44 Journal New York Entomological Society, t^'o'- xxi-^. 



to the central parts of North America, only three or four of the 

 species of Okanogana and Platypodia reaching California, and then 

 often showing some variation from Colorado specimens. 



Among the several species most likely to be collected in the future 

 in Colorado and thus added to the present list are : 



Tibicen aurifera (Say). 



Common in Kansas, and recorded from as far west as Seward, near 

 the western part of that state at an elevation of 2,600 feet. This 

 species was figured in the Journal, N. Y. Entomological Society, 

 March, 1916, PI. 3, fig. 4. 



Tibicen resh (Haldeman). 



Received from Elk Co., Kansas, 1,008 ft. (R. H. Beamer), and 

 figured in Journal, N. Y. Entomological Society, March, 191 5, PI. 

 I, fig- 3- 

 Tibicen eugraphica (Davis). 



A very common species in parts of New Mexico ; we have a male 

 from Albuquerque, Bernalillo Co.. which is within 140 miles of the 

 Colorado line. From 160 miles to the east we have seen eighty males 

 and eleven females collected in Barber Co., Kansas, July 19-21, 

 1916, 1,468 ft. elevation, by Mr. R. H. Beamer. This species is usually 

 found in dry situations. It was described and figured in the Journal, 

 N. Y. Entomological Society, March, 1916, PI. 5, fig. 3. 



Tibicen vitripennis (Say). 



Examined from both Nebraska and Kansas, so may possibly occur 

 in Colorado. Figured in the Journal, N. Y. Entomological Society, 

 March, 1916. PI. 6, fig. 3. 



Okanagana striatipes (Haldeman). 



A more western species common in parts of Utah and Arizona, 

 but likely to occur in Colorado as well. This species is considered in 

 the Journal, N. Y. Entomological Society, June-September, 1919, p. 

 215, and a figure is presented on the plate accompanying the present 

 article. 



In 1895 Prof. C. P. Gillette and C. F. Baker publislied a Prelimi- 

 nary List of the Hemiptera of Colorado, as Bulletin 31, Agricultural 

 Experiment Station, State College of Colorado. They enumerated 

 nine species, namely: 



