25 
Dorsum of thorax and abdomen marked with yellow. 
Orbits, scutellum, and lobes of thorax more or less yellow; robust 
species 25. dcsmodioides Walsh. 
Same, with yellow transverse bands on abdomen, and venter altogether 
yellow 26. sulphured n. sp. 
Males. 
Antenna? as long as or longer than the body of the insect. 
Claws very minutely divided 5. agilis Cr. 
Claws coarsely notched 7. nevadensis Cr. 
Antennae not often exceeding one- half the body in length. 
Black species. 
Orbits black, rarely slightly rufous posteriorly. 
Pronotum black ; stigma short, robust 22. calif ornica n. sp. 
Pronotum black; stigma elongate, narrow 13. lincaidi n. sp. 
Pronotum with pale margins. 
Lateral walls of ocellar basin rounded or subobsolete. 
Third and fourth joints of antenna' of equal length. 
Hind femora pale 9. resinicola n . sp. 
Hind femora more or less dark 2. parva Cr. 
Third j oint longest 27. rugulosa n. sp. 
Lateral walls of ocellar basin sharply defined 8. excavata n. sp. 
Orbits yellow; body black dorsally. 
Venter of abdomen, except centrally, black; vertex hairless, shining. 
14. pisum Walsh. 
Venter with vertex clothed with yellowish hairs. 25. dcsmodioides Walsh. 
Venter of abdomen altogether pale. 
Epimcra black. 
Outer angles of pronotum pale 17. pomum Walsh. 
Pronotum altogether pale 4. pallicomis Nort. 
Epimera pale. 
Body robust ; stigma pale 12. robusia n. sp. 
Body elongate; stigma brown. 
Claws very minutely cleft at extreme tip. 28. placenta Nort. 
Claws coarsely notched 29. pallifrons Cr. 
Resinous; vortex, mesonotum, metanotum, and basal abdominal segments cen- 
trally black , 26. sulphurea n. sp. 
Table of galls. 
Galls springing from lower side of leaf. 
Conical or pear shaped 30. pyriformis n. sp. 
Globular, attached minutely 14. pisum Walsh. 
Globular, broadly attached. 
Singly on either side of midrib 17. pomum Walsh. 
In rows on or near midrib , 31. monile n. sp. 
Galls bisecting leaf. 
Singly, or rarely more than two on leaf. 
Usually remote from petiole; averaging three-eighths inch long; on Salix 
longifolia 15. bruneri n. sp. 
Near or joining petiole; averaging one-half inch long. 
Approaching shape of seed of Desmodium : 
,On Salix calif ornica ? 22. calif ornica n. sp. 
On Salix humilis ? 25. dcsmodioides Walsh . 
On Salix sp 2. parva Cr. 
More robust, approaching globular 23. gracilis n. sp. 
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