ARGIA. 91 
a superior black stripe, widened at its hinder end, which does not reach the apex, or more frequently 
only the hinder end of this stripe is present as an anteapical spot; 3-6 blue, each side with a black spot 
in the apical sixth to fourth, meeting on the mid-dorsal line on 3- or 4-6; 7 black, with a transverse, 
basal, blue ring, prolonged on the mid-dorsum from one-half to three-fourths of the length of the segment ; 
8 and 9 blue, unmarked. 
@. Differs from the male as follows :—Pale brown often replacing the blue of the male. Mid-dorsal thoracic 
and humeral stripes reduced to mere lines, the latter uot forked ; segment 7 coloured like 7 or 6 of the 
male. 
3 @. Pterostigma of the front wings °8-9 mm. long, surmounting more than one cell (83°3 °/, 3, 95 °/, 2), 
less than one cell (10°/, 5,5 /o 9), or one cell (6°6°/, 5); of the hind wings 1 mm. long, surmounting 
more than one cell (93:3 °/, 3, 95 °/o @ ), less than one (33 ol, 355% 2), or one (3'°3 °/, 3). 
Antenodal cells on the front wings 4 (80 9/, d, 95 %/o 2), 5 (33 %/, 5, 5 %, 2), 44+ (66 °ln 3 )s 
3 (66 °/, S$), or 5+ (33 %/o 5); on the hind wings 3 (766 °/, 3, 95 %/, 9), 4 (20 %, 3), or 
B+ (3:3 °/, 3,5 7/5 2). 
Dimensions.— Abdomen, ¢ 28-30°:5, 9 255-265; hind wing, ¢ 22-24, 9 22 mm. 
Hab. Mexico (U. S. VN. M.: 2 3), Acambaro in Guanajuato (Rhoads: 9 ¢, 10 2), 
Cuernavaca (Barrett, coll. Adams: 2 ¢), Matamoros Izucar in Puebla (Barrett, coll. 
P. P. C.: 1 6), Rincon in Guerrero (H. H. Smith: 1 ¢ ). 
Specimens were collected in March, June, and October in different localities. ‘The- 
specific name refers to the “ Tarascos,” an Indian tribe of Guerrero. 
28. Argia variabilis, (Tab. IV. figg. 6 (2), 53, 54 (2), 548 (2).) 
Argia variabilis, Selys, Bull. Acad. Belg. (2) xx. p. 406 (1865) (3d only) *. 
g. Rear of head pale above, with black below and around the occipital foramen. Pale antehumeral stripe 
very wide, as the black mid-dorsal stripe is hardly wider than the carina. Humeral stripe forked above, 
at its middle one-third to one-fourth as wide as the pale antehumeral. Segment 2 blue, each side with 
a superior black stripe, widened at its hinder end, which docs not reach the apex of the segment (except 
inferiorly, where it unites with a shorter black streak) nor unite with its fellow of the opposite side; this 
superior stripe may be broken into a basal stripe and an anteapical spot separate from the inferior streak (as 
in the type in the M. C. Z.); 3-9 blue on dorsum, each side with an inferior black stripe for the entire 
length of each segment, only united with its fellow of the opposite side by a transverse, apical, black line 
on 3-6; 10 black. 
Q. Differs from the wale as follows :—Black mid-dorsal thoracic stripe wider, equal to either pale ante- 
humeral. Humeral stripe half as wide as the pale antehumeral. Segment 2 blue, each side with a 
superior and an inferior dark steel-blue stripe as long as the segment ; each superior stripe united with 
its fellow of the opposite side in the apical half and with the inferior stripe of its own side by an 
anteapical “ bridge”; 3-4 as in the male, but with the black stripes wider, so that black predominates, 
and is united on the dorsal apical fourth to two-fifths ; 5-7 black, with a narrow, transverse, basal, blue 
ring; 8 as in the male; 9 black, the apical dorsal half blue or with only a pair of apical, dorsal, blue spots. 
3 Q. Pterostigma -7-8 mm. long, on the front wings surmounting one cell (75 °/, 3, 50 /, 2) or more than 
one cell (25 °/p 5, 50 °%/o 2) on the hind wings surmounting one cell (75 °/, ¢, 50 °/, 2) or more 
than one cell (25 °/, 5, 50 / 2). 
Antenodal cells on the front wings 4 (87:5 %/o 5,75 Jo 2), 4+ (25 °%/o 2), or 3+ (125 %/p 5); on the 
hind wings 3 (100 °/, d 2). 
Dimensions.—Abdomen, ¢ 26-29, 2 26; hind wing, ¢ 21, 2 22°5 mm. 
Hab. Mexico, Vera Cruz (Sallé, M.C.Z.: 13); GuateMaLa, Zapote (Champion : 
1g); Costa Rica, Caché (togers: 1¢ ), Cafias Gordas, 1200 metres (coll. C. C. Adams: 
14,2 2).. 
n2 
