ENTOMOLOGICAL CONTRIBUTIONS. 121 



writes (loc. cit., p. 306), "larva entirely naked;" and, on page 307, 

 he institutes a comparison between the caterpillars of the Agaristiadae, 

 " which are sparingly covered with hairs," and those of Eudryas, " in 

 which the caterpillar is not at all hairy." The two figures of grata 

 given in the Treatise on Insects Injurious to Vegetation , represent 

 the larva as hairless. Riley (%d Rep. Ins. Mo., p. 80) says of octo- 

 maculata, " each spot or tubercle gives rise to a white hair," and of 

 grata (1. c., p. 83), that it differs from the preceding by the hairs 

 being less conspicuous. Of the latter species Mr. W. Saunders* 

 states that " the bands are dotted with round black dots, from each of 

 which arises a single short brown hair." 



In the examples of the larvae (about half-grown) of grata before 

 me, the hairs do not exceed in length the breadth of the central band, 

 and are noticeable only on close observation. In octomaculata they 

 are quite long, equaling in length the diameter of the body, if we 

 may refer to this species the description by Dr. Packard f of some 

 larvae collected by Mr. Putnam on the grape-vine, and deposited as 

 grata larvae in the Museum of Comparative Zoology at Cambridge. 

 The description of the grata larva, given in the Guide to the Study 

 of Insects, pp. 281-2, with its hump on the eighth ring, and each 

 segment having across it a row of tubercles which give rise to three 

 fascicles of hairs, evidently refers to some other form. 



The following may be noticed as distinguishing features of these 

 closely allied forms, which should serve to remove all occasion for 

 confounding the two first mentioned with one another or with the 

 Eudryades : 



The larva of Psychomorpha epimenis (also a grape-vine feeder) has 

 on each segment four white and FlG - 1 - 



four black bands (four-banded on a 

 white ground), arid is without the 

 orange band which exists in the 

 other three. The spots which COD- 

 FIG. 2. spicuously mark the others are obsolete in this. 

 In Fig. 1 the larva is represented at a/ & is an en- 

 larged representation of one of the segments, and in 

 c is given the marking of the hump on the eleventh 

 segment. The male imago is shown in Fig. 2. 



* First Ann. Rep. on the Noxious Insects of the Province of Ontario, 1871, p. 35. 

 f Notes on tlie Family Zyganidw, in Proc. Ess. Ins., vol. iv., p. 28. 



