. The life history and bionomics of some North American ticks . has also been taken at Harlingen and atCorpus Christi, Tex. A single specimen which appears to be thisspecies was collected at Kerrville, Tex., but the species has not beenfound during subsequent collections in that vicinity. There seemsto be much doubt of the correctness of the record of this speciesfrom Arizona. The tick was found in abundance at Victoria andTampico, Mexico, but careful search for the species failed to revealits presence on the plateau in the central and northern parts of thatcountry. It has been recorded from G
. The life history and bionomics of some North American ticks . has also been taken at Harlingen and atCorpus Christi, Tex. A single specimen which appears to be thisspecies was collected at Kerrville, Tex., but the species has not beenfound during subsequent collections in that vicinity. There seemsto be much doubt of the correctness of the record of this speciesfrom Arizona. The tick was found in abundance at Victoria andTampico, Mexico, but careful search for the species failed to revealits presence on the plateau in the central and northern parts of thatcountry. It has been recorded from Guatemala, Panama, and CostaRica in Central America and from Cuba, Jamaica, Haiti, SantoDomingo, and Trinidad in the West Indies. It appears to be aserious pest in Cuba and Jamaica. THE TROPICAL HORSE TICK. 199 LIFE HISTORY. Observations on the biology of this species have been publishedby Hooker (1908) and by Newstead (1909). The egg (Table XCVI).—The first 3 ticks the opposition of whichwas recorded were collected from the ears of a horse; the next 7 were. Fig. 17. The tropical horse tick, Dermaeentor nitt us: Distribution in North America and West large dots show localities where the species has been collected in out investigation. The small doteindicate the probable range of the species in North America and the West Indies. picked from the ear of a mule; and the last 2 dropped from the earof a bo vino. The preoviposition period in the 12 ticks recorded varied from 8 to15 days. The minimum period occurred in the case of 2 females 200 LIFE HISTORY OF NORTH AMERICAN TICKS. which dropped from a host on July 27. These ticks were kept at amean temperature of ° F. The period of deposition ranged from15 to 37 days. The length of this period, as well as that of the preovi-position period, is materially affected by temperature, the high tem-peratures producing the shortest periods. The maximum number ofeggs deposited by 1 tick was 3,392 in the lot of 12 females obser
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