128 NEUROPTERA. 
For this abundant and interesting species it is remarkable (1) that the proportion of 
black to orange females should be so small, viz. 4: 108—all previous descriptions '~® 
refer to the orange form; (2) all of the few (6) females from California and Arizona 
possess the vulvar spine—of the 106 from Mexico it is present in but two; (3) in spite 
of the fewer postcubitals in the California and Arizona individuals, their wings are not 
invariably shorter than those from Mexican localities. 
(4. Ischnura cervula. 
Ischnura cervula, Selys, Bull. Acad. Belg. (2) xli. p. 262 (1876) *; Calvert, Proc. Acad. Sci. (2) iv. 
p. 497, t. 15. fig. 3 (apps. ¢) (1895) *. 
g. Hind margin of prothorax convex medially for a distance equal to one-half the width of the entire hind 
lobe; more elevated than in I. demorsa and without median notch ; less elevated than in I. perparva 
and with the sides curved, not straight. 
Q (black and orange). Abdominal segment 8 blue, often a blackish mark each side; 9 black on dorsum, sides 
blue which rises upward on to the dorsum near apex (this in correction of my previous very brief 
description *). 
Hab. Unrrep States, Seattle and Olympia, Washington (0. B. Johnson, T. Kincaid, 
coll. P. P. C.), California! 2, Tucson, Arizona (M.C.Z.: 1 @ ), Santa Fé, New Mexico ? ; 
Lower CaLirornia, Comondu 2, San Ignacio 2. 
Quite likely to be found on the mainland of Mexico. A female from Olympia has 
complete pale antehumeral stripes. | 
5. Ischnura demorsa. (Tab. V. fig. 35.) 
Agrion demorsum, Hagen, Syn. Neur. N. Am. p. 81 (1861) ’. 
Ischnura demorsa, Selys, Bull. Acad. Belg. (2) xli. p. 261 (1876) *. 
As the previous descriptions are based upon a single male, the following may be added :— 
g. Hagen! does not mention any black on the abdominal segments 8 and 9; only one, from Arizona, is so, 
although two others from that State and four from Acambaro have a very little black on 8 and none 
on 9; all others have a lateral black stripe each side at least at base ; a very short black stripe on each 
side of 9 at base exists only on 1 ¢ Santa Fé, 1 ¢ Arizona, 2 ¢ Durango. Although Hagen * describes 
the superior appendages as two-branched in almost the same words as he employs for his I. credulum, and 
Mr. Henshaw writes that he finds them two-branched in the type, I cannot see such a condition, but find 
each appendage to be unbranched, bent downward in its apical half, and generally as in I. perparva. 
Pterostigma of the front wings usually rounded on its posterior side, rarely straight; that of the hind 
wings usually much smaller. 
9 (black). Nasus black, with metallic-green reflections ; postocular spots circular, blue or green, not confluent 
with the pale colouring of the rear of the head; a small isolated pale spot on each side of the dorsum of 
the middle prothoracic lobe; black humeral stripe more than half as wide as the black mid-dorsal stripe, 
from which it is separated by a complete pale green antehumeral stripe which is somewhat less than half 
as wide asthe humeral; dorsum of segments 1-10 black; pterostigma luteous, rhomboidal, nearly equi- 
lateral, surmounting less than one cell. 
? (orange). Nasus black, with metallic-green reflection, narrowly bordered with orange along its free margin ; 
postocular spots orange, confluent with the same colour on the rear of the head; a small isolated pale 
spot on each side of the middle prothoracic lobe ; black humeral stripe reduced to a line with a consequent | 
widening of the orange antehumeral stripe, which becomes more than half as wide as the black mid- 
