54 NORTH AMERICAN FEVER TICK AND OTHER SPECIES. 
molting nymph taken on a Paradoxurus by Forbes in the Malaysian — 
archipelago. Lahille reports it from Argentine Republic. During the 
past two years it has been collected in Texas by agents of the Bureau at 
eight different times from rabbits and ares. The species seems to be 
generally restricted to the genus Lepus, but two instances of other 
hosts having been recorded and these probably accidental. On the 
rabbit the ear seems a favorite place for attachment. As a more 
extensive collection of the tick is made it will undoubtedly be found 
to occur in a much greater territory than isnow known. A few notes 
on the life history of this species have been made by us. 
TaBLe XIII. ives of eee es: ee 
Number ofe eggs deposited— 
May | May | May | May | May | May | May May | May Mary | May May | June| June 
I 23. 2 I 27. | 29. 30. 31. 1 2-3. 
260 | 110 | 228| 146| 131| 98| 72| 63 | 4 0 0 0 0} (2) | 1,112 
0 0,| 2) 39 8 7 3 O} 0) @) |... beac learners as 57 
0| 47/ 70], 48| 43| 29 Aes hemes ©) Pi | Tiles 7| (a) | 326 
Oy 50) 0 0 TA, Eee Doe eo leeds 4 | 9 5 1| (a) 99 
a Dead. 
TaBLE XIV.—Period of incubation and longevity of Hxemaphysalis leporis-palustris. 
Eggs dence: | Hatching | Minimum Remarks 
ited | commenced. ition period. ; : 
May 20-23... --. | jiune20es- eee 231 | March 5, dead. 
May 24-29...... JUNE Zon saecee 39 | March 5, dead. 
September 2-5 | September 26. 24 | May 11, dead. 
Subfamiiy IXODINZ. 
Three genera of this subfamily, Ceratixodes, Ixodes, and Ambly- 
omma, are represented in the fauna of the United States. They may 
be readily distinguished. The Ixodes have long club-shaped palpi, 
the form of the third segment being typical of the genus (see Pl. III, 
fig.4). The male and female have only the first coxz provided with a 
spine of varying size; the anal groove surrounds the anus anteriorly, 
opening posteriorly; eyes are present. In Amblyomma the palpi are 
long but cylindrical; the male has a long spine on the first and fourth 
cox, while in the female only the first coxe have spines, the others 
possessing tubercles; the anal groove surrounds the anus posteriorly 
and opens anteriorly. Ceratixodes, with pointed palpi, occurs on sea 
birds. 
Genus IXODES. 
(The Castor Bean Ticks.) 
Previous to 1796 all ticks were placed under the Linnzan genus 
Acarus. In that year Latreille erected the genus Ixodes, giving J. 
ricinus as the type species. For many years following all ticks 
