Annual report of the Board of Agriculture for the year ending June 30th (1883) (14581858777)

Identifier: annualreportofbo8188verm (find matches)
Title: Annual report ... of the Board of Agriculture for the year ending June 30th ..
Year: 1872 (1870s)
Authors: Vermont. State Board of Agriculture Vermont. State Board of Agriculture, Manufactures and Mining
Subjects: Agriculture
Publisher: Montpelier, The Board
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign



Text Appearing Before Image:
nto the cavity, or is pushed to oneside, where frequently it may be seen adhering to the leaf. The larvaat this time drops to the ground, into which it enters to undergo itstransformation. The larvae are translucent, viscid, nearly colorless. Those in thegalls are broad oval (see Plate vin, Figure 3) ; but those which haveleft them are more elongated, tapering almost equally towards eachend. On the lateral margin of each abdominal segment there are oneor more short spines, which are directed towards the caudal end ofthe body. And on the dorsal surface of each abdominal segment,near each lateral margin, there is a small tubular spiracle. There isa distinct head (see Plate vin, Figure 3a), which bears short butconspicuous antennas. The caudal end of the body (see Plate vin,Figure 3b) bears a pair of fleslry appendages, each of which is furn-ished with a pair of spines similar to those on the margin of the seg-ment, and a large number of triangular teeth. 270 VERMONT AGRICULTURAL REPORT.
Text Appearing After Image:
Plate VIII. INSECTS. 271 The larva spins something like a cocoon a short distance below thesurface of the ground. To this cocoon the particles of sand firmlyadhere, so that it can be distinguished from the soil only with diffi-culty. The pupa is yellowish-white, with large black eyes. Whenthe pupa is about to transform to an adult it emerges for about two-thirds of its length from the the cocoon. The pupa skin remainsfirmly attached in this position (see Plate viii, Figure 4.) The galls made by this insect have long been known. OstenSacken, from a study of the galls and the larva which he saw in them,proposed the name Cecidomyia ocellaris for the species, believing theinsect to be a member of the Cecidomyidw. But the fly which I havebred proves to belong to the genius Sciara, of the family Mycetophi-lidce. This result is quite interesting, for the species of Sciara areusually found among decaying leaves, in vegetable mould, in cow-dung, under the bark of dead trees, etc. One other spe