1874.] 209 [Packard. 



stated in the text, though it is mentioned in the explanation of the 

 plate, and no measurement of the female is given. 



Riley's Second Missouri Report (1870), 8vo., pp. 94-103, contains 

 an article on the Canker-worm, from which it appears that A. ver- 

 nata is the more common species in the West. Mr. Riley states that 

 some of the moths come out of the ground in November. Is this a 

 quotation or an observation? If it is an observation, what is the 

 species? The original matter in this article will become valuable 

 when the descriptions are assigned to their proper species. The 

 figures of the preliminary stages are copies of those in Harris' Trea- 

 tise (1862), pp. 461-465, and therefore belong to A. pometaria. 

 The figures of the male and female are copies of those in Packard's 

 Guide (1869), tab. 8, f. 9, 9a, and, therefore, belong to A. vernata. 

 The figure of the female is enlarged and no measurement is given. 



LeBaron's Second Illinois Report (1872), 8vo., pp. 99-116, seems 

 to treat only of the true A. vernata, but reproduces the figures given 

 by Riley. The measurement of the female is given. Mr. LeBaron 

 implies that some images appear in the fall. The difference of spe- 

 cies sufficiently explains the difference of habits, in regard to which 

 Mr. LeBaron criticizes the statements of Harris. 



Dr. A. S. Packard, Jr. exhibited drawings of the supra- 

 cesophageal ganglion (brain) of the blind crayfish, Camba- 

 rus pelhccidus, from Mammoth Cave, made from specimens 

 kindly loaned by Professor J. Wyman, and also of the ordi- 

 nary Cambarus (sp. nndet.) of DesMoines River, Iowa, and 

 showed the differences between them consisted mainly in an 

 enlargement of the sides of the ganglion in the blind species; 

 supposed to be connected with the sense of hearing. He 

 also exhibited drawings of the inner structure of the eye of 

 the blind species, showing that the pigment cells are white, 

 and the whole eye in a state of arrested development. 



PROCEEDINGS B. S. N. H. — VOL. XVI. 14 APKIL, 1874. 



