. Memoirs and proceedings of the Manchester Literary & Philosophical Society. d. 9 5. Length about 1*1 mm. turned over, being enclosed by the expanded dorsal length the hiemalis is about i*i mm. The dorsalsurface is somewhat roughened by the waxy secretiongiven off and is considerably arched to the median line,where some traces of segmentation are visible. Borner (7) gives a diagram illustrating the life cycleof Hamamelistes betnlinus^ Horv., in which the wingedsexuparae appear as the offspring of the first summergeneration of apterous 9 9 (aestivales I.) and makes hisaestivales I
. Memoirs and proceedings of the Manchester Literary & Philosophical Society. d. 9 5. Length about 1*1 mm. turned over, being enclosed by the expanded dorsal length the hiemalis is about i*i mm. The dorsalsurface is somewhat roughened by the waxy secretiongiven off and is considerably arched to the median line,where some traces of segmentation are visible. Borner (7) gives a diagram illustrating the life cycleof Hamamelistes betnlinus^ Horv., in which the wingedsexuparae appear as the offspring of the first summergeneration of apterous 9 9 (aestivales I.) and makes hisaestivales II. as a parallel generation to the sexuparae. Manchester Memoirs, Vol. lix. (1915), No. 9. 9 I have not yet had an opportunity of investigating thespring generations of our species (77. tullgreni), and itmay possibly have a slightly different life history to theclosely allied one with which Borner deals. But unlessthere is a third summer generation, to correspond withthe young larvae found in June last and the maturefemales taken at the end of August, it appears to me that. ^oA.^v^y Text-fig. 4.—Hamamelistes tullgreni. Hiemalis, x 48. With portion of margin further enlarged. the aestivales I, and the sexuparae must be the progeny ofthe hiemalis and therefore parallel races, as in analogouscases of Chermes. The larvae and mature ? s found byme were certainly not parallel to the winged generation,as, according to Borner, they should have been in H. betu-linus. I hope to be able to get further light on the subjectof the spring and summer generations during the courseof the year, as I have hiemales under observation.
Size: 1613px × 1549px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1888
