NEW DRA GON-FL Y NYMPHS— NEEDH A M. 709 



with very short spinules at regular intervals along its straight sides. 

 Mental seta? 13, the second to sixth longest. Lateral seta> lo-ll. teeth 

 on opposed margins of lateral lobes serrate, small, uni-spinulosc 



Abdomen similar to that of T. aurora^ without dorsal hooks, with 

 minute lateral spines on segments 8 and 9, sometimes aparently wanting 

 on 8, on *•> perhaps one-tif th as long as that segment; segment 10 annular, 

 included in the apex of the ninth; appendages as long as 9 on the ven- 

 ti-al side, superiors a little shorter than inferiors, suddeidy contracted 

 to a slightly declined tip, laterals a little shorter, three-fourths as long 

 as inferiors. 



On Plate XLI, figs. 6-10, I bring together figures of the nymphs of 

 the typical Trifhe)iiis aurora and of two aberrant species that are some- 

 times referred to the same genus, T. frlviaUs and T. mlnKMcuhu and on 

 Plate XLIV I bring together the wings of the same species. To I>iphi- 

 codes belongs, I think, irivialU^ for reasons well indicated by Doctor 

 Kriiger.'^' The single crossvein under the stigma with a long vacant 

 space before it, combined with the cubital branches of the hind wing 

 separated at their departure from the triangle are very characteristic. 



As to T. minuscula^ with its more elongate nymph, its reduced 

 venation, short anal loop and single row of cells between the radial 

 sector and its supplement, I agree with Doctor Ris,'' that it, together 

 with its nearest tropical American allies, will eventually have to be 

 separated from Trithemis as a new genus. 



TRITHEMIS MINUSCULA Rambur. 

 Plate XLI, fig. 10. 



Full-grown nymphs collected at Gotha. Orange County, Florida, in 

 January, 1807. While the species was not bred, its identification is 

 positive, because the venation of the imago is fully indicated in the 

 wings of the well-preserved nymphs, and is munistakable among th(> 

 species that belong to Florida. Imagos were sent from th(^ same 

 locality a little later in the season. 



The nymph measures in total length 12 nun., abdomen 7 nun., hind 

 femur 8. .5 mm.; width of head 3.5 mm., of al)domen 4 nun. 



Body stout, nearly smooth. Head sonu'what depressed, especially 

 across the front, which is fiush with the very prominent and large eyes, 

 narrowed behind the eyes to the nearly straight hind margin. 

 Antennje slender, shorter than the head; ratio of length of segments 

 from the base outward: 1 : 1.2 : 2.2 : 1.2 : 1.2 : 2 : 2. Labium with 

 hinge reaching ])ackward to the mesothorax; median lobe very ]u-oin- 

 inent, its front ))order not crenulate, but with a row of rather regu- 

 larly arranged spinules along the luai-gin on either side and a pair 

 close together at the tip of the median tooth-like prolongjition. 



f'Stett. Ent. Zeit., 1902, p. 127. '' Ent. News. XIV. |.. 219. 



