154 



PROCEEDINGS OF THE ACADEMY OF 



[April, 



Brunswick, VIII, 30, 1911, (H.), 



1 juv. 9 . 



Homerville, VIII, 27, 1911, (R. & H.) 



2 juv. d\ 5 juv. 9. 

 Hebardville, V, 15, 1915, (H.), 6 <? , 



79. 

 Suwannee Creek, VIII, 28, 1911, (R. & 



H.), 2 juv. tf, 2 juv. 9 

 Billy's Island, VI, VII, 1912, 2 <?; 



IX, 1-5, 1913, 1 juv. d 1 , (all J. C. 



Bradley). 

 Honey Island, VI, 1, 1912, (J. C. 



Bradley), 2 9. 

 Albany, VIII, 1, 1913, (R. & H.), 



1 juv. c\ 4 juv. 9 . 

 Spring Creek, VI, 7-23, 1911, (J. C. 



Bradley), 1 9 . 



Florida. 



Jacksonville, V, 1885, (W. H. Ash- 

 mead), 19, [Hebard Cln.]; VIII, 

 25, 1911, (R. & H.), 1 juv. d\ 1 

 juv. 9; XI, 3, 5, 1913, (W. T. 

 Davis), 19,1 juv. d", 1 juv. 9 . 



Atlantic Beach, VIII, 24, 1911, (R. & 

 H.), 2 juv. <?. 



Pablo Beach, XI, 4, 1911, (W. T. 

 Davis), 1 juv. d\ 1 juv. 9. 



Live Oak, VIII, 26, 1911, (R. & H.), 

 few very small juv. seen. 



Cedar Keys, VI, 1 d\ [U. S. N. M.]. 



The immature examples before us taken in August and September 

 are almost all in the instar in which females are 17-18 mm. in length, 

 excepting those from Augusta, Warm Springs, Macon and Albany, 

 Georgia, in which series females average 13 mm. and five from Au- 

 gusta and Albany average 8 mm. The majority of young from Georgia 

 and northern Florida taken in November and December show little 

 increase in size over those taken in August, females measuring 

 20-21 mm. in length, though the following instars are also represented 

 by females measuring 26 and 32 mm., respectively. It is in these 

 later stages of development that the insects remain, and are active 

 except on the coldest days, throughout the winter in southern Georgia 

 and northern Florida, adults beginning to appear toward the middle 

 of April. The presence in the series of an adult female taken in 

 November shows that occasional mature individuals continue even 

 into the early winter, but evidence shown by past and present study 

 gives convincing proof that the species appears adult over the greater 

 part of its range in late April and mature individuals have become 

 scarce as early as August. In central Florida, however, the species 

 passes the winter in the adult condition. 



An interesting feature in the development of the male subgenital 

 plate is demonstrated by the present series. Immature males, 

 until they have reached a length of 12.5 mm., have this plate very 

 short, not projecting beyond the apex of the abdomen, with caudal 

 margin acute-angulate emarginate; in the following instar (length 

 18 mm.) the attenuate and greatly produced subgenital plate of the 

 type of the adult insect appears. 



In the large series of immature examples before us, those of the 

 brown color phase are somewhat more numerous than those marked 

 with green. 



