90 C. p. GILLETTE. 



F. Antenna hardly attaining middle of abdomen incisiis n. sp. 



FF. Antenna about as long as the body. 



G. MesopleuriE and antennae black siinili!^ n. sp. 



GG. Mesopleurse and antennse rufous- • . • • diiricoria n. sp 



DD. Metathorax and pectus rufous fioigera; Ash. 



BB. Head, except vertex, yellowish ; abdomen black eriiiacei n. sp. 



BBB. Head, except mouth-parts and abdomen, black piiiK^tata n. sp. 



AA. Sides of second abdominal segment not punctured, or with a few punctures 

 near posterior margin only. 

 B. Mesonotum coarsely and densely transversely wrinkled. 



C. Third joint of the antenna hardly longer than the 4th-inen<lax Walsh. 

 CC. Third joint of antenna one and a half times the fourth. 

 D. Sides of collar and mesopleurte black. 



E. Legs yellow, or slightly infuscated batatoids Ash. 



EE. Legs, at least the hind pair and all the coxse, black. atripes n. sp- 



DD. Sides of collar and mesopleurse yellow iiie.'cicana n. sj). 



BB. Mesonotum polished and with a few long, transverse, feebly raised lines. 



CO 11 i terse Ash. 

 BBB. Mesonotum finely and evenly sculptured, but not distinctly transversely 

 wrinkled. 

 C. Abdomen as broad as long, second segment not long and pointed. 



D. Mesonotum opaque, rugoso-puuctate eaiiipauiila O. S. 



DD. Mesonotum microscopically rugose and modenitely shining. 



walsliii (albipes Walsh). 



CC. Second abdominal segment produced, pointed posteriorly, distinctly 



longer than broad Ia^vivellJ^i!<i O. S. 



Synergus oiieratus (Harr.). 



Cynips onerafus Harris, Treat. Ins- Mass. 1841, p. 398. 



Cynips oneratiis Harris, Treat. Ins. Inj. Veg.. second edition, 1852, p. 434. 



Cynips onerafus Fitch, Fifth Kept. Ins. N. Y., 1859. p. 810. 



Cynips oneraius Harris, Treat. Iiis. Inj. Veg., third edition. 1862, p 548. 



Synergiis onerafus Walsh, Proc. Ent. Soc. Phila. ii, 1S64. p. 498, No. 20. 



Synergiis onerafus O. S.. Proc- Ent. Soc. Phila. iv, 1865, p. 373, n. 1, J • 



Synergus onerafus Cresson, Syn. Am. Hymen. 1878, p. 180. 



f^ynergus onerafus De Dalla Torre, Cat. Hym. 1893, p. 112. 

 ''The gall-fly of the white oak varies in color. Sometimes it closely resem- 

 bles the gall-fly of our oak apple, differing from it only in size, and in wanting 

 the brownish spot and dark colored veins on tlie fore wings; and sometimes it is 

 of a dvill lirownish yellow color, with a brown spot on the back. It is tlii'ee- 

 twentieths of an inch long, and its wings expand three-tenths of an inch. It 

 is the JHplolepis, or more properly Cynips onerafus, of my ' Catalogue.' " 



The above (les('n})tioii being altogether insufficient to dir^tinguish 



this species, I will add the following : 



General color yellowish or rufous, with pectus, spot on vertex, another on jjro- 

 notum, more or less of the mesonotum and scuteilum, the metathorax, the first 

 abdominal segment and the dorsum of the second, the tips of the mandibles and 

 the hind tarsi black or blackish. Antennte 14-jointed, nearly as long as the body, 

 third joint but slightly longer than the fourth ; mesonotum coarsely ti'ausversely 



