REVISION OF ELEODTINI BLAISDELL. 



309 



mountains and foothills from the southern to the northern parts of 

 California. 



IIopiniKjii is at present only known from P^klorado County; clavi- 

 comis and scahrosa maritime and lovers of sand-dunes. 



Cordata occurs from Los Angeles to northern parts of the State 

 and at all extreme points of its northern distribution passes into 

 pimelioides, which has the largest distribution of any species of Bla- 

 pylis, occurring in Colorado, Montana, Wyoming, Idaho, Utah, Ne- 

 vada, Oregon, AVashington, Vancouver Island, British Columbia, its 

 var. hrunnipes in Idaho, Wyoming, Colorado, and Nevada. 



Most of the species are developing into a considerable number of 

 incipient races. 



Consoh-ina Blanchardii Puchsii 



Neotomae 



Flauata 



ParvkoTlis 



Producta 

 Densa 



C^Pimdioides 

 nipes 



Subgeneric Truiik 



Fig. 6. — Genealogical diagram of the subgenus blapylis. 



Genealogy. — It is doubtful if by any herculean effort a biologist 

 could in the period of a few years, with the comparatively small 

 series of specimens at hand from the different regions which they 

 inhabit, work out a correct history of descent. 



The individuals of the species making up the present subgenus are 

 very protean in their divergences. 



They have evidently diverged along three main lines from the an- 

 cestral subgeneric trunk (see diagram). It is quite hypothetical 

 whether tihialis belongs to Blapylis at all ; if not, it must have con- 

 geners in Mexico. If it does belong here it diverged early. 



Taking the degree of constriction of the prothoracic base as the 

 criterion of divergence, two lines of descent are evident — cordata and 

 pimelioides with a cordate type of prothorax and the lateral margin 



