1950] 
Banks — Western Chrysopidae ( Neuroptera ) 
47 
male with almost entire front forming a large heartshaped concavity. 
Body and wings pale yellowish, female rather more green, a broad 
black stripe on cheek, scarcely interrupted; palpi lined with black; 
pronotum broadly reddish brown on each side; third antennal joint 
scarcely longer than second or fourth, not modified; second joint 
constricted below middle; vertex with the median raised area mar- 
gined on sides and front by a dark line. Basal joints of antennae 
hardly one-half their diameter apart, erect, and sides convex, in both 
sexes alike. The interantennal process is slender between antennae, 
but widened and forked in front, each arm with bristles at tip; below 
there is a great, heart-shaped concavity occupying almost entire 
dorsal surface of face, each upper corner reaching to the eyes; its 
surface and margin bears erect, short hairs, and below tip of inter- 
antennal process are two tufts of long, erect hairs ; pronotum 
narrowed in front, behind as broad as long. 
Wings about three and one-half times as long as broad, tip nearly 
in a point; venation open, but eighteen to twenty costals, and only 
nine or ten radial cross-veins, mostly dark. Medius to tip of the 
second cubital cell is dark, also the basal part of the radial sector; 
branches of radial sector dark on basal part; also dark are the gra- 
dates, cubital cross-veins, and branches of anal vein near wing base; 
marginal veins pale. In hind wings not so many veins dark. The 
costal fringe is moderately long, but much shorter than in M. 
emuncta ; hairs on cross-veins but few. Divisory cell ends at the 
cross-vein above. 
The costal cells are higher than long, except near the stigma; 
radial cells about as long as high ; the gradates in parallel rows, 
inner of three or four, outer of five, each widely separate from the 
next. Beyond the end of the medius but two and one-half forks be- 
fore wing-tip. Length of fore wings, 11.8 mm.; width, 3.7 mm. 
Male type from Pinecrest, Tuolumne Co., California, 10 July, 
1948. P. H. Arnaud, Jr., collector. 
A female taken at the same locality, but on 19 July a is apparently 
the same species. The head and a median stripe on the pronotum are 
whitish, elsewhere and wings green. Nine radial cross-veins as in 
male, and other venation similar; the costal fringe longer than the 
male, but six cubitals beyond the divisory cell; basal antennal joint 
as in male; of same size. 
Type: M. C. Z. no. 28350. 
