On dimorphism in the hymenopterous genus Cynips; with an appendix, containing hints for a new classification of Cynipidae and a list of Cynipidae, ... species, inhabiting the oak-galls of Illinois - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1864 edition. Excerpt: ...viewed laterally. longer than wide, the dorsal edge in a quadrant and after relaxing the specimen almost in a semicircle from the joints opening out dorsally: joint 2 moderately polished, horny and glabrous, the following joints of ft somewhat softer consistence and opaque, except where their polished basal portion has been exposed by the relaxation, but scarcely rugose under the lens. Legs reddish brown, hind tibia? and the tips of the intermediate ones and all the six tarsi, brown-black Wings not expanded, but evidently not abortive. Length 9.16 inch; % unknown. One 9 With regard to the subdivision of Cynlpidx into true Gall-flies ( Pwtiide.t) and Guest gall-flies (Inquilinx), so far as my limited experience goes, all the species belonging to A. I., "Radial area narrow, areolet opposite its base," are gall-makers, and all belonging to A. II.. "Radial area broad, short; areolet opposite its middle," are Guest gallflies. (See Proc. Eat. Soc. Phila. I, p. 48.) According to Hartig. some species belonging to A. I. are Guest gall-flies and some belonging to A. II. are gall-makers. (Ibid. p. 49.) It may be so; but it is possible that Hartig may have been deceived, as he was in all probability deceived about his agamous species. Until some good observer succeeds in obtaining two distinct species belonging to A. I. from the same gall, we may well hesitate to believe that any species of that group is inquilinous in its habits. May it not be possible that Hartig obtained two dimorphous forms of some true gall-fly from the same gall, and supposing them to be distinct species concluded that one of them must be an Inquiline? Again, because a particular observer has hitherto bred nothing but species belonging to A. II. from a particular...
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