366 Description of Lepidopterous Larvoe. 



third, the caterpillars of which escaped after they had been brought 

 nearly to maturity. 



Number one. Limacodes ? Larvse flattened above and at the 



sides, with dorsal and lateral longitudinal keels, ornamented with 

 rows of densely spinulose fleshy tubercles, those on the dorsal 

 keels being much the longer, and of these, two thoracic pairs 

 on the third and fourth segments, and the pair on the eleventh 

 segment are much the longest. Color dark grayish green, with rows 

 of lighter silvery gray spots, small, and nearly round. The same color 

 extends to the tips of the tubercles, and over the whole dorsal and lateral 

 surfaces, giving the larvae the appearance, at a short distance, of a bit of 

 gray bark or lichen. Under surface light dirty green. Thoracic legs 

 white and minute. Head and mouth parts dark brown, and concealed 

 beneath the grayish hood. Length f inch : Avidth, at sixth segment, 

 f inch, exclusive of the spines. September 10, 1875 Planus occklen- 

 talis. S. L. Hewitt, Esq., one specimen. 



Remarks. This interesting larvae was brought me on the date above 

 mentioned, and when taken from the box, in which it had been placed, 

 was still feeding. When placed under the glass, it ate the maple and 

 cherry as w^ell as the sycamore. It is the thinnest species, from the 

 dorsal to the ventral surface, of any that I have bred. It affords 

 the best case of protective mimicry, of any larvae I have seen, except 

 Catocola and some of the Phalenidce, being exactly the color of the 

 grayish green bark of the tree on which it feeds. The cocoon, which was 

 spun between two leaves, was finished, to all outward appearance 

 in half a day. It is small, oval, dense, slightly silky on the outside, 

 and darker colored than those of its allies. 



The striking resemblance of the insect to a bit of grayish bark or 

 lichen, and the ]'ows of lighter spots, will enable any one to recognize 

 it at once. If undescribed, it may be called Limacodes anjentatus. 



Number Two. Limacodes ? Larvae oval, flattened above, 



slightly keeled and flattened at the lateral surfaces. 



Color light pea green, with obscure lighter spots irregularly scattered 

 over the dorsal and lateral areas. Dorsal surface, as seen from above, 

 nearly oval, more pointed behind. Keels without spines or ornamen. 

 tation. Under surface light yellowish green, thoracic legs white. 

 Head and mouth parts light brown, concealed under the hood. Length, 

 •^inch: width, at sixth segment, § inch. Sept. 5, 1875. Cherry, one 

 specimen. 



Eemaeks. I found this interesting larva, at the date above men- 

 tioned, on the common cherry. It was full grown, and escaped on 

 the day but one following, after having commenced its cocoon. It was 



