. The Cambridge natural history. Zoology. HYMENOPTERA shown, is possibly a Chalcid of the genus Monodontomerus, or may be Callimome lecleguaris. It is clear that, as we cannot ascertain what is inside a gall without opening it, and thereby killing the tenants, it is a most difficult matter to identify the larvae ; the only safe method is that of observation of the act of oviposition; this may be supplemented by rearing the iiies from galls, so as to ascertain what variety of flies are associated with each kind of gall. This last point has been well attended to; but the number of cases in which
. The Cambridge natural history. Zoology. HYMENOPTERA shown, is possibly a Chalcid of the genus Monodontomerus, or may be Callimome lecleguaris. It is clear that, as we cannot ascertain what is inside a gall without opening it, and thereby killing the tenants, it is a most difficult matter to identify the larvae ; the only safe method is that of observation of the act of oviposition; this may be supplemented by rearing the iiies from galls, so as to ascertain what variety of flies are associated with each kind of gall. This last point has been well attended to; but the number of cases in which oviposition of inquiline gall- flies in the galls formed by the Psenides has been ascertained by direct observation is still very small; they are, however, sufficient to show that the inquilines deposit their eggs only after the galls are Fig. 350.—Larvae in- habiting bedeguar gall at Cambridge. 1, Rhodiies roscte in cell; 2 and 3, larvae of inqui- lines ; 4, larva of a parasitic Hymeu- opteron. Bassett recorded the first case of the kind in connexion with a North American species, Oynips {Ceroptres) querctis-arbos Pitcli. He says: " On the first of June galls on Quercus ilicifolia had reached their full size, but were still tender, quite lilve the young shoots of which they formed part. Examining them on that day, I discovered on them two gall-flies, which I succeeded in taking. They were females, and the ovipositor of each was inserted into the gall so deeply that they could not readily free themselves, and they were removed by ; The great resemblance of the inquiline gall-fly to the fly that makes the gall both dwell in, has been several times noticed by Osten Sacken, who says " one of the most curious circumstances connected with the history of two North American blackberry galls is, that besides the BiastropJnis, which apparently is the genuine originator of the gall, they produce another gall-fly, no doubt an inquiline, belonging to the ge
Size: 2354px × 1061px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
