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PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLUB 



EDITED BY GEORGE DIMMOCK AND B. PICKiWAN MANN. 



Vol. II.] Cambridge, Mass., May-August, 1878. [Nos. 49-52. 



On Larvae of Tineina, especially of Lithocolletis. 



In Psyche, v. 2, p. 81-87, I have alluded to the discovery 

 by Dr. Clemens of two larval forms of Lithocolletis in this 

 country, and have stated that in some species of what Dr. 

 Clemens calls the second or flat group I had observed a modifi- 

 cation which I called the intermediate form, under the impres- 

 sion that it afforded a connecting link between the second 

 group and that which Dr. Clemens considered the first or 

 cylindrical group ; coupled however with the suggestion that 

 this supposed intermediate form might prove to be only a later 

 stage of growth of the flat form. This suggestion proves to be 

 the truth ; the intermediate form is the last larval state of the 

 flat form, and is also a connecting link between the first and 

 second larval groups. As hereinafter stated, however, the larva 

 at this stage undergoes a change of form without moulting, and 

 fig. o, p. 83, represents it at one point only of this larval stage. 



This is, however, not the only connecting link between the 

 two groups, for L. ornatella of itself forms another group, and 

 at the same time affords another connection between Dr. Clem- 

 ens' first and second groups, as well as connecting both with 

 Dr. Clemens' genus Leucanthiza. But notwithstanding that the 

 larvae of all three groups are thus connected, the groups are 

 distinct and well marked, so that, in a large collection, ninety- 

 nine out of every hundred would, without hesitation, be re- 

 ferred to its appropriate group. But while this is true it is also 

 true that the larvse of all the groups resemble each other closely 

 on their emergence from the egg, and are almost indistinguish- 

 able in the latter part of the last larval state, and the pupaa are 



