stands motionless over or next to the eggs for fifteen to 22 days 

 vmtil the larvae hatch, (Earlier, at unrecorded high stimraer room 

 temperatvires , we obtained hatching in eleven to fourteen days). 

 Larvae attach to a host after twelve to fifteen days (earliest 

 host offered), and feed from eight to L?. days, but mostly from 

 sixteen to 25 days. Afterwards, larvae may require from fovir 

 to thirteen days before molting to first instar nymphs, but they 

 usually do so after four to seven days. 



Nymphs imlt two or, uncommonly, three times before reaching 

 adulthood. In our laboratory, those nymphs that reach adulthood 

 after two molts have never fed in the nvmphal stage , even though 

 bats were frequently offered, TITien a third instar nymph, which 

 has not molted to an adult, feeds it does so for half an hour to 

 an hoior from seven to 26 days after the previous molt and becomes 

 an adult from twenty to 32 days after feeding. The duration of 

 each nymphal instar is seven to seventeen days for the first in- 

 star, with eleven to fourteen days the most common. The duration 

 of the second instar is longer, from sixteen to ^3 days, with 22 

 to 29 days average. The duration of the third stage, when it oc- 

 curs, is erratic and lasts from 27 to 58 days. No significant 

 data on sexual differentiation from the unusual third nymphs have 

 been obtained. 



Adults feed for thirty to 35 minutes beginning some five days 

 after molting. Further sttidies on the life cycle of progeny are 

 under way, 



A biting tick remains motionless during feeding. It often 

 stands the ftill length of its anterior legs away from the point 

 of insertion of mouthparts that are extended by a pendulous tube 

 from the basis capitiili. Once the hypostome is inserted, the 

 host's hajid or arm (or the bat) may be moved freely till the tick 

 is satiated without causing it to remove its mouthparts. When 

 blood is rapidly engorged a large drop of clear coxal fluid ap- 

 pears beneath the body, but none is emitted during slow feeding. 

 Repletion from the human hand or arm reqviires from 25 to 35 

 minutes but full engorgement from the membrane of a bat's wing 

 may require three or four hours. Individuals that feed slowly 

 become very lethargic and one may remove them, even though fully 

 fed, after seven to 2^ hours with the mouthparts still inserted 

 in the wing membrane. Itching at the site of the bite on man may 

 persist for several weeks, 



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