. The life history and bionomics of some North American ticks . 3-26 Nov. 26-Dec. 16 Larva (Tables XLIX-LI).—The longevity of larvae which hatchedon July 14, 1908, was 95 days. This was the greatest longevityobserved by us. Engorgement took place on a bovine as soon as 4days, the greatest number dropping from the fifth to seventh a cold-blooded host (a tortoise) 10 days were required for en-gorgement. Ticks placed upon a bovine had all dropped on theninth day, whereas upon a tortoise the last dropped upon the six-teenth day. An important point is here brought out in the fact
. The life history and bionomics of some North American ticks . 3-26 Nov. 26-Dec. 16 Larva (Tables XLIX-LI).—The longevity of larvae which hatchedon July 14, 1908, was 95 days. This was the greatest longevityobserved by us. Engorgement took place on a bovine as soon as 4days, the greatest number dropping from the fifth to seventh a cold-blooded host (a tortoise) 10 days were required for en-gorgement. Ticks placed upon a bovine had all dropped on theninth day, whereas upon a tortoise the last dropped upon the six-teenth day. An important point is here brought out in the fact thatupon cold-blooded animals a much longer period is required for en-gorgement. Table L.—Engorgement of larvae of Amblyomma dissimile. Date larvae applied. Host. Larvae dropped engorged—days following applica-tion. Totalnumberdrop-ped. 4 5 6 7 8 9 10 11 12 14 15 16 2 Bovine — 1201 2908 4004 2803 800 300 060 030 012 0 0160 030 030 120 July 23 43 Aug. 16 Bui. 106, Bureau of Entomology, U. S. Dept. of Agriculti Plate The Iguana Tick, Amblyomma dissimile, and the Gulf Coast Tick. Amblyomma maculatum. Amblyomma dissimile: Fig. I.—Unengorged larva. Fig. 2.—Unengorged nymph (balsam mount).Fig. 3.—Male, dorsal view. Fig. 4.—Unengorged female, dorsal view. Fig. 5.—Fully en|female (alive). Amblyomma maculatum: Fig. 6.—Unengorged larva. Fig. 7.—Lnenjnymph (balsam mount). Fig. 8.—Male, dorsal view. Fig. 9.—Unengorged female, dorsal \ :< \\.Fig. 10.—Engorged female, dorsal view. (Original.) THE IGUANA TICK. 133 At a mean temperature of ° F. larvae which engorged upon atortoise molted as soon as the seventh day after dropping. How-ever, the greatest number molted on the eleventh day. At a meantemperature of about ° F. larvae engorged upon bovines requireda minimum of 10 days from dropping to molting, the greatest num-ber molting on the twelfth day. Thus it appears that larvae engorgedon warm-blooded and cold-bloo
Size: 1231px × 2031px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorhunterwd, bookcentury1900, bookdecade1910, bookyear1912
