Zool.— Vol. I.] CALVERT— ODONATA. 403 



expressly says (p. 325), " Drury's figure was taken from a 

 Jamaica specimen, and although it is rough 1 and probably 

 represents too many costal nervures, the subtriangular space 

 of the fore wings is distinctly represented as consisting of 

 two cells." An examination of Drury's figure will show 

 that Mr. Kirby's description is true only for the right front 

 wing, as the left front wing has the subtriangular space just 

 as distinctly represented as consisting of three cells. More- 

 over, although Mr. Kirby's description of domitia 2 states 

 that the [discoidal] triangles are free, the same figure of 

 Drury's shows the triangle to be crossed by two veins in the 

 left front wing. Any one possessing similarly colored Peri- 

 themis from Jamaica, with the subtriangular spaces three- 

 celled and the triangles crossed on the front wings, would 

 be equally justified in regarding them as domitia Drury. 

 The bearing of the number of cells in these parts of the 

 wing on the question of specific distinction will be seen 

 farther on. 



2. Tenera Say and temiicincta Say, in spite of the great 

 difference in the coloring of their wings, are beyond ques- 

 tion female and male respectively of the same species, as 

 Hagen indicated in 1861, and as the writer and other col- 

 lectors can testify from personal experience. Why they 

 should appear as distinct from each other in Mr. Kirby's 

 Catalogue is inexplicable. 



3. "Tenuicincta" — the male — of the mainland, usually 

 has the subtriangular space on the front wings free (of one 

 cell) and all the triangles free; many individuals have a 

 brown spot of varying intensity lying in the outer ends of 

 the triangle, supra-triangular space and the adjoining cells, 

 on all the wings. Not all individuals, however, and it is 

 not uncommon to find in one and the same locality, as in 

 the vicinity of Philadelphia, some with and others without 

 these brown spots. Neither the domitia of Drury's figure, 



1 So rough that I believe it to be utterly untrustworthy as regards the venation. 



2 Ann. Mag. Nat. Hist., 1. c. 



(3) May 11. 1899. 



