10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



Abdomen with ouly usual lateral pubescent patches at base, uot a woolly 

 ring 9 



5. Ventral spine abnormally long and slender, at least nine times as long as 



broad, longer than hind coxa 6 



Ventral spine not over five times as long as broad, shorter tliaii hind coxa_7 



6. Tergites all visible on dorsal margin. Ventral spine longer tlian hind tibia. 



From club-shaped twig swelling. Atlantic coast plain. Various red 



oaks quercus-phellos (O.sten Sacken). 



Tergites 2 and 3 only visible dorsally. Ventral spine shorter than hind 

 tibia but twice hind metatari-us. From bud gall. Q. niyrtifoUa, falcata. 



cryptica Weld. 



7. Sides of i)ronotum rugose. Mesoscutum microscopically coriaceous and 



somewhat shining. Q. iUcifuUa tuberosa Bassett. 



Sides of pronotuui coarsely and beautifully coriaceous and dull like the 

 mesoscutum 8 



8. Median groove absent. Head massive, semicircular when seen from above. 



Q. brevifolia meduUae (AshmeadK 



Median groove more than a mere notch on hind margin — at least longer 

 tlian broad. Head from above transverse, its length one-third width. 

 Q. catesbaei crypta (Ashraead). 



9. Abdomen of female with all tergites visible dorsally and ventral valves 



prominently protruding. Abdomen equal to or longer than head and 



thorax. Ovipositor long, ratio at least 4.4 times width of head 10 



Abdomen of female showing dorsally oidy tergites 2 and 3, tlie rest all 

 telescoped so abdomen is somewhat truncate and distinctly shorter than 

 head and thorax, ventral valves not prominent. Ovipositor short, ratio 

 uot over 2.6. Small species less than 1.9 mm. From flower galls 13 



10. Mesopleurae entirely coriaceou.s. Abdomen iniual to head and thorax. An- 



tennae usually 12-segmented, last over twice preceding. Ovipositor ratio 



4.5. From flower galls 11 



Mesopleurae partly striate. Abdomen longer than head and thorax. An- 

 tennae usually 13-segmented, last two subequal. Ovipositor ratio at 

 least 6 12 



11. Ventral valves protruding prominently backward at angle of 45° so abdomen 



is triangular. Female 1.8 mm. Male 1.7 mm. Q. nUjra. 



turnerii ( Ashmead ) . 

 Ventral valves turned up into nearly vertical position and nearly reaching 

 dorsal line. Female 2.0 mm. Male 1.6 nun. Q. itnbrie<ir!n. 



parva Weld. 



12. Ventral valves turned up into vertical position but not protruding or reach- 



ing dorsal line. Ovipositor ratio over 12. Scutellum with narrow trans- 

 verse furrow at base. Female 1.4-1.6 nun. Hard polythalamous leaf 

 parenchyma gall. Q. rubra modesta (Osten Sacken). 



Ventral valves prominently protruding and nearly reaching dorsal line. 

 Ovipositor ratio about 6. Scutellum with distinct pits. Average size of 

 female 2.7 mm. Male 2.0 mm. Woolly flower gall. Q. coccinia, mari- 

 landica, etc operator (Osten Sacken) (sexual). 



Closely related species. fJall unknown. Connecticut_obtusilobae (Bassett). 



13. Whole body brownish ; submarginal and both cross-veins brownish. An- 



tennae 13-14 segmented. Q. rubra, coccinea pulchra (Bas.sett). 



Whole body yellowish, all veins transparent. Antennae 12-13 segmeuted^l4 



