xxxiii. '22] ENTOMOLOGICAL XK\VS 13 



Libellulas Collected in Florida by Jesse H. William- 

 son, with Description of a new 

 Species (Odonata). 



By E. B. WILLIAMSON, Bluffton, Indiana. 

 Mr. Jesse H. Williamson collected dragonflies in Florida 

 from March 1 to April 26, 1921. Localities visited and dates 

 are as follows : Sebring, March 1 ; Fort Myers, March 3-/ 

 and 10-19; Taxambas, Marco Island, March 8; Labelle, March 

 21-27; Moore Haven, March 29-30 and April 2; Palmdale, 

 March 31 and April 3-8; enroute Moore Haven to West 

 Palm Beach, across Lake Okeechobee, April 9; Miami, April 

 12; Enterprise, April 15-26. From April 29 to May 9 he 

 collected at Kathwood, Aikcn County, South Carolina, but on 

 these dates most of the species observed were just emerging. 

 Among the 4547 specimens collected, representing 65 species, 

 are several new and many interesting things, the most remark- 

 able and surprising of which is the fine Libellnla described 

 below. This Florida collection has been studied and arranged 

 by J. H. W. and duplicates are being distributed to students 

 and institutions. 



Libellula jesseana new species. 



Abdomen: $, 38-40; $,35; hind wing, ^ , 41-43; 9 , 43 ; stigma, 

 front wing, 6-6.8 mm. 



$ . Labium brown with a slight greenish cast ; genae and mandibles 

 similar, the latter more yellowish; labrum black; anteclypeus greenish 

 brown; postclypeus, frons, antennae and frontal vesicle black, the latter 

 nearly squarely truncate, the externoapical points shining ; occiput 

 black; rear of head brown with greenish or yellowish tinges and witli 

 a more or less distinct paler spot against the eye at midheight and 

 another larger one below this. 



Dorsum of prothorax and thorax black pruinose ; mesepimeron and 

 metepisternum similar but paler, more or less shaded, especially about 

 the humeral and second lateral sutures, with greenish or yellowish 

 brown ; the metepimeron and thorax beneath this paler color. 



Abdomen slender; above the lateral carina black , below the lateral 

 carina brown to black with a greenish or yellowish cast and a more or 

 less distinct yellowish area on either side posterior to the posterior 

 transverse carina on each of segments 2-8; sterna brown to black; 

 appendages brown to black. 



Vc-ntro-external fact- of the genital liamulc roughly triangular in 



