little-known Insects fro New Mexico, 335 
greatly from yucce in its dense chalk-like secretion, wherein 
it closely resembles P. bahtw, Ehrhorn. It differs from bahia 
in its much longer and more slender antenne and the much 
shorter tarsal bristles. The antenne closely resemble those 
of yucce, but differ in the uniformly longer second joint and 
the shorter sixth, seventh, and eighth. Prof. J. D. Tinsley 
has kindly lent me his series of measurements of P. 1 yucce for 
comparison, He has examined that species from California 
and Mexico, as well as the var. Barbert from the West Indies. 
Tenthredinide. 
Euura Coopere, sp. n. 
?.—Length 5 millim. Clypeus with a broad rounded 
emargination ; ridges of ocellar area distinct; frontal crest 
low but distinct, the lateral portions somewhat more prominent 
than the middle ; antennz about as long as head and thorax, 
third and fourth joints equal, fifth a little shorter ; outer veins 
of discal cells in hind wings not interstitial ; stigma large, not 
greatly tapering to the point ; sheath of ovipositor rounded at 
apex. Black and reddish testaceous or honey-colour; an- 
tenne black at base, the apical three or four joints brown ; 
front, middle of vertex, and occiput black or nearly so; face 
below antenne, orbits very narrowly in front, very broadly 
behind, honey-colour ; thorax black, lateral lobes of prothorax 
and sometimes the anterior half of the pleura honey-colour ; 
wings dull hyaline, hairy, nervures and posterior half of 
stigma dark brown, basal half of stigma whitish; abdomen 
honey-colour, with the basal half dorsally black, the black 
extending further backwards in the middle than at the sides ; 
sheath black; cerci black at ends; legs honey-colour, the 
hind tarsi infuscated. 
Described from four specimens. 
Gall an oval abrupt lateral swelling on the twigs of Salva 
sp. (a species with very narrow leaves), about 10 millim. 
long and 7 broad, pale and roughened. 
Hab. Vicinity ot Las Vegas, N. M., flies emerging April 5 
and 9 (Mary Cooper). 
The gall is similar to that of Huura salicts-ovum, Walsh, 
and it had been assumed that it was the product of that 
insect. Now that Miss Cooper has bred the flies, however, 
they are manifestly different. 4. mewvicana, Cameron, from 
Northern Sonora, is similar in colour to £, salieis-ovum, and 
also evidently different from Z, Coopere. 
