258 NEUROPTERA. 
well-founded, the preceding description will perhaps enable this species to be recognized 
and its proper name determined. See also, however, a letter from Mr. Kirby quoted 
under E. connata, e, page 262. If the M. C. Z. specimens really are Krichson’s 
unimaculata, and if they prove to be different from the ‘‘ many specimens” from Brazil 
referred to erichsoni by Mr. Kirby in Ann. & Mag. Nat. Hist. (6) xix. p. 603 (1897), 
erichsoni, Kirby, 1897, is not the same species as erichsoni, Kirby, 1894. 
5. Erythrodiplax unimaculata. 
Libelluta unimaculata, De Geer, Mém. Hist. Ins. iii. p. 558, t. 26. fig. 5 (1773)*; Rambur, Névr. 
p- 111 (1842) ”. 
Diplax unimaculata, Hagen, Syn. Neur. N. Amer. p. 318 (1861) *. 
Trithemis unimaculata, Calvert, An. Mus. Nac. Buen. Aires, vii. p. 29 (1899) *. 
Libellula pulla, Burm. Handb. Ent. ii. p. 853 (1839) °; Calvert, Trans. Amer. Ent. Soc. xxv. p. 75, 
t. 1. fig. 10 (genit. ¢) (1898) °. 
Diplax ochracea, Hagen, Syn. Neur. N. Amer. p. 181 (1861) (in part., Surinam ¢ only). 
3. While most of the males before me are more or less pruinose on the abdomen, the others indicate that the 
colour-changes due to age are very similar to those of erichsoni?, g.v. The youngest are younger than 
any of that species and possess the colours of the female. Pulla, Burmeister °°, is a stage rather more 
advanced. 
©. The females which I refer here agree exactly with the preceding description of this sex of erichsoni?, 
except in the extent of the yellow colouring at the bases of the wings; it reaches to the submedian 
cross-vein (Surinam) or to the internal triangle (Obispo) on the front wing, to or into the discoidal 
triangle on the hind. 
Dimensions—Abdomen, ¢ 19-22, 9 19°5-21; hind wing, ¢ 23-5-28, 9 25-28; costal edge of stigma, front 
wing, 2°5-3°5 mm. 
Hab. Panama, Obispo | Hassler Exped.: 1 9 |.—Gutana, Surinam 12567 [2 ¢,2 2], 
Paramaribo |Thorey: 1 3] (M. C. Z.) (Miss K. Mayo, A. N. S.: 13); Brazit, 
Para * (Thayer Exped., M. C. Z.: 3 3), Pernambuco?; Paraguay, San Pedro? (coll. 
P.P.0: 36). 
De Geer’s figure ! of the wings agrees so well with the present specimens and with 
my detailed description ® of Burmeister’s type of pulla, that I think the identification 
is safe. Mr. Kirby (Ann. & Mag. Nat. Hist. (6) xiv. p. 263, 1894) brings together as 
synonyms of pulla three nominal species—ochracea, Hag., fervida, Erichs., and justind, 
Selys—all of which have red fronts, while pud/a, Burm., has a metallic-blue front. As 
this identification is surely an error, it is not certain to what species Mr. Kirby’s 
examples from Grenada, W.I., really belong. Some further remarks will be found 
in two of the papers quoted above®® page 13. What the unimaculata of Burmeister 
is ] will not attempt to say. 
The general appearance of unimaculata, De G., is paralleled by members of the 
Erythrodiplax connata complex (e’, f'), but the genital hamule furnishes a ready 
means of distinction, as indicated in the key on pages 248, 249. 
