CONTRIBUTIONS TO THE NATURAL HISTORY 

 OF THE ROCKY MOUNTAINS. I 



By T. D. a. Cockerell 

 ARACHNIDA 



A RARE SPIDER AT WARD, COLO. 

 Ortmann, writing on the distribution of crayfishes {Cambarus), remarks that a com- 

 mon and widely distributed species will often have distinct but allied species occupying 

 smaller areas about the boundaries of its range. Steatoda borealis Hentz, a spider of the 

 family Theridiidae, is such a widely distributed form; and in our region has been found 

 at Fort Collins and West Cliff, Colo., and in the White Mountains of New Mexico. At 

 Albuquerque, N. M., Mr. Soltau discovered a new species, 5. grandis Banks, allied to 

 S. borealis. This 5. grandis has since been found in California, where it is the only known 

 Steatoda; so it doubtless has a wide range in the Southwest. From Colorado, Thorell 

 long ago described another species, 5. distincta, collected at Manitou. This has remained 

 very little known, but I was so fortunate as to rediscover it last July at Ward, the specimen 

 having been identified by Mr. N. Banks. As Ward has an altitude of about 9,000 feet, 

 the species is probably characteristic of the mountains. 



AN ADDITION TO THE SPIDERS OF NEW MEXICO 



Ariadne bicolor, determined by Mr. N. Banks, was collected by Mrs. Cockerell and 

 Miss Mary Cooper at San Geronimo, N. M., a few years ago. This adds a species, genus, 

 and family (Dysderidas) to the fauna of New Mexico. Since the pubHcation of the Ust of 

 New Mexico Arachnida,' Mr. Banks has described as new two spiders collected by myself: 

 Lycosa apicata from Las Vegas and Las Cnices, and Syspira pallida from Mesilla Park- 



COLEOPTERA 



BEETLES NEW TO COLORADO 



An admirable list of the beetles of Colorado, by Professor H. F. Wickham, appeared 

 in the Bulletin oj the Laboratories oj Natural History of the Iowa State University, in 

 1902. Mr. H. C. Fall has kindly identified a few beetles which I have recently collected 

 'n Colorado, and some of them appear to be worthy of record. The most interesting is a 

 Carabid, Bradycellus calijornicus Leconte, found at Ward, q,ooo feet. This is a Cali- 

 fornian species, quite unexpected in Colorado. Mr. Fall writes concerning the matter: 

 "5. calijornicus and B. tantillus cover the country between them. The two are with 

 diflQculty separable and are quite likely not distinct. The Ward example is certainly not 

 separable from Cahfornian specimens in my collection." 



Oxacis bicolor, collected at Boulder, is new to Colorado, being the fourth species of 

 (Edemeridae in the list. The genus, which is also new to the list, is southern, and has 

 three species in New Mexico. 



« Banks, Proc. Acad. Nat. Set., Phila., 1901. 



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