it is applied to the elytra of indivi- 
duals, it is always spelled in the latter way. 
« Squamula. — Linné, indeed, in his generie character of Formica, uses the 
term sguamula, but never once in his description of the species; here it is always 
squama. Fabricius and Latreille invariably haye it squama. Linné’s generic 
character will not be adopted, because it does not include all the species ; or if 
it should be adopted, squamula would properly be changed to squama, I 
therefore see no reason for giving up my own term, which I think every im- 
partial person will prefer to Illiger’s. A little scale is certainly much better than 
a little tile, for the part in question; indeed, the latter strikes me as bordering 
upon the ridiculous. 
“Tam sorry to find, that in my haste in putting up the insects, for Mr. Rod- 
well to take, I forgot the Scymnus I reserved for you, and also a little Aleo- 
ehara (rufangula) which I have of yours, taken when you were here, under some 
moss in Shrubland Park. 
“ Noy. 29. —I have carefully read over your excellent sketch for a plan of 
our work, and upon the whole yery much approve of it. What we say in the 
first letter with respect to objections farther than glancing at them, should be to 
meet and refute the charge of cruelty, which is also one great objection with 
the fair sex from pursuing the study. ‘The cuz bono objections will be answered 
partly when we detail the general advantages, and more fully as you propose, 
and have done excellently, in the 12th letter. I am not altogether of your 
opinion with respect to the mode of treating the Nore Insectorum, for I think 
the general effect will be much the most striking and alluring, if we conelnde 
with the ravages of the locusts. We are giving a general view of the subject. 
Our Introduction is a general Introduction to Entomology, and if we give a par- 
ticular detail of the injuries our country receives, as we should of course do, 
this will be sufficient to interest the reader, and will remain longest upon his 
mind, because always under his eyes, though we leave off with exotic depreda- 
tions. Don’t let us expose ourselves to the sneers of hypererities, that we are 
proficients in the Bathos, or art of sinking. ‘This is all material that I find to 
object to in your plan; the rest is admirable, I think the directions for taking 
insects, preserving, &c., should follow the technical part, for, as my friend Mac 
Leay observed, we should first, tell our correspondent what an insect is, before 
we set him to catch it. From your plan, which urges strongly the placing 
Noxe before the Beneficia, you seem to have imagined I had placed the latter 
first, but in this your memory failed you; it is always best to leave off with the 
fair side. . 4 . Pray tell me in your next what parts of the work, besides the 
History of Entomology, you would like best to do, as I shall soon set hard to 
work, an ’tis pity we should both gnaw the same bone, When you have 
gnawed your bones, send them to me, and I will do the same by mine; so hey 
will stand a good chance of being picked quite clean. I shall hope for muc 
