322 T. D. A. COCKKKELL. 



easily be found, '^llie British botanist, accustomed to two or three 

 species of Aster, two of Erigeron, two of Oxytropis, and three of 

 Astragalus, is astonislied at the enormous species-fertility of these 

 four genera in Rocky Mountains ; while on the other hand a resident 

 of Colorado, who is used to four species of Rubus and three of Hie- 

 racium, may well be startled to find that in the British Is. the Ruhi 

 are reckoned at something over sixty, and the Hieracia, given as 

 forty in the last " London Catalogue," are still being added to at a 

 quite remarkable rate by Mr. Hanbury ! 



Among insects, Argynnis and Colias, and several genera of Noctuse, 

 exhibit strong species-forming tendencies in the Western States of 

 North America. Catocala, in the Eastern States, has a very strong 

 species-forming area. And so on in many other instances which 

 will occur to the reader. This phenomenon is a most remarkable 

 one, since it affects chiefly old and almost cosmopolitan genera, and 

 does not occur in the same districts in all the genera. Two cosmo- 

 politan genera, as we have seen, may have their species-forming areas 

 on opposite sides of the world. It would seem, indeed, as if there 

 were causes at the bottom of it, that we do not yet understand. 



IvISX OK SPECIES. 



COL,EOI»TERA. 



CICINDELID^. 



1. Cicindela longilabris Say. Also high-alpine aud Canada. 



2. " sexguttata var. patruela Dej. East to New Jersey (Smith). 



3. " repanda var. oregona Lee. Goes north to Stikine River aud 



Glenora, B. C. (Wickham). 

 These are boreal forms. The absence of C. pnnctiilata var. micans Fb., 

 which one finds in the sub-alpine zone, is to be noted. Down at 

 Canon City Mr. Wickham found C. fulgida Say, C. vulgaris Say, C. 

 scuteUaris Say, and also one of our mid-alpine species, C repanda Dej., 

 the specimens approaching the var. oregona. At Salida he took C. 

 formosa. These facts, and others quoted below, are derived from a 

 MS. list very kindly sent me by Mr. Wickham, of his captures at the 

 following places : 



Canon City, Colo., 5343 ft, May 11 to 14, 1891 (sub-alpine). 



Salida, Colo., 7049 ft.. May 15 to 16 (low raid-alpine). 



Red Cliff. Colo., 8671 ft.. May 16 (typical mid-alpine). 

 Canon City is only about twenty miles from Wet Mountain Valley. In 

 several instances I have added to the records below the names of 

 other species of the .same genera found in the sub-alpine, etc. I place 

 these in square brackets [ ] that there may be no confusion. 



