362 SUPPLEMENT. 
Argia tezpi (p. 77). 
3d. Some examples from Gualan, Surubres, &c. have the pale antehumeral stripe orange, a pale mid-dorsal 
longitudinal line on abdominal segments 3-8, and the sides of 8 pale inferiorly in younger individuals. 
Q. A specimen from between Gualan and El Rancho and one from Surubres have the black dorsal stripes 
fused together for their entire length on segments 8 and 9; one from Gualan has a pair of dark spots on 
the basal fourth of 10. Segments 7 and 8 have a pale mid-dorsal longitudinal line in some. 
To the localities given, add :—Mexico, Tuxpan in Jalisco (McClendon, U.S. N. M.: 
1 2), Balsas (Lutz, Field Col. Mus. Chicayo: 1 @); Guavemaa, Gualan [60 ¢,12 2, 
+ 1 pair], Zacapa [3 ¢], between Gualan and El Rancho [2 2], El Rancho [6 g, 
2 9], between El Rancho and Sanarate [3 ¢ ], Sanarate [7 g, 4 2, + 1 pair] (Wil- 
liamson, Deam, Miller, coll. Wilmsn.; Hine, coll. O. S. U.); Costa Rica, Surubres near 
San Mateo (Biolley, coll. Kahl: 4 ¢,1 2), Jesus Maria [2 ¢ ], Rio Machuca [2 2] 
(Biolley, colls. A. N. S., Wilmsn.). 
Mr. Williamson noted of this at Gualan, Jan. 14, 1905, “ A species found on rocks 
in ripples,” and Prof. Biolley, “‘ Bord de la riviére Surubres.” 
Both sexes of this species frequently, but not always, have the wings pale amber- 
colour. 
6 (a). Argia terira, sp.n. (Tab. X. figg. 3, 3s, 14.) 
3. Rear of the head black with a pale blue stripe along the eye-margins ; frons, clypeus, gene, labrum, 
postocular spots (and in some a spot between them), and a small spot between each lateral ocellus and the 
antenna of the same side, bright pale blue. Pale blue antehumeral stripe one-half to two-fifths as wide 
as the black mid-dorsal, which latter has some dark metallic-green reflection. Black humeral stripe one- 
fourth to one-half as wide as the pale antehumeral, usually forked at its upper end except when very 
narrow. A black line on the second lateral thoracic suture, and one on the upper end only of the 
obsolete first lateral suture. Abdominal segments 1 and 2 blue; three black lines forming three sides 
of a polygon, closed posteriorly, on the basal dorsal half of 1; a black stripe on each side of 2, which in 
the apical third curves toward the mid-dorsal line to meet, or not to meet, its fellow of the opposite side 
at the hind end of the segment; 3 with its basal half entirely blue, apical half black; 4-7 black with 
a narrow transverse basal blue ring; 8-10 blue, an inferior longitudinal stripe each side for the whole 
length of these segments, but much narrower in the basal two-thirds of 8. 
An immature male has the pale blue of the head replaced by orange-yellow, the black of the body generally 
by brown ; the mid-dorsal thoracic stripe is metallic-green, metepisternum bright yellow—the most con- 
spicuous area of the body,—the blue of thorax and abdomen represented by dull yellows and pale browns. 
Q. Differs from the male as follows :—Blue of the male replaced by pale brown or yellowish-brown in the 
dried condition, although with some hints of bluish; metepisternum bright yellow, as in the immature 
male; segment 2 with only an apical dark spot in the apical third ; basal three-fifths to two-thirds of 3 
pale, remainder black ; basal half of 4 pale tawny or ochre, a pair of small spots shortly behind the base 
and the apical half black, which black later covers the entire segment except for the transverse basal 
ring; 8 and 10 with a transverse basal black ring, which may be produced a little posteriorly on the 
dorsum, 9 with two paramedian dorsal black spots as long or nearly as long as the segment, 8-10 with 
an inferior black stripe each side, confluent at the bases of each with the other markings here described. 
Mesepisternal tubercles well developed. 
$ 2. Wings pale yellowish throughout ; stigma of the front pair g -8-1, 9 1 mm. long, surmounting more 
than one (91°7 °/, 5, 83'3 °/, 2 ), or one (8°3 °/, 5, 16°7 °/, 2 ) cell; of the hind wings g 1-1-2, 9 1:1 mm. 
long, surmounting more than one (91°7 °/, 3, 100 /o 2), or one (8:3 9/, 3+) cell. 
Antenodal cells on the front wings 5 (58:3 °/, 3, 33'3 °/o 2), 4+ (25 %/, 3, 50 %/, 9 ), or 4 (16-7 °9/, 3 2); 
on the hind wings 4 (75 °/, 5, 83:3 %/o Q) or 3+ (25 °/, 5, 16-7 9/, 9). 
Dimensions.—Abdomen, ¢ 31:5-84'5, Q 30-30°5; hind wing, ¢ 25-26:5, © 25-5-27 mm. 
