82 THOMAS SAY FOUNDATION 
6. Abdominal tergites with basal half yellow and caudal half 
dark (even in the darkest colored nymphs the last ab- 
dominal tergite has a yellow basal spot with the caudal 
half black)i-7 Bastern so. on = oe ee lycorias (p. 87) 
Abdominal tergites not distinctly banded with yellow and 
dark; and never with the hind margin of the abdominal 
tergite blackish 2 -...7 000.0040 se ee rr Hl 
7. Eastern; abdomen uniformly dark brown or blackish; femora 
with a longitudinal dark band on the upper surface ..... 
ae UM TR Ete SR ond Vote iid V5 abnormes (p. 82) 
Western; mostly yellowish ...277..3). 2.2.2 7.0 7 8 
8. A yellow spot over the ocellar triangle; head and thorax very 
strikingly patternede. ts san ere californica (p. 85) 
Ocellar triangle dark; head and thorax not strikingly pat- 
TEIN eee eee ae ee ee ee theodora (p. 90) 
Acroneuria abnormis Newman 
(Plate 5, figs. 66-70; plate 31, fig. 221.) 
Length of body up to 29 mm.; antennae up to 16 mm.; cerci 
up to 22 mm. 
The nymphs of this species normally are dark brown to black- 
ish in color, with lighter markings on the head, pro-, meso-, and 
metanotum, but with the abdomen usually uniformly brown, and 
with the last abdominal segment dark brown or blackish; the 
cerci are usually as long as, or slightly longer than, the body 
and possess long hairs on the inside, especially near the base. 
The legs bear thick fringes of very long hairs. 
Head slightly wider than pronotum, dark brown to blackish; 
occiput yellow; a yellow spot outside of hind ocelli; a yellow 
M-line, which in some specimens is more interrupted; clypeus 
yellow; labrum dark brown; hind ocelli about half again as close 
to each other as to the eyes; area behind eyes with short spines 
on the caudo-lateral angles; surface smooth; antennae with about 
ninety segments. 
Pronotum a little less than twice as wide as long; front margin 
broadly convex; hind margin nearly straight; sides rounded; 
angles broadly rounded; surface brown to blackish, with yellow 
markings, as indicated in Plate 31, fig. 221. Lateral margins also 
lighter; marginal groove extends completely around pronotum, 
but is narrower and deeper on the anterior and posterior margins 
than on the sides; meso- and metanotum dark brown, with yellow 
markings. 
