74 NEUROPTERA. 
K. Segments 8 and 9 pale, without black on dorsum (except on 9 in many 
specimens of A. vivida and A. extranea). 
L. Antenodal cells on the front wings four. 
M. Black mid-dorsal thoracic and humeral stripes and mesepisternal 
tubercles present. 
Mesostigmal lamina rounded externally . . . . . . . . 80. extranea. 
Mesostigmal lamina angulate externally . . - . . . . 8i1. vividaand vars. 
MM. Black mid-dorsal thoracic and humeral stripes reduced to lines 
or absent, mesepisternal tubercles absent . . . . . . . . 7%. sedula. 
LL. Antenodal cells on the front wings three, mid-dorsal thoracic stripe 
present, humeral stripe reduced to a line, no black marks on dorsum 
of segment 9, mesostigmal lamina rounded externally, mesepisternal 
tubercles absent. . ©. 2. 2. 2. 1... we ew 83. temmunda. 
KK. Segments 8 and 9 pale, 8 with a black stripe on each side of dorsum 
as long as or nearly as long as the segment, 9 with a similar stripe on 
the basal half. 
N. Antenodal cells five on the front wings, four on the hind, mesepi- 
sternal tubercles present . soe ee ew ew ww 21. harknessi. 
NN. Antenodal cells four on the front wings, three on the hind, mesepi- 
sternal tubercles absent. 
O. Mesostigmal lamina prolonged at the mesial end in a slender process. 
Mid-dorsal thoracic stripe wider than the carina . . . . [violacea, Hagen *.] 
Mid-dorsal thoracic stripe hardly wider than the carina, humeral 
stripeamereline. . . . . . - . « . 84, violacea, var. pallens. 
OO. Mesostigmal lamina rounded, with no slender prolongation ; 
mid-dorsal thoracic stripe wider than the carina, humeral stripe 
present. 
Black stripes on dorsum of segments 8 and 9 not reaching to 
the apices of the segments . Soe ee . 35. agrioides. 
Black stripes on dorsum of segments 8 and 9 reaching to the 
apices of the segments . . . . .. .., agrioides, var. nahuana. 
3. Postbasal black streaks. absent on segments 3-6, apical black reduced to a 
spot each side, 8-10 pale, unspotted. 
_ 25. fissa. —_—*) Separable by the form of the 
26. deami. | mesostigmal lamine: see 
27. tarascana. figg. 12-14, Tab. LV. 
1. Argia percellulata, sp. n. (Tab. 1V. figg. 5, 27.) 
3. Rear of the head black above, pale below. Pale antehumeral stripe one-half as wide as the black mid- 
dorsal. Humeral stripe deeply forked for its upper four-fifths to three-fourths, the humeral stripe proper 
a mere line (absent in teneral individuals) ;. the mesepimeral stripe before uniting with the humeral stripe 
proper is three-fourths to equally as wide as the pale antehumeral. Segment 2 dark brown (probably 
black in adult), with a mid-dorsal elliptical yellow spot on basal two-thirds continued as a line to apex, or 
a mid-dorsal line for the entire length of the segment, and each side with an ‘inferior yellow line; 3-7 
dark brown or black, with a transverse basal ring, a fine mid-dorsal line (absent on the more posterior 
segments), and a lateral streak, pale ; 8 blackish, with a transverse basal ring, a small mid-dorsal anteapical 
spot, and an inferior lateral streak, pale; 9 pale (blue ?), each side with an inferior black stripe as long 
as the segment. 
