ARGIA. 93 
d. Rear of the head pale. Pale (blue or violet) antehumeral stripe three-fourths to one and a fourth times as 
wide as the black mid-dorsal stripe. Black humeral stripe, at mid-height, one-fourth as wide as the pale 
antehumeral, a mere line in its upper half, not forked. Segment 2 blue, each side with a broad, black, 
longitudinal stripe, bilobed at its hinder end, not reaching the apex of the segment nor uniting with its 
fellow of the opposite side ; 3-7 blue (sometimes violet), each side with a longitudinal postbasal streak 
and the apical sixth to fourth of the segments black; on 7 the streak and the apical black are united, 
on 3-6 they are usually distinct, but are sometimes united even in individuals from the same locality ; 
8 and 9 blue, unmarked, or each side with an inferior, longitudinal, black stripe as long as each segment, 
or for the apical third on 8 and entire length of 9. These colour-variations exist in one and the same 
locality, e.g. Teapa. 
¢. Differs from the male as follows :—Black stripe on segment 2 sometimes triangularly dilated, not bilobed, 
at hinder end, and with a separate, inferior, elongated, black spot, or 2 may be marked as in A. vwida 9; 
8 pale, unspotted on dorsum, each side with a variable inferior black stripe; segment 9 pale, dorsum with 
a black stripe each side in its basal half, and each side inferiorly often with a black stripe as long as 
the segment. 
3 2. Pterostigma of the front wings, °8 ¢, 1 mm. ? long, surmounting more than one cell (78°/o 3 @), 
one cell (20 °/, g, 17 9/o 2), or less than one cell (2 °/, 3, 5 °/, 2); of the hind wings, ‘9 d, 
1mm. ¢ long, surmounting more than one cell (74 °/5 d, 78 °/o 2), one cell (24°/, 3, 20°/, 9), or less 
than one cell (2 °/, 3 9). 
Antenodal cells on the front wings 4 (88°3 °/, 3, 87 °/o 2), 34 (6 %/o 2), 83(11 Jo 3, 6 %o 2), 44+ (1% 2); 
or 5 (66 °/, 5); on the hind wings 3 (946/, 3, 97°/o 2), 4(4°%o 5,3 %Jo 2), 3+ (66% 5), or 
. 2 (66 °/, 3). 
Dimensions.—Abdomen, ¢ 25°5-30, 9 23-285; hind wing, ¢ 18-23, 2 19-23:5 mm. 
Hab. Mexico, Tampico 12, Tepic (Hisen & Vaslit, coll. Calif. Ac. Sci.: 2 3), Sierra 
Madre, Tepic (Richardson: 2 2 ), Guadalajara (Schumann: 2 2 ), Sierra Madre (Buchan- 
Hepburn, coll. McLachlan: 1 ¢ ), Jalapa (Trujillo: 2.3; Rhoads: 1 2 ), Texolo (Rhoads : 
10 ¢, 24 2), Huatusco (coll. Adams: 5 3,22), Atoyac (H. H. Smith, Schumann : 
6 $,12), and Orizaba (F..D.G.: 6, 5 2) in Vera Cruz?, Cuernavaca (coll, Adams: 
23,12; coll. Deam, 33,22; Barrett, coll. P. P.C.:3 3,389), Chilpancingo [4 ¢ ], 
Amula [1 ¢ ], Acaguizotla [1 ¢,1 2], and Rio Papagaio [1 ¢] in Guerrero, Teapa 
in Tabasco [9 g, 11 9] (A. H. Smith); Guatemata? (coll, Adams: 26,12; 
M.C.Z.: 11 6,4 2), Guatemala city [4 ¢, 3 2 ], Zapote [8 2 ] (Champion); Costa 
Rica (Van Patten: 1 3), Irazu [29], Caché [6 3,7 2] (Rogers), San Francisco 
(Rogers, coll. McLachlan: 2 3, one labelled “ extranea” in de Selys’s handwriting). 
—Co.omBia2; GUIANA, Surinam ?. 
Apparently found throughout the year, to judge from the dates on the specimens 
examined. 
In a general way, it seems that the relative and absolute length of the lower branch 
of the inferior appendage increases in specimens from north to south, 7. é. in those from 
Mexico to Costa Rica; nevertheless, at least one male from Texolo in Vera Cruz has 
this branch quite as long as in individuals from Central America. I have not been 
able to find any correlation in coloration with differences in length of this branch. 
There seem to be no colour-differences between the females of A. extranea and 
A. vivida, all the variations of the latter being shown by the former (although not vice 
versa). The distinction between the females of these two species, based on the form 
