126 NEUROPTERA. 
4 or. 2), Jamaica & 18, St. Thomas #4, Martinique (i. C.Z.: 43,1 bl. 2,2 or. 2), 
Barbados (M.C. Z.: 1 3). 
Intermediate individuals connect the variety credula with the typical L. ramburi }, 
In Mexico and the West Indies the variety appears to be more common than the type, 
which latter, however, extends farther north. No apparent difference exists in the 
venation or the structure of the two. I cannot see that the measurements given above 
furnish sufficient evidence for a belief in the existence of local races—much more 
extensive series must first be examined. (See also under J. denticollis, infra, p. 127.) 
[2. Ischnura damula, sp. n. 
3. Very similar to J. cervula, but differing as follows :—Dorsal process on segment 10 less elevated, about 
one-fourth as high as 10 itself, bifid in less than its apical half, its branches separating at more than 90°, 
short, obtusely rounded. Superior appendages viewed from above not quite half as long as 10, divergent, 
ending rather abruptly in a very short acute spine; viewed from behind, there is visible a slender, 
downwardly-directed, acute process which is slightly longer than the remainder of the appendage distal 
to the process. Inferior appendages half as long as segment 10, therefore longer than the superiors ; 
viewed in profile, curved upward at the tip, very similar to those of J. verticalis, but slightly stouter ; 
viewed from below, hardly bifid, the inner branch very short, the outer (which is the only one visible in 
profile) curved inward at tip which is thereby hook-like. Hind margin of prothorax showing three 
slight festoons at about the same horizontal level, the middle one produced upward slightly more than 
the other two. (The smallest male has the hind margin almost straight, slightly produced in the middle.) 
Front wings : 8-10 postcubitals (chiefly 9), nodal sector arising at fourth. Hind wings: 7-8 postcubitals 
(chiefly 8), nodal sector arising at third. 
Dimensions.—Abdomen 21-24; hind wing 14-16 mm. 
© unknown. 
Hab. Unitep States, Denver, Colorado (coll. Adams: 3 3), Zuni, New Mexico 
(Henshaw, M. C. Z.: 2 3). 
The specimens from Zuni were captured on July 7. 
This species has the colouring of J. cervula; its hind prothoracie margin, inferior 
appendages, and dorsal process on segment 10 are very similar to the same parts of 
I. verticalis; its superior appendages are intermediate in form between those of 
I. ramburi and I. cervula. The specific name is suggested by analogy with cervula.] 
8. Ischnura denticollis. 
Agrion denticolle, Burmeister, Handb. Ent. ii. p. 819 (1889)'; Hagen, Syn. Neur. N. Am. p. 81 
(1861) ?; Calvert, Trans. Am. Ent. Soc. xxv. p. 38, t. 1. fig. 13 (prothorax, 2) (1898) *. 
Nehalennia (?) denticollis, Selys, Bull. Acad. Belg. (2) xli. p. 1244, xlii. p. 990 (1876) *. 
Ischnura eastriata, Calvert, Proc. Calif. Acad. Sci. (2) iv. p. 493, t. 15. fig. 2 (apps. g) (1895) ° 
Ent. News, ix. p. 72 (1898) °. | 
3. In spite of special search, not one of the specimens before me shows a pale antehumeral stripe or spot. 
Q (black or homceochromatic, not hitherto described). Differs from the orange ? as follows:—Yellow or 
luteous replaced by blue; nasus, front of second antennal joint, and entire dorsum of prothorax black, 
with more or less metallic-green reflection. Postocular spots of the size of those of the ¢, consequently 
smaller than those of the orange 9, blue, not confluent with the pale colour of the rear.of the head. 
Antehumeral stripe narrow, blue, constricted near its upper end (1 2), or almost absent, its upper and 
