160 



h. Synopsis of Neuroptera [announcement of a new edition of Dr. Hag- 

 en's Synopsis of the Pseudo-Neuroptera and Neuroptera of North Amer- 

 ica, and request for contribution of materials], p. 76. i. On the Use 

 of Cyanide of Potassium [directions for catching and killing moths, "etc.'*] 

 (by Joseph E. Chase), p. 97-98. j. Entomological Club of the American 

 Association for the Advancement of Science [announcement of meeting to 

 be held at Detroit, Aug. 10, 1875], p. 118-119. k. Important to Entomol- 

 ogists [further announcement of next meeting of Entom. Club. A. A. A. S., 

 and call for a large attendance], p. 121-122. I. Pieris rapce [spread- 

 ing westward in Ontario] (by W. Saunders), p. 163. m. Ptetophorus pe- 

 riscelidactylus [capture of this species (at ? Kingston, Ont.), Oct. 31, while 

 the thermometer was several degrees below freezing] (by R. V. Rogers), 

 p. 218. 7i. Petitions for exchanges [offering insects of Nebraska and 

 Kansas, and Coleoptera of New York*, the Gulf States, Europe, Australia 

 and New Zealand] (by J. M. Grant, George P. Cooper, F. G. Schaupp 

 [mispr.], W. V. Andrews), p. 219. o. Canadian Entomologist [full sets can 

 now be supplied], p. 220. Index, p. 249-252. 



Proceedings of the Cfub. 



§ 9. Mimicry. Mr. Scudder spoke of the mimicry 

 between Basilarchia Disippe and the co-territorial species of 

 Danaus ; where Plexippus is the more abundant species of 

 Danaus, the mimicking B. Disippe wholly resembles it in color; 

 but where D. Berenice prevails (as in the extreme south) the 

 color of the mimicking species darkens so as to resemble it. 

 He did not think that we had yet reached a satisfactory solution 

 of the facts of mimicry. If the object of mimicry is the protec- 

 tion of the insect, why does it not occur more frequently in 

 those stages of the insect's life when the animal is peculiarly 

 liable to attack from such foes as mimicry is presumed to 

 blind ? Nine-tenths at least of every brood of any given insect 

 are destroyed during the larval period, and so far as he was 

 aware, there was but a single instance known, in which one 

 caterpillar mimicked another less liable than itself to the attacks 

 of foes. He referred to the mimicry, said by Boisduval to be 

 shown by the African Diadema Bolina to Danaus Chrysippus. 



{March 13, 18740 



Mr. E. Burgess called attention to the imitation of twigs 

 which obtains in many larvae of Phalaenidae, as examples of 

 protective mimicry in the early stages of Lepidoptera. 



' (April 10, 18740 



No. 23 was issued April 13, 1876. 



