NEONEURA 283 
Penneraietae Gad tf 865 MUO. an oe OE Telebasis, p. 305 
Wateral eeqaea—o i). &. 1a ae oi tA Enallagma, p. 313 
BetiauetalseineOse.. US aU Te SP ik) CN, or Da ees 9. 
Pateranseune 4 -Orc. sre See? OU & eM) Ss, 12. 
Saris tiperine toa slender POMt. ac. .lcis oe, oc a eee ple ieee 10. 
Gills rather bluntly pointed......... SE eNES Seach Pek) Gal 4g eo a |B 
0, Gength without gills:J8 mm... ...- 02s. .5 Teleallagma, p. 309 
Length without gills 11-13 mm............... Ischnura, p. 342 
flip of gills eobtusely-angled'0/ 2. ee. Coenagrion, p. 310 
Lip ofpillsiroundediery . .e8 eee, Lk Hesperagrion, p. 303 
12 No lateral spines on terminal abdominal segments............. 
ee aS ee, wines FOE? Eb RET Os Anomalagrion, p. 357 
With lateral spines on terminal abdominal segments......... 13. 
i. Gills tapering to's, slender poimt...4... 220.5050 gos es eee 14. 
Gills ending in an acute angle............... Enallagma, p. 313 
14 Side of abdomen fringed with long hairs...... Zoniagrion, p. 342 
Sides of abdomen not fringed with long hairs... Ischnura, p. 342 
61. NEonrEuRA Selys 
These are slender blackish damselflies rather strikingly marked with 
reddish yellow, the amount of blackening increasing with age. They 
will be instantly recognized by the brevity of the branches of the 
cubital veins, Cu, being but 3 cells long and Cu a rudiment. 
The nymph is unknown. These are tropical American damselflies 
of which the following species enter our borders. 
273. Neoneura aaroni Calvert 
Calv. ’03, p. 189: Mtk. Cat. p. 72: Wmsn. ’14, p. 446: Kndy. ’17, p. 289. 
Length 29 mm. Expanse 36 mm. Tex. 
This single member of a large tropical genus has been taken as yet only in 
southern Texas. Face pale with blackish dots on the postclypeus and labrum. 
Top of head brown becoming red with age. Front of thorax with a pair of narrow 
blackish stripes bordering the middorsal carina, narrow and interrupted in 
younger specimens; a broad blackish area covering the humeral region that 
varies with age from a shadowy line to a broad, dark band. Legs yellowish with 
black lines on femora and tibiae, the blackish portion becoming pruinose with 
age. Abdomen blackish above, yellowish beneath with lateral basal, narrow 
rings at joinings of segments 3-6. 8 and 9 obscure. 
Williamson (’14, p. 446) writes of it as follows: ‘‘a small lot of drift 
debris on one side of a relatively deep pool in a small stream on the 
