RILEY ANISOPTERYX VS. PALEACRITA. 575 



nata, and by calling the other species vernata Harris instead of 

 vernata Peck. The inconvenience of this course, for which there 

 is neither excuse nor justification, is seen in many parts of the 

 work and particularly in the Introduction, where (p. 8) the nanies 

 pometaria (not autumnata) and vernata are used in such manner 

 that, after what is subsequently said on p. 402, the reader can 

 only guess at the species intended. 



But there is far graver error in what is published in the Mono- 

 graph about these Canker-worms, and I call attention to it 

 because it forms a marked exception to the high character and 

 general excellence of the work. The structural characters which, 

 as I have shown, separate Anisopieryx and Paleacrita are partly 

 brought together in a generic diagnosis of Anisopieryx, which dif- 

 fers essentially from all other diagnoses of it, and which ends with 

 the following remarks : 



While Mr. Mann has shown, with much ability, from a consideration 

 of the imaginal characters, that we have two well-marked and perfectly 

 distinct species. Professor Riley has carried the matter further, and judges, 

 from a comparison of the egg, larval and pupal states, as well as the ima- 

 ginal, that not only are the two species distinct, but that there are really 

 two genera, and for vernata he proposes the name Paleacrita. While his 

 work shows great care and thoroughness, I am unable to agree with Mr. 

 Riley's opinion that the differences he points out are of generic import- 

 ance. The imaginal characters are certainly not so ; for in other genera 

 we have as great differences between the different species. The European 

 ivscularia would have to form the type of a third genus, if Mr. Riley's 

 views are correct. We have seen that, as regards the larval characters, 

 vernata in one case has an extra pair of legs, and the two species are some- 

 times easily confounded in the larval state. The eggs of the two species 

 are very distinct; but the form and structure of the eggs in the Phalcenids 

 have not been examined enough yet for us to form a decided opinion as to 

 what are generic and specific characters among them. 



The facts that have just been stated of cescularia show clearly 

 enough that that species will not have to form a new genus ; and 

 as to the single case of the larva of vernata Peck having an extra 

 pair of legs, on which case Dr. Packard leans for several general- 

 izations, a critical examination of the specimen enables me to pro- 

 nounce it not vernata as unhesitatingly as he pronounced it to be 

 that species. It differs from vernata in the indistinctly spotted 

 head, and especially in the dark top ; in having but six superior 

 pale lines ; in having the medio-dorsum dark and without black 



