ERYTHRODIPLAX. 257 
side, of the internal triangle on the front, the distal angle of the discoidal triangle on the hind wing; on 
the latter, the edge of the white curves toward the anal angle forming an arc of about 90°. 
Q. Vertex obscure brownish with a slight metallic-blue reflection, two basal yellow spots behind; frons and 
elypeus greenish (or in one almost orange), the former with a small but distinct, superior, metallic-blue 
spot immediately in front and on each side of the anterior ocellus, but not reaching to the anterior frontal 
surface ; lips, thorax, bases of femora, and most of abdominal segments 1-3 yellow ; thorax with brownish 
markings on dorsum and sides as described above for the Esparta males, but the venter is also yellow ; 
carine and sutures of 1-3, a median longitudinal band, and an infero-posterior spot on each side of the 
dorsum of 3, black or dark brown; most of 4-7 and all of 8 and 9 dark brown to black, 4-7 with a 
longitudinal stripe or spot on each side of dorsum, decreasing in length on each successive segment, 
yellow ; most of 10 and of the ventral surfaces of 1-10 yellow; appendages yellow, about twice as long 
as 10, not so long as 9. Colouring at the bases of the wing pale yellow, reaching at most to the first 
antecubital and submedian cross-vein on the front wing, and the level of the first antecubital on 
the hind. 
3 2. Front wings, post-triangular field: three cells or rows, then two cells increasing to three rows proximal 
to the level of the nodus. Hind wings with two post-triangular rows increasing, 7-9 antecubitals, 
usually 8. 
Dimensions.—Abdomen, § 19-5-22'5, 9 20-205; hind wing, g 24-27, Q 25:5-26°5 ; costal edge of stigma, 
front wing, ¢ 2°5-3°5, 9 3 mm. 
The differences in size among the present material are not geographical. 
Other details are given on page 248. 
Hab. Costa Rica, Esparta (Biolley, coll. Kahl: 4 3).—Cotompia, Don Diego in 
Dept. Magdalena (#. ZH. Smith, Carn. Mus. Pittsb.: 2 3); Venezunta [Appun: 1 3, 
3 Q |, Puerto Cabello (2 ¢,2 2]; Gurana[1 3]; Braz [1 ¢; Mrs. Munroe: 1 3}, 
Bahia [1 ¢ | (M. C. Z.), Rio Janeiro (H. H. Smith, Carn. Mus. Pittsb.: 1 3). 
Taken at Esparta in February on the “muddy banks of the brook Chingo,” in 
November at Rio Janeiro. 
The name erichsoni! is not accompanied by a description *, but was given to 
specimens described as unimaculata, De Geer, by Erichson 2, but believed by Mr. Kirby 
to be different from the true wnimaculata of De Geer. I do not find sufficient precision 
in Erichson’s description to enable one to determine whether his specimens were or 
were not conspecific with De Geer’s, and Mr. Kirby does not state that he has seen 
Erichson’s examples. I should not use the name “ erichsoni,” even in the doubtful 
way in which I do, were it not for the fact that the Guiana and the first Brazilian 
males cited above from the M. C. Z. each bear a printed label “Mus. Berol.,” 
and written labels “wnimaculata, Degeer, Guyana,” “ unimaculata, Degeer, Brasil,” in a 
hand unknown to me. ‘These written labels appear to be of considerable age, and the 
specimens may be Erichson’s or named from comparison with his. On the possibility 
of this conjecture proving correct, I have employed Mr. Kirby’s name; if it be not 
* Mr. Kirby, indeed, says * that erichsoni “differs from pulla in the adult male being pruinose, and the 
vertex steel-blue in both sexes” ; but since his ideas on the specific value of pruinosity are, I believe, totally 
incorrect, and since erichsont and pulla (=unimaculata, De Geer) do not differ as he states, the expression in 
the text is perhaps not too strong. If Mr. Kirby’s pudla is the same as fusca, Rambur (see page 262), the 
contradictions are partly explained. 
