156 UNIVERSITY OF COLORADO STUDIES 



Amer. Assn. Adv. Set., 1883, pp. 398-399. Discusses the Sequoia stumps 

 and associated leaf impressions at Florissant, particularly the extremes o 

 annual growth rings, and suggests the possibility of hot silicious waters from 

 volcanic springs. 



WiLLisTON, S. W. "Some interesting new Diptera." Trans. Conn. Acad. Arts 

 and Sci., New Haven, Conn., Vol. IV, 1880, pp. 243-246. Discusses some 

 . Florissant species. 



****** "Synopsis of North American Syrphidae." Bull. U. S. Nat. 

 Mus., No. 31, 1886. Contains a brief section on geological distribution, includ- 

 ing Florissant species, but incorrectly cites the U. S. Geol. Sur. instead of Hay- 

 den Survey or U. S. Geol. and Geog. Sur. of the Terr., the two surveys and 

 their publications being distinct and each having published bulletins, etc., 

 bearing the same numbers. 



Von Zittel, Karl A. Text-book of paleontology. American edition, 1900, Vol. 

 I, pp. 682-691. Figures some Florissant species to illustrate genera. 



