478 Prof. E. B. Poulton on the Mimetic N. American 



with more branching spines and with short fleshy tubercles 

 giving rise to small clusters of hairs." 



The southern Limenitis (Adelpha) bredowi a 

 MIMIC OF THE NEOTROPICAL Adelphas. — Mr. Marshall 

 has kindly compared the patterns of the extremely flne 

 series of Adel])has in the British Museum with that of Z. 

 hrcdowi, and he finds that the latter most closely resembles, 

 on both surfaces, A. dyonysa, Hew., while, as regards the 

 upper side alone, rnassilia, Feld., lerna, Hew., and fcssonia, 

 Hew., would come into the same assemblage. The yellowisli 

 tint of the band ofhrcdoioi, so clearly mimicked by lorqidni, 

 is apparently not itself a result of mimetic resemblance to 

 the Adelphas ; for all the Central American species have 

 the baud pure white or bluish-white, with the exception 

 of A. pione, Godm. and Sal v., and one or two species like it 

 — all very dissimilar from hrcdowi. 



The Geographical distribution of the western 

 species of Limenitis in N. America. 



L. calif ornica occurs, as has been already mentioned, in 

 Oregon, California and Nevada, and the southern L. hredovji 

 in Arizona, Mexico and Guatemala; L. lorqnini occurs with 

 ailifurniva in the three first-named States, but extends 

 much further north along the Pacific coast into British 

 Columbia and Vancouver's Island. L. wcidemeyeri, Edw., 

 is described as ranging from the Pacific slope eastward to 

 Montana, Nebraska and New Mexico. The 18 specimens 

 in the British Museum are from Colorado and Utah. 

 Scudder gives the distribution as the Kocky JMountain 

 Region from Montana to Colorado (Bull. Buffalo Soc. N. 

 Sc, Feb. 1875, p. 233) and concludes from the dates of 

 specimens captured on the Yellowstone Expedition in 1873 

 that its periods resemble those of B. arthcmis (Proc. Bost. 

 N. H. Soc, vol. xvii, 1874-5. Ent. notes, IV). 



The early stages of wcidemeyeri, according to Edwards, 

 resemble those of L. archippu^ (Can. Ent., xxiv, p. 107). 

 The larvae of lorquini are described by Dr. G. Harrison 

 Dyar (1. c, xxiii, p. 172). 



Relation between the pattern of L. lorquini and 



THAT OF the NON-MIMETIC L. WEIDEMEYERI. 



In the above title I have not committed myself to the 

 view that the pattern of lorqvAni has been evolved from 



