Kinsey: Gall Wasp Genus Cynips 
425 
(acc. Weld 1926). Fountaindale (acc. Weld 1926; also gall, Bebb in 
Gray Herb.). Charleston, Green Valley in Tazewell County, and Seneca 
(Kinsey coll.). 
Minnesota: Hastings Road (gall, Ruggles acc. Felt 1921). Min- 
neapolis (galls, J. S. Benner in Kinsey coll.). 
Iowa: Ames (Gillette in 111. Lab. and U.S. Nat. Mus.). “Keo- 
sauqua” (?) (gall, MacDonald in Gray Herb.). Corinth (gall, C. Bar- 
racks acc. Weld 1926). 
Kansas: Cedar Point and Holton (galls, acc. Weld 1926). 
Probably confined to a more northern range of the host, Q. macro- 
carpa, from Quebec to Minnesota and Kansas. Replaced on the extreme 
northern limits of the range of the host by variety scelesta. The more 
western records need re-determination; the published Colorado records 
apply to variety undulata. Figure 70. 
TYPES (of macrocarpae) . — Holotype and 6 paratype females and 
galls in the Philadelphia Academy. Paratype females and galls in the 
American Museum of Natural History and in the Kinsey collections; 
paratype galls in the U.S. National Museum. From Rockport, Ohio; 
Quercus macrocarpa; Bassett collection. Now designated as types for 
the new name macrescens. 
The present re-descriptions are based on all of this type material 
compared with Middle-Western material. The type insects have faded 
to a brighter rufo-piceous than the original description and fresh speci- 
mens show to be characteristic of the variety. 
This is the common, nearly spineless, Acraspis gall on the 
burr oak in the more northern Middle West, but not on the 
very northern rim of the range of Q. macrocarpa. It is un- 
fortunate that Bassett’s well-known name, macrocarpae , for 
this insect is already pre-occupied in Cynips (as indicated in 
the synonomy above), and that it is necessary to introduce 
the new name macrescens for this insect. 
Macrescens shows the considerable variation which is evi- 
dent in northern Middle- Western varieties of Cynips fulvicol- 
lis and C. pezomachoides. Toward the north macrescens aver- 
ages smaller and darker, finally giving way in north-central 
Michigan to the variety scelesta. In southern Indiana and 
Illinois, and thru parts of more northern Illinois macrescens 
averages larger and more robust and gives way to purer popu- 
lations of variety opima. These three insects are not differ- 
entiated by many characters, probably because of the great 
simplicity of structure of all the sub-apterous Cynipidae; but 
their distinction is important because of the light it throws on 
the origin of a species by the hybridization of more northern 
and more southern varieties which were brought together dur- 
ing the glacial invasions of the Pleistocene. Thruout the 
