LOEQUINI MIMICS CALIFORNICA 195 



the most remote ' ; ^ although of course the latter 

 are easy to interpret, while the former may be 

 excessively difficult. In this case, however, there 

 is neither doubt nor difficulty, for not only is 

 there the geographical coincidence between the 

 model and the average increase of the marking 

 in the mimic, but the fulvous apical marking of 

 lorquini — of a somewhat richer, deeper shade than 

 the tawny patch of californica — is due to the in- 

 ward growth of a marginal marking, while that 

 of the model occupies a clearly defined sub- 

 marginal and sub-apical position. The resem- 

 blance is, in fact, produced by markings which 

 are essentially different ; yet in some of the 

 southern examples of lorquini in which the mark- 

 ings extend inward to the greatest distance the 

 superficial resemblance is very considerable. 



The above-stated conclusion that the chief 

 mimetic element of lorquini is on the average 

 subject to considerable strengthening in the 

 southern part of its range, is founded on an 

 examination of the few dozen specimens I have 

 been able to study in English collections, and 

 especially the Godman-Salvin material in the 

 British Museum. I now trust that the subject 

 may be taken up by American naturalists and 

 many hundreds of specimens compared from 

 all parts of the north and south range of the 

 species. 



2. In the second point also, the yellowish tint 



» Trans. Ent. Soc. Lond. (1908), 482. 

 o2 



