THE COLEOPTERA OF COLORADO. 221 



Summitville, down to Del Norte, through the San Luis Valley 

 to Saguache and from there to Gunnison. Accurate records 

 were kept and through the kindness of Mr. Hay ward and Mr. 

 Bowditch I am able to include them in this paper. The work 

 done at the Colorado Agricultural College by Prof. C. P. 

 Gillette and his assistants is very important, since they have 

 brought together a great number of species from Fort Collins 

 as well as many from other parts of the state. Having seen 

 practically all of these collections, which were kindly sent me 

 for study by Prof. Gillette, the data are now made available 

 for reference. Mr. E. J. Oslar has sent me collections from 

 the neighborhood of Denver, as well as some from other local- 

 ities which have been useful. My own work as a collector in 

 Colorado may be stated briefly as follows, — a stop at Greeley 

 during the early part of May, 1889; a visit to Canon City, 

 Salida, Red Cliff and Grand Junction in May, 1891 ; about two 

 months at Colorado Springs, Buena Vista, Leadville and 

 Breckenridge in 1896, followed the next summer by a trip of 

 several weeks duration to Denver, Georgetown, the Leaven- 

 worth Valley, Silver Plume and Ouray. 



From the foregoing remarks it will be seen that nearly all 

 of the collecting has been done in a strip extending north and 

 south, embracing the territory covered by the principal moun- 

 tain chains and their foot-hills, while the great slope of plains 

 lying east of the longitude of Pueblo is practically untouched. 

 Nothing is known of the extreme northwestern corner and in 

 fact most of the region west of the 108th meridian is still 

 waiting to be worked. Further study should be made of the 

 very high peaks, in search of remnants of the Arctic fauna. 



The phenomena of distribution in Colorado are of much 

 interest. Within a radius of a few miles we ma} r find assem- 

 blages of species representing at least three distinct faunae. 

 The first, that of the great plains surrounding the mountains, 

 is marked by a great development of wingless or imperfectly 

 winged forms, probably largely invaders from the south where 

 we may suppose that the arid deserts first made their appear- 

 ance and where this characteristic feature is more in evidence 



