1916.] 



NATURAL SCIENCES OF PHILADELPHIA. 



93 



Spring Creek, Decatur County, eleva- 

 tion about 110 feet. Numerous 

 dates. (J. Chester Bradlev.) [Ga. 

 St. Cln.] 



Stone Mountain, De Kalb County, 

 elevation 1,050 to 1,686 feet. Vicin- 

 itv of same, elevation 950 to 1,050 

 feet. VIII, 3, 1913. (R. A: H.) 



St. Simon's Island, Glvnn Count v, IV 

 to Y, 1011 and L912. (J. Chester 

 Bradlev.) [( la. St. Cln.] VIII, 30, 

 1911. (R. &H.) 



Suwanee Creek, Lot 328, 12th Dis- 

 trict, Okeefenokee Swamp, Charlton 

 County. VIII, 28, 1911. (R. &H.) 



Tallulah Falls, Rabun County, eleva- 

 tion 1,630 feet, VIII, 1887. [U. S. 

 N. M. and Bebard Cln.] VII, 1910. 

 (Davis.) [Davis Cln.] 



Thomasville, Thomas County, eleva- 

 tion 250 feet. Various dates. (H. 

 and R. & H.) 



Thompson's Mills, Jackson County, 

 elevation cannot be ascertained. 

 Various dates. (H. A. Allard.) 

 [U. S. N. M.] 



Tifton, Tift County, elevation 370 

 feet. IX, S, 1910." [Ga. St. Cln. J 



Toccoa, Stephens Coilntv, elevation 

 1,094 feet. VIII, 4, 191.3. (H.) 



Tuekoluge Creek, Rabun Count v, 

 elevation 1,600 to 2,600 feet. VII, 

 1910. (Davis.) [Davis Chi.] 



Tvbee Island, Chatham County. IX, 

 2,1911. (R. &H.) 



Warm Springs, Meriwether County, 

 elevation 850 to 1,200 feet. VIII, 

 9 to 10, 1913. (R.) 



VYavcross. Ware Countv, elevation bis 

 feet. VIII, 11, 1903. (Morse 

 [Morse Cln.] 



Wilson Gap, Mountain City, Rabun 

 County, elevation cannot be ascer- 

 tained! VI 11, 22, 1913. (J. Chestei 

 Bradley.) [Ga. St. Cln.] 



Florida. 



VIII. 



Atlantic Beach, Duval County. 



24 to 25, 1911. (R. & H.) 

 Fernandina, Nassau County. (W. H. 



Finn.) [U. S. X. M.] 

 Hastings, St. John Countv. Various 



dates. (A.J.Brown.) [Morse Cln.] 

 Indian River, Volusia and Brevard 



Counties. 1896. (T. J. Priddey.) 



[Hebard Cln.] 

 Jacksonville, Duval County. Various 



dates, collectors and collections. 



Examined by authors, VIII, 25, 191 1 . 

 Live Oak, Suwanee Countv, elevation 



100 to 120 feet. VIII, 26, 1911. 



(R. &H.) 

 Ortega, Duval County. IX, 6, 1913. 



(Davis.) [Davis Cln. 1 

 Pablo Beach, Duval Countv. IX, 5, 



1913. (Davis.) [Davis Cln.] 

 South Jacksonville, Duval County. 



IX, 7, 1913. (Davis.) [Davis Cln.] 

 St. Augustine, St. John County. XI, 



8, 1911. (G. P. Englehardt.) [B. I.] 



Distributional Summary. 

 Two important influences or sets of factors quite evidently control 

 the distribution of the Dermaptera and Orthoptera in the area 

 studied, these influences being the same which largely control the 

 character of the biota of any region. The two are: physiography 

 and immediate environment; temperature and climatic regions or 

 life-zones. The two influences share equally in controlling the 

 distribution of certain species, but in numerous cases one and not the 

 other is the governing factor. It seems best, therefore, to summarize 

 our distributional generalizations separately under each of the 

 main divisions. We must always bear in mind that a fauna is not 

 a fixture, but a complex constantly changing and modifying, either 

 through the evolution of its own living components or the modifica- 

 tion of its own limitations by readjustment of its physical or climatic 

 barriers. Of the first grouping the effect of immediate environment 

 is best studied in a relatively circumscribed area and, other things 

 being equal, the occurrence of the environment is controlled by the 



