. The life history and bionomics of some North American ticks . d between 70 and 80 daysup to the time it was put on a host(June 8). One nymph whichmolted March 11, 1909, was aliveand able to attach to a host whenapplied on May 31, 1909, a period of 81 days after molting. Otherlots which molted in March, 1909, and were kept on sand died infrom 27 to 56 days. It should be stated that all of these nymphswere collected as larvae late in the fall of 1908 and did not moltuntil March. Probably specimens dropping during warm weatherso that they would molt to nymphs in a short time would live for amuc
. The life history and bionomics of some North American ticks . d between 70 and 80 daysup to the time it was put on a host(June 8). One nymph whichmolted March 11, 1909, was aliveand able to attach to a host whenapplied on May 31, 1909, a period of 81 days after molting. Otherlots which molted in March, 1909, and were kept on sand died infrom 27 to 56 days. It should be stated that all of these nymphswere collected as larvae late in the fall of 1908 and did not moltuntil March. Probably specimens dropping during warm weatherso that they would molt to nymphs in a short time would live for amuch longer period. Nymphs were found to attach readily to a bovine, but some troublewas experienced on account of scabs forming around the mouth-parts and causing the ticks to drop before becoming fully were found to change their point of attachment severaltimes before imbibing much blood. The shortest period in whichengorgement took place .upon a bovine was S days, the greaternumber dropping on the ninth and tenth days, the last to leave the. —The gopher-torloise tick: Vesica bilobaextended between the scutum and capitulumin position to receive an egg from the oviposi-tor. Greatly enlarged. (Original.) 128 LIFE HISTOBY OF NOKTH AMERICAN TICKS. host dropping on the eleventh day. Upon a cold-blooded host theperiod of engorgement will undoubtedly be found to be much longer,as was found to be the case with Ambylomma dissimile. Attempts toget nymphs to attach to a horned toad were unsuccessful. Table XLVI.—Engorgement of nymphs of Amblyomma tuberculatum. Date nymphs applied. Host. Nymphs dropped engorged—days followingapplication. 10 11 Totalnumberdrop-ped. Apr. 14, 15, 20, 7, 11,1909. Bovine ...do ...do ...do ...do At a mean temperature of 81° F. nymphs which dropped the lastof May commenced to molt in 29 days, a total effective temperatureof 1,104° F. having been required. The molting period of nymphswhich become
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