. The American entomologist. Entomology. VOL. 1. ST. LOUIS, MO., APRIL, 1869. NO. 8. Ck l^mtntaii ^ntflmolugbt. PliBLISIIKD MOXTIILY BY R. F. STXJX)LE-5r <Sc CO., 104 OLIVE STKEET, ST. LOUIS. EDITOKS : BEXJ. D. ' .'HAS. V. RILEY, 2130 Clark ' THE .I0INT-W0R5I. ' a«..v«.'i'i in,n!r!. Harris.) Its tlperalions upon small (irain. Ill certain years and in particular Slates the iroiis of wheat, of barley, or of rye are ob- served to be greatly injured by a minute mag- got, popularly known as the " ; . Tliis maggot is but little more than one-eijrlith of an inc
. The American entomologist. Entomology. VOL. 1. ST. LOUIS, MO., APRIL, 1869. NO. 8. Ck l^mtntaii ^ntflmolugbt. PliBLISIIKD MOXTIILY BY R. F. STXJX)LE-5r <Sc CO., 104 OLIVE STKEET, ST. LOUIS. EDITOKS : BEXJ. D. ' .'HAS. V. RILEY, 2130 Clark ' THE .I0INT-W0R5I. ' a«..v«.'i'i in,n!r!. Harris.) Its tlperalions upon small (irain. Ill certain years and in particular Slates the iroiis of wheat, of barley, or of rye are ob- served to be greatly injured by a minute mag- got, popularly known as the " ; . Tliis maggot is but little more than one-eijrlith of an inch long, and of a pale yellow color with • the exception of the jaw-s, which are dark \ brown. It inhabits a little coll, whieli is situa- ted in the internal substance of the .stem of .. tlie afiected plant, usually a short distance above 1 ;the first or second knot from the root, the outer ..surface of the stem being elevated in a corres- < , londing elongate blister-like swelling; and ( vhen, as generally the case, from three to ten of these cells lie close together in the same spot, the whole forms a woody enlargement ' yioucy-combed by cells, aud is in reality a many- j jcelled or " polythalamous'" gall, analogous in i its nature aud structure to those which we hav(; ' described in a preceding article. (No. 6 of the ^.Vmek. Estom.) In Figure 113, «, will be seen \\ sketch of one of these galls, the little pin- -holes being the oritices through which the tlies n-oduced from the joint-worms have escaped. Vt first sight, these knotty swellings of the ; cm are apP to elude observation, because, ? I eing almost always situated just above the joint or knot on that stem—whence comes the popular name "Joint-worms'"—they ai-e en- [ wrapped and hidden by the sheath of the blade; liiit on stripping ofi" the shoath, as is supposed :. Colors—(o) strinv-y<'ll.«v: (//) lilark to have been done in the engraving, they be- come at once very cons
Size: 1859px × 1345px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectentomology, bookyear1
