NEUROPTERA. 373 
21 (a). Argia pipila, sp.n. (Tab. X. figg. 16, 16s, 18.) 
3d. Rear of the head black, a yellow stripe alongside the eye-margins. Frons, clypeus, and labrum pale 
blue. Pale (violet) antehumeral stripe equal in width to the black mid-dorsal thoracic stripe (wider in 
teneral examples). Black humeral stripe narrower in its upper than in its lower half, which latter is 
one-third as wide as the pale antehumeral. A short black line at the upper end only of the second 
lateral thoracic suture. Abdominal segment 2 dark blue, a superior and an inferior black stripe each 
side, the former as long as the segment and widened mesad shortly before the hind end; 3-7 black, 
with a narrow transverse basal blue ring which is prolonged backward as a mid-dorsal stripe, tapering 
posteriorly, on 3-6, reaching to three-fourths to four-fifths of the length of 3, two-thirds to three-fourths 
of 4, one-half to three-fifths of 5, one-third to one-half of 6; 8-10 blue, with an inferior black stripe 
each side for the whole length of 9 and 10 and for the posterior three-fourths of 8, 10 also with a narrow, 
transverse, basal black ring confluent with the inferior black stripe of each side. 
. Differs from the male as follows :—Pale colours replaced by a paler violaceous. Rear of the head pale, 
with some black markings around the occipital foramen. Pale autehumeral stripe in some wider 
than the black mid-dorsal. Blackish humeral stripe often separated into an upper humeral line and 
a lower mesepimeral stripe, or even line, that reaches only half-way up to the front wing-base. Pale 
mid-dorsal stripe on segments 5 and 6 longer, reaching to three-fourths’ length on each; 7 coloured like 
6 in some; 8 and 9 pale bluish, each side with a superior and an inferior dark stripe, the superior 
reaching the whole length or to three-fourths’ (on 8) or two-thirds’ (on 9) way from base to apex, 
the inferior occupying the whole length of both 8 and 9 or the middle two-fourths on 8, the anterior 
two-thirds on 9, or absent on 8 or on 9 but not on both; 10 entirely pale blue, or as in the male. 
No mesepisternal tubercles. Sides of the abdominal segments pale inferiorly in both sexes, but more 
widely so in the female. . . 
3 9 (15 g, 15 @ tabulated). Pterostigma of the front wings ¢ ‘83-94, 9 :9-1:09 mm. long, surmounting 
one (462 °/, 5, 662 °/, 9), more than one (40 °/, 3, 20 °/, 2), or less than one (134 °/, ¢ @) cell; of 
the hind wings ¢ ‘9--98, 2 -9-1:02 mm. long, surmounting more than one (734 °/, 3, 70 °/, @), one 
(262 °/, 3 9), or less than one (34 °/, 9) cell. 
Antenodal cells on the front wings 5 (934 °/, db, 90 /o 2), 4 (84 Jo d, 6% %/o 2), 44+ (84%, 2), or 5+ 
(34 °/, 3); on the hind wings 4 (934 °/, 3, 962 °/o 2), 4+ (34 %/o 5 Q), or 5 (34. 9/, S). 
Dimensions —Abdomen, $ 28°5-32°5, 2 26-30°5; hind wing, ¢ 19°5-23, 9 20-23°5 mm. 
Hab. Guatemata, Gualan [24 3,8 2 +1 pair], between Gualan and El Rancho 
[3 ¢], El Rancho [1 ¢ ], between Agua Caliente and Guatemala City [3 g ], Amatitlan 
(1 ¢], Escuintla [26 ¢, 10 2 ], Santa Maria [1 ¢ ], Santa Lucia [10 ¢ + 1 pair, 
Mazatenango [16 3,1 2 ] (Williamson, Deam, Hine, colls. Wilmsn., O. S. U.). 
The specific name proposed is that of a Guatemalan tribe of this region. 
24 (a). Argia tonto (p. 89, footnote). 
The Cuernavaca male differs from the type-material in having the mid-dorsal thoracic black a stripe ‘7 mm. 
wide, instead of merely a line on the carina; apical black on abdominal segment 6 prolonged forward on 
each side inferiorly as a line, almost to base; pale basal ring on 7 prolonged backward as a wide 
mid-dorsal stripe to four-fifths of the length of the segment; pterostigma surmounting only one cell on 
the left front wing. 
To the localities given, add :—Mexico, Cuernavaca (Tower, coll. P. P. C.: 1 3). 
It is remarkable that the first Mexican specimen of this species should be obtained 
at such a distance from the type-locality. The collector gives the elevation at which 
it was taken as 8000 feet. 
BIOL. CENTR.-AMER., Neuropt., July 1907. 8C 
