13 
ond segment occupying nearly half of the whole surface; segments 3 to 
7 short, subequal. Entire body very free from pilosity, except meta- 
uotal fimbria, which is pronounced and white, and except hind cox* 
which have slight whitish pilosity on the outer side. Claw of stigmal 
club straight, issuing from tip of club and extending considerably 
beyond it, club itself abruptly truncate, triangular. Entire body, 
including legs, black, except pronotal spot, femoro-tibial knees and 
tarsi, which are dark honey-yellow. 
Described from two female specimens reared by Albert Koebele, from 
small galls occurring rarely upon a grass of the genus Agrostis, col- 
lected at Summit, Placer County, Cal., in September, 1885. The galls 
were distinct elliptical swellings about 7 to 10 mm. long and from 2 to 
3 mm. in greatest diameter, and occurred upon different parts of the 
stalk. 
Isosoma captivum n. sp. (fig. 3). 
Female. — Length, 3.4 mm.; expanse, 5.8 mm. Head and meson otum 
uniformly, finely, and closely rugulose, not shagreened; metanotum 
Fin. S.—Isosoina captivum Howard. 
more coarsely rugulose and with a narrow and shallow central longi- 
tudinal groove which widens slightly posteriorly; pronotal spot plain, 
moderately large; hind coxa; delicately punctate. Abdomen shiny, as 
long as thorax, oblong-ovoid ; the second segment occupying nearly 
one-third the whole surface; segments 1 to G subequal, the third a little 
shorter; funicle joints 2 to 5 subequal; club nearly as long as three 
preceding joints; joint 1 one-half longer than 2; pile sparse and short, 
more marked at metanotal fimbria and terminal joints of abdomen than 
elsewhere. Color uniform black, except for pronotal spot, tarsi, middle 
and hind femoro-tibial knees, front tibiae and apical third of front fem- 
ora, which are light honey-yellow. Stigmal club about as in preceding 
species, except that its tip is more rounded instead of squarely truncate. 
Male, — Length, 2.5 mm.; expanse, 5 mm. Punctation rather finer 
than with female; petiole as long as first abdominal joint, strongly 
