70 
Psyche 
[June 
Wings: membrane hyaline, veins slender, setae few, 
short. Fore wing: costa fuscous near base, otherwise 
pure white completely around wing. Costal veinlets dark- 
fuscous; Sc white, slightly fuscous basally; R pure white 
its whole length ; stigma white, costal area of stigma 
densely clothed with short dark setae. All other veins in 
basal area of wing white as far out as the cubital fork, 
thence becoming uniformly dark-fuscous. Hind wing: 
colored about as in fore wing, but with a slightly more 
extensive area of white veins. Venation as in Figure 1. 
Abdomen : short, slender, with terminal segments greatly 
enlarged. Pale yellow above, with narrow median fuscous 
stripe, most prominent on second tergite, where it forms 
an elongate diamond-shaped mark. Sternites brown-fuscous 
with large central area and posterior margins yellow. 
Genitalia as in Figures 3-5. Gonapophyses laterales bear 
on their posteroventral margins three rows of heavy 
bristles having the ends broadened and strongly reflexed. 
Length of antennae, 16 mm. ; fore wing, 14 mm. ; hind 
wing, 12.5 mm. ; expanse 28.7 mm. ; length of body, 7.5 mm. 
Holotype: Madera Canyon, Santa Rita Mts., Arizona, 
26 August, 1949, at light. P. A. Adams, collector. In 
the Museum of Comparative Zoology. 
Pimachrysa appears to represent one of a group of 
relict genera with extremely primitive venation. Carpen- 
ter (1935) has revised the fossil Chrysopidae of the 
Tertiary; the resemblance of these forms to Pimachrysa , 
and to Triplochrysa and Dictyochrysa, is striking. These 
three genera are, without doubt, the most primitive of 
known living chrysopids, at least as regards the wing 
venation. 
A characteristic common to these three genera, dif- 
ferentiating them from both the Tertiary forms and other 
Recent forms, is the position of the second medio-cubital 
cross-vein, basad of the furcation of MP. With the excep- 
tion of Hypochrysa, in all other genera known to the 
writer, if this furcation is present, the cross-vein con- 
nects MP 3 + 4 and CuA. Whether this basal position 
is a primitive or a specialized condition is debatable. 
