ARGIA. 81 
Pterostigma surmounting more than one cell on all the wings, 1 mm. long on the front, 1:13 long on the hind. 
Antenodal cells on the front wings 4 (83:3 °/o) or 4+ (16-6 °/,); on the hind wings 3 (66°6 °/o), 4 (16°6 9/0), 
or 3+ (16°6 9/,). 
Dimensions.—Abdomen 27°5, hind wing 20 mm. 
© unknown. 
Hab. Panama, Chiriqui (coll. Adams: 1 ¢ ), Bugaba (Champion: 2 ¢ ). 
Named after Mr. C. C. Adams, of Bloomington, Illinois, whose collection of Argia, 
lent with the greatest liberality, has been an important source of knowledge for the 
present work. 
11. Argia oculata, (Tab. IV. figg. 11, 36, 36s, 362, 36 id.) 
Argia oculatu, Hagen, in Selys, Bull. Acad. Belg. (2) xx. p- 409 (1865) *. 
d. Rear of the head black, often with a pale stripe along the eye-margins, whose width varies so that neither 
colour predominates. Pale (blue, sometimes violet) antehumeral stripe from one-sixth to slightly more 
than one-half as wide as the black mid-dorsal. Humeral stripe of nearly uniform width, not forked, 
usually enclosing a comma-shaped blue spot in its upper end, from one to three times as wide as the pale 
antehumeral, Segment 2 blue, sometimes violet, each side with a wide black stripe united with its fellow 
of the opposite side on the dorsum at base and usually at apex, thus leaving between them-an oval blue 
or violet spot ; 3-7 black, witha very narrow, pale, transverse, basal ring, and a mid-dorsal stripe on 3-6, 
pointed at its hinder end on each segment, its extent varying from the basal sixth to three-fifths on 6, and 
proportionally rather more on 3-5; 8-9 blue, each side with an inferior black stripe as long as each 
segment, or not quite reaching the base on 8. 
¢. Differs from the male as follows :—Pale antehumeral stripe one-third to one-fourth as wide as the black 
mid-dorsal. Humeral stripe as wide as the antehumeral. Oval spot on segment 2 yellow, smaller than 
in the male, sometimes absent ; mid-dorsal stripe on 3-5, not on 6, occupying the basal three-fifths or less 
on 5, proportionally more on 3 and 4; 8 and 9 coloured as in male, but with the addition of a transverse, 
basal, black band, which connects the two lateral stri pes and whose hind margin is prolonged into two short 
stripes (one on either side of the median line) on the dorsum of each segment, 
3 . Pterostigma of the front wings ‘9 mm. long, surmounting more than one cell (58°75 °/, 5,39 °/, 2), one 
cell (37°38 °/, 3, 53 °/y Q ), or loss than one cell (3°5 °lo 3,8 %o 2); of the hind wings -9-1-1 mm. long, 
surmounting more than one cell (55-2 °/, 3, 36 °/o 2), one cell (43 °/, 3, 64 °/ 2), or less than one 
(18 %Jo 3). 
Antenodal cells on the front wings 4 (88 °/, ¢, 893 °lo 2), 5 (43 7, S, 26 Jo 2), 3 (6%, 5,8 °lo Q), or 
4+ (1°8°/, 3); on the hind wings 3 (79°8°/, 3, 89°3°/, 2), 4(17°5 °/o 3,106 °%/, 2), or 8+ (2°6 9, g ). 
Dimensions.— Abdomen, 3 28-32°5, 2 25-30; hind wing, ¢ 20-23, 2 21-235 mm. 
Considerable variation in the length of the lower branch of the inferior appendages of the male exists. 
Hab. Mexico, Tepic [1 ¢ }, Misantla (F. D. G.: 1 ¢,1 9), Jalapa (Trujillo: 1-g ), 
and Atoyac (Schumann, H. H. Smith: 16 ¢, 12 9) in Vera Cruz, Putla (coll. 
McLachlan: 1 3, labelled “ meaicana” in de Selys’s handwriting), Amula [1 ¢,1 2], 
Chilpancingo [1 ¢ ], Tepetlapa [1 3], Acaguizotla [2 ¢], and Dos Arroyos [2 ¢, 
1 ¢] in Guerrero (4. H. Smith), Isthmus of Tehuantepec (Sumichrast, M. C. Z.: 
2d), Teapa in Tabasco (H. H. Smith: 6 3); Guaremata (coll. Adams: 10 3,2 2 ) 
Livingston (4. Wilson, M.C.Z.: 13); Payama, Bugaba (Champion: 1 ¢ ), Isthmus 
of Panama (coll. ddams: 3 ¢,1 9 ).—CoLomBta, Bogota !, Sta, Fé de Bogota (Lindig, 
M.C.Z.: 13); Vuvxezveta (M. C.Z.: 6 3), La Guayralh 
Taken in most of the months of the year, but not continuously at any one place. 
BIOL. CENTR.-AMER., Neuropt., January 1902. mM 
