122 NEUROPTERA. 
California 3; Las Vegas and San Gerénimo, New Mexico (A. Garlick, P. P. C. 
det. 1899). 
This species will probably be found in elevated localities in Mexico. Individuals 
from Dakota westward are usually more robust, more hairy, and have the metasternal 
tubercle more developed. If they can be differentiated as a variety, the name 
abbreviatum }3 is available. I have elsewhere 12 shown why, contrary to Mr. Kirby’s 
Catalogue, the name saucium is to be employed for this species instead of discolor. | 
ISCHNURA. 
Ischnura, Charpentier, Lib. Eur. p. 20 (1840)*; Selys, Bull. Acad. Belg. (2) xli. p. 259 (1876) ”; 
Williamson, 24th Rep. Geol. Indiana, p. 277 (1900) *. 
Micronympha, Kirby, Cat. Odon. p. 140 (1890) *. 
Ischnosoma, Wallengren, Ent. Tidsk. xv. p. 270 (1894) *. 
The name here employed for this cosmopolitan genus is in accordance with the 
views expressed by Mr. Williamson °. 
A remarkable peculiarity of Ischnura is the existence, in most species, of two or 
three differently coloured females—one similar, the other one or two dissimilar to the 
male of the same insect. 
Key to the Species known (or likely) to occur in Mexico and Central America. 
Males. 
1. Inferior appendages prolonged on the outer side into a slender process 
which is usually acute at tip and curved inward. 
a. Superior appendages bifid or subbifid, inner branch longer. 
b. Pale green antehumeral stripe complete; abdominal segment 8 
blue. . . . we ee ee we we we we 1 ramburi. 
c. Abd. seg. 9 black on 1 dorsum: . oe 6 ew we eh 6ramburi type. 
cc. Abd. seg. 9 blue, with some black at apex. . . ~ . . « ramburi, var. credula. 
bb. Pale green antehumeral stripe represented by two small spots only, 
one superior, the other inferior; abd. seg. 8 and 9 blue, a lateral 
black stripeoneach . ... . woe . . . [2 damula.] 
aa. Superior appendages not bifid, bent downward i in apical half; no pale 
antehumeral spot or stripe; abd. seg. 8 and 9 blue, a lateral black 
stripe on each from base to apex, connected on 8 by a basal black 
ring. . . . . . rn . . 9&8. denticollis. 
2, Inferior appendages truncated and slightly excised at tip, which is curved 
upward; superiors very short, not bifid, but with a long, slender, inner, 
downwardly-directed process; two small pale spots, representing the 
upper and lower ends respectively of the antehumeral stripe ; abd. seg. . 
8 and 9 blue, a lateral black stripe on each . . . . . . . « « [4 cervula.] 
