Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . CECIDOMYID^. 379 cecidomyian larvae, with the division between the segments in-dicated by rows of minute spines. From the germ-balls (a,nearest the posterior end of the body) the embryo is graduallyformed (as at a in the eighth and ninth rings of the body),when they assume a cylindrical form like the eggs of the adultfly of this ftimily. These eggs may be compared with the. Fig. 294. Fig. ?!.->. Fig. 296. pseudova of the Aphis, and are develope
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . CECIDOMYID^. 379 cecidomyian larvae, with the division between the segments in-dicated by rows of minute spines. From the germ-balls (a,nearest the posterior end of the body) the embryo is graduallyformed (as at a in the eighth and ninth rings of the body),when they assume a cylindrical form like the eggs of the adultfly of this ftimily. These eggs may be compared with the. Fig. 294. Fig. ?!.->. Fig. 296. pseudova of the Aphis, and are developed from the twolarge fatty bodies (corpora adiposa) which are situated one oneach side of the body. These false eggs increase in num-ber and develop until the entire cavity of the mother larva be-comes distended with young worms like itself, :ind which arcfinally born and may be compared with the wingless broods ofPlant-lice.* ? Grimm thinks that the term i)seu(iova is objectionable, as in the , Ckironoimis the winter ova, as well as the summer, or false ova, develoiiwitlioiit i)revious fertilization by the male. 380 DIPTERA. Several species have been found in Europe under the barkof apple trees, etc. Loew states that the species on whichWagner made his observations is nearly alliedto the genus Heteropeza, but still more closelyto the genus Monodicrana, from the amber ofthe Tertiary formation on the shores of theBaltic. (Zoological Kecord, 1865.) Meinert de-scribes a similar species of worm and
Size: 1612px × 1550px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
