8 LIFE HISTORY OF NORTH AMERICAN TICKS. 
Development of the Ixodide—Continued. 
Genus Dermacentor—Continued. Page. 
The Rocky Mountain spotted-fever tick, Dermacentor venustus Banks. 165 
D@SGIiplive,. . soos < 9s) -cd seems aot oe eR oe eee eee tee 165 
Host relationship. ....2.:.<: .. -tucctette eee ame nee eRee 166 
Geopraphical distribution... -.).o eee eee ee tet eeu e ee see ae 168 
Life BIShOry aes c cet islaee i Ses eee ee ee meee ee eee wad ae 
Die CV Cle... tics aeons Mae ee ee ae ee ee ee Mae ee ae 179 
Heonomic importance: 3.6 oss eee eee eee eee 22 cee 180 
Natural control: «2:52.22 2036s heew lee ee eee eee eee eee 180 
Antitictal comtrol: sis s2Se5 <4 ats cass oe eee eee eee 180 
The Pacific Coast tick, Dermacentor occidentalis Neumann............- 181 
DGSCTIDIV Oo apo asc be oe ee an cee Sie peete die ale ee eg ea 181 
Host relationships =. 2/102. + =~ +0 cide boeecia te Cee eee oS eee 181 
Geooraphical distribution... ss c5sss. lcs be eee eee eon nee 182 
dnrke nshorye so SS 4. cian koe es ee oad daca oe Ooi ieee cee 182 
sie evclessa2 3. sat ae Seve Bos ae kee os ee ea coe 189 
Heonomic. importance :; 2):4.... 22. seeeeaecus eee eee pee, 189 
Natural comtzol a: 20 ae dc. c.c cemaa allotted aero eee ieee tee 190 
Artificial:control .(<.2.5-0422g28 -sonsaew cee eee tee reas 190 
The American dog tick, Dermacentor variabilis (Say). ......---.------ 190 
DesCHPTIVGs ix beseech 2 ee ean Are 190 
Host relationship: :ccjnsan0 - See Bois RON oes Sega ae MARA tk 191 
Geographical distribuition:..<222 4... 22256 3. eh eee ae eee pee 191 
Ife history 22. 5052 Soja hae 2 eRe aoe ee eee) | 
DilferCy Cle. ick ceaseie sete Sik eos Sh nd ose ee ee eee 196 
ECOnomic Importance < ca... <i50.5=.552 ~ cosas See ee Se ee 197 
Natural controle. o..cenciss aizincobee as dae es eee eee 197 
oo Axiitieial controls 2 2125 2 Sata eisic ae eters in am cra sient tone ale a oe 197 
The tropical horse tick, Dermacentor nitens Neumann..........------ 197 
DGSCRUPTVG «1.224 o,. 4 De aR eee eee ere 197 
Host relationship ..7 o\.is2.0- cee do eee wt oot os epee eee ee ae 198 
Geopraphical distributionsi22.4;- <4. =. 2s oo2- se eee eee 198 
Lute DIStOLry «oso. ces cb0 oo ces >. Ree oo = ee eee ee 199 
DLO CYCLO = on Chewine xa sal: vate o> sie tees ale geet ae ie ae eae eee 203 
Biconomie Importance ...24 5. acme nia ie heer tale a eee 203 
Natural comttole (<b 2)<scce.- o 62 one wee onside = eee eee eee 204 
Artificial controWM- 2.06 55.12 6 sca ce ees oso e eet eeP Ree eee 204 
iblioptaphical references: =. . £2.27 ...de= see Soe 2. Se ee eee ae 205 
16a ¥o Veo, teers earns en, Pane ae a eae Pe PUR Py Pena Sony ee 215 
