ARGIA. 83. 
blue on dorsum of segments 3 and 4 (other than the basal ring) reduced to a median line almost as lon? 
as each segment; 8 black, apical half of dorsum only blue; 9 like 8 of male, or with the apical dorsal 
blue reduced to the terminal third of the segment. 
3 9. Pterostigma of the front wings, "8d, ‘9 2 long, of the hind wings, 1:18 g, 1:13 mm. ? long, 
surmounting more than one cell on all. 
Antenodal cells on the front wings 4, on the hind wings 3, in all cases. 
Demensions —Abdomen, ¢ 25, 9 23; hind wing, ¢ 9,18 mm. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith: 3 3,12); Nicaracua(U.S.M.M.: 
13,292). 
In both sexes the wings have a yellowish tinge, which in the Nicaraguan females is even 
smoky. ‘This species agrees in some respects with Selys’s description of A. tinctipennis, 
but. according to Hagen’s drawing, differs from it in the form of the male appendages. 
Had I not seen this drawing I should have identified A. indicatriz as A tinctipennis; and 
this fact leads me to suggest that the two males from La Chorrera, Panama, referred 
to A. tinctipennis by Kirby [Ann. & Mag. Nat. Hist. (7) iii. p. 371 (1899)], may really 
be A. indicatriz. The specific name indicatrix is suggested by a resemblance of the 
superior appendage in oblique view (fig. 39s) to a hand with the index-finger extended. 
15. Argia rogersi, sp.n. (Tab. IV. figg. 40, 40s.) 
¢. Rear of the head black. Thoracic dorsum black, with a slight metallic-green reflection; no pale ante- 
humeral stripe; the humeral stripe concolorous and continuous with the thoracic dorsum, and reaching to 
the first lateral suture, not cleft nor enclosing any pale colour. Segment 2 black, with a mid-dorsal, oval, 
blue spot reaching to three-fifths of the length of the segment and continued in one male as a narrow 
prolongation to the apex; 3-7 black, 3 with a transverse, basal, blue ring prolonged on mid-dorsum to 
two-fifths of the length of the segment and ending in a sharp point, 4 with a small, mid-dorsal, basal, 
blue spot; 8 (very much faded) possibly blue, with an inferior black stripe each side as long as the 
segment; 9 (much faded) probably blue, with an inferior black stripe each side as in 8. 
Pterostigma of the front wings 1:18 mm. long, surmounting more than one cell; of the hind wings 1 mm. long, 
surmounting more than one cell, except on one wing, in which it surmounts one cell. 
Antenodals on the front wings 4, on the hind wings 3 (except in one wing of one male, in which there are 4). 
Dimensions.—Abdomen 31°5 mm., hind wing 24 mm. 
© unknown. 
Hab. Costa Rica, Caché (Rogers: 2 3). 
The female of this species may be what I have here called A. difficilis, or another 
broken specimen of the same sex from Bugaba contained in Mr. Godman’s collection, 
but which I do not describe on account of its imperfection. ‘There is no evidence, 
however, that either of these is the other sex of the males from Caché. d. rogerst 
agrees very nearly with Selys’s descriptions of A. collata and of A. reclusa. It differs 
greatly, however, from A. collata in the form of the appendages, judging from Hagen’s 
drawing, and also in the absence of pale marks on the labrum and on the thoracic 
dorsum. ‘The Costa Rican insect has appendages very like those of A. reclusa, to judge 
from Hagen’s drawing of them, but differs from Selys’s description of that species in its 
larger size, longer pterostigma, four antenodal cells on the front wings, and the absence 
m2? 
of blue on the labrum, nasus, and thoracic dorsum. 
