1950] 
Banks — Western Chrysopidae (Neuroptera) 
51 
Pronotum pale, with sides parallel, but in front narrowed; no 
distinct marks ; meso- and metanotum dull, pale brownish ; legs 
wholly pale, hind femora unmarked. Abdomen pale, dull gray to 
brown above with the apical three segments pale yellowish, below 
with only the apical segment pale. 
Wings hyaline, with hyaline or whitish (perhaps greenish alive) 
venation, the base of the second cubital cell and the cross-vein below 
it in certain views dark; no sinuous costal cross-vein; the costal 
area, which, at broadest, is much more than one-half of radial area, 
has three long cells near base (fourth, fifth, and sixth) which are 
almost or fully as long as high and beyond are several cells longer 
than usual. The divisory cell very slender, narrowed at base, and 
ending beyond the cross-vein above, six cubitals beyond the divisory 
cell; two inner gradates and five outer, the inner much nearer to 
outer than to the radial sector. Three branches of radial sector 
reach to margin, tip of fore wing rounded, that of hind wing plainly 
acute; costal fringe fairly dense and of moderate length, hairs on 
veins rather few and quite long. Length of fore wing, 10.2 mm. ; 
width, 3.7 mm. 
One specimen from Ehrenberg, Yuma Co., Arizona, 11 July 1948, 
mesquite area (Nutting and Werner). 
Type: M. C. Z. no. 28347. 
This species is peculiar in the long costal cells, but not unique; 
this character is found in Chrysopa apache Bks., and in Chrysopa 
yuma, the small green species described in this paper. For them I 
make a new subgenus with Chrysopa apache the type. It is based 
on the character of having especially long cells at the widest part 
of the costal area, at least one of them being as long as high; the 
antennae beyond the second joint, tend to be darkened, and the inner 
gradates much reduced, sometimes none; the number of branches of 
radial sector to reach hind margin is reduced so that the wings tend 
to have the shape of Eremochrysa. The three species now known to 
belong to this subgenus Yumachrysa, are apache with venation al- 
most wholly dark, longitudinal as well as cross-veins, and the hind 
femora have a black band. The others, yuma and clarivena (de- 
scribed in this paper) have almost wholly pale venation; yuma with 
the radial area but little broader than the costal, and clarivena with 
the radial area much broader than the costal, elsewhere also broader. 
