1867.] 299 [Scudder. 



Libellula vinosa=Dythemis rufinervis. 



My specimens disagree decidedly with Dr. Ilagen's description; 

 the dorsum of the thorax of both male and female has an obsolete 

 yellow line ; the sides are not yellowish, four-striped with ochraceous 

 yellow ; there is no dorsal black stripe on the eighth and ninth ab- 

 dominal segments; the appendages are not rufous, but always havo 

 the apical half blackish. No mention is made by Dr. Hagen of the 

 infuscation of the wings at tips ; my specimens are all smaller than 

 Dr. Ilagen's measurements. 



Maeromia cubensis=Erytheinis longipes, var. specularis. 



Besides having tuberculated eyes, in which they agree with the 

 diagnosis of Cordulina, my specimens accord with the meagre gen- 

 eric characters given by Dr. Hagen to Maeromia. I therefore placed 

 them at once in that group. Dr. Hagen states that the color of the 

 abdomen is rufo-fuscous, like that of the mouth and thorax, but, in 

 my specimens, it is not so. 



Tramea insularis=T. abdominalis. 



It is impossible to refer the males of my collection to T. ahdomina- 

 lis. In the markings of the front and vertex; the color of the feet; 

 the length of the fascia at the top of the dorsum of the abdomen; 

 the length of the superior anal appendages ; the length of the hamule 

 and the color of the ptcrostigma — the only trenchant distinctive 

 characters mentioned by Dr. Hagen — the specimens agree completely 

 with T. insularis, and disagree as entirely with T. abdominalis. The 

 female, however, does not accord with the descriptions of either; on 

 the one hand, the markings of the head and vertex differ from those 

 of T. insularis, in the manner described in my previous paper, and the 

 terminal segment of the abdomen has a black fascia, continuous with 

 that of the preceding segment: on the other hand, the fulvous ptcro- 

 stigma and the rufous base of the black femora, do not agree with the 

 cdiaractcrs Dr. Hagen assigns to 7'. abdominalis. When such slight 

 distinctive characters are given by which to separate these two spe- 

 cies, and especially when these characters are equally balanced in a 

 single specimen, it is diflicult to decide where to place it. 



Mesothemis Gundlachii=M. simpIieicoUis. 



My specimen differs from Dr. Hagen's description of M. simplicicol- 

 Z<s in having the sides of the thorax nearly immaculate; the slight 

 markings which occur are of a pale brown, and, by no means, black. 

 Also, and more especially, the sides of the abdomen are not in the 

 least "broader before the apex," but strictly parallel; this may be due 

 to distortion in drying. There are more markings on the dorsum of 



