AMERICAN IIOMOPTERA. 365 



The insects lie motionless beneath the scales, with their backs hump- 

 ed up, and the belly a little concave, presenting some resemblance to 

 a menicus glass. The sharp-pointed proboscis may be seen, in some 

 cases, projecting a little downward and into the bark, if we are suffi- 

 ciently fortunate to separate the scale properly. 



The insect is now perfectly free from its outer garment, and in cast- 

 ing it off" it has pulled off" its legs, antennae, &c. ; henceforth it lives 

 beneath it as under a roof, and having no more use for legs it has am- 

 putated them. 



Evening. — Very few are free and moving. Strangely to me, after 

 reading from reputable Authors that they fix themselves in about ten 

 days, I behold so great a change, in one beautiful, warm, summer day. 

 None of those on the apple limb in the cellar have located themselves, 

 and I am not able, at least, to detect any in the scale form. 



June. 10th. — I examined the apple-trees this morning, and found a 

 very few larval Bark-lice crawling about on the limbs. Afternoon and 

 evening very showery. 



June 11th. — I find a very few larval Bark-lice running on the apple 

 limbs. I reexamined the feet of these insects and find the same ap- 

 pearance as above noted. 



Jult/ 1st. — The young Bark-lice have grown considerably. The 

 scale has received an enlargement by a second addition to the posterior 

 extremity of the first, or original scale over the head, which is in its 

 primative location and of a yellow color. The insect, by growing, ex- 

 tends backward from the primative point of attachment. The color 

 of this second addition to the scale is hoary cinereous or incanus. The 

 first, or old scale, can readily be separated from the second ; the attach- 

 ment has not yet grown firm. 



This scale, which so much resembles a waxy exudation, is really the 

 cast-oft' skin of the insect, cemented, by some kind of an exudation, to 

 the bark, and the several pieces of separate moultings are cemented 

 into one roof-like habitation. What this exudation may be, is a mat- 

 ter open to reflection and examination. Is it an exudation from the 

 whole surface of the body, from the anus, or from secreting tubes in 

 the abdomen, as the honey-tubes in some of the Aphidiaus ? That it is 

 not a surface secretion, we know, from the fact that the integument is 

 always free from the scale, and the body is as strictly articulate as that 

 of any other insect. The absence of honey-tubes prove that it is not 

 secreted by such organs. I have not seen this secretion being deposit- 

 ed, and presume that it will be difficult to detect; but as it is deposited 



