ENTOMOLOGICAL CONTRIBUTIONS. 119 



The larva has not, that I am aware of, been previously described, 

 nor can I find any positive record of its observation. It seems to 

 have occurred at Otisco, N. Y., for, in reply to some inquiries 

 directed from that place to Mr. 0. V. Riley, the answer is returned 

 that " the Eudryas larva which feeds on Epilobium color atwtn, or 

 Purple-veined Willow-herb, is in all probability E. unio Hiibner, 

 although we cannot determine positively unless specimens are sent."* 

 Harris, Fitch and Riley describe the moth, but were doubtless unac- 

 quainted with its larva; for Harris states his ignorance of it; and, 

 although Dr. Packard asserts that Fitch has raised both grata and 

 unio. from the grape, f there is reason to believe that Dr. Fitch had 

 assigned to unio, without any knowledge of its habits, the food-plant 

 of which it was natural to suppose it would partake in common with 

 its congener ; \ and Mr. Riley also probably includes it among his 

 " blue caterpillars of the vine," without personal observation, but 

 from a reliance on the usual accuracy of the statements of Dr. Fitch. 



At present we have no information of its having been found on 

 any other plant than Epilobium coloratum. It is quite remarkable 

 that two species, so closely allied, should have such dissimilar food- 

 plants. The fact suggests an interesting inquiry, whether unio be 

 confined to Epilobium, or if it occurs on other of the Onagraceae, 

 or even ranges to some other order. As grata is known to feed on 

 Ampelopsis as readily as on the grape, it is not improbable that a 

 careful examination, during the month of September, of the common 

 evening primrose ((Enothera l)iennis\ may be rewarded by a dis- 

 covery of unio upon it. 



Two other larvae occur in New York, viz., Alypia octomaculata 

 and Psychomorpka epimenis (Drury), which bear so strong a resem- 

 blance to the Eudryades, that the four are liable to be confounded, 

 not only by the casual observer, but by the entomologist who may 

 not have acquainted himself with their characteristic features. 



Of A. octomaculata, Harris remarks, || " It resembles the larva of 

 Eudryas grata in its colorings and markings so much, that, before I 



* The American Entomologist , 1870, vol. ii, p. 59. 

 f Proc. Essex Institute, 1864, vol. iv, p. 27. 

 \ Third Report on the 'Insects of New York, p. 81. 

 Second Report on the Insects of Missouri, 1870, p. 83. 



|| Entomological Correspondence of Tliaddeus William Harris, M. D., Boston, 1867, 

 p. 116. 



