THE ROCKY MOUNTAIN SPOTTED-FEVER TICK. 175 
TasBLE LXXX.— Molting of engorged nymphs of Dermacentor venustus. 
Engorged nymphs molted—days following dropping. 
an tect e 
gor SER a eS ee 
dropped y 11] 12 |13| 14 | 15 | 16)17| 18 |19] 20] 21 | 22) 23 | 24) 25) 26) 29) 30 | 31 
1908. 
May 18] Bovine.....-- 7 «ada | | Sass RE, Pe tS fara 
May 719-1: . 2. (CS a See 2 ASS eS | rN pa ees 
Mise: 28 iE es: ae 2-52 2 | Ee] | SA ON Na eee ee 
May. 21. 1°. oo: ee ee Ze, + Ra BRE Se a el aS 
ABE Gil owe: €6..55.(35: E7IEOUES. ee 
po a ee Se Pe TA CAC ctocel 
1909. 
Agr. 18/) Gaines pigs: .) Of. 12-1. - 2 ee ee 
Sept. 15 | Rabbit....... = FAL eg ORE RE a ee Os re \ 
Oct. 3 | Bovine......- | Lge) | Ie | (pel ee oes (ee een! ee 
1910. 
Mar. 10} Rabbit......-. 1 
Sey NESTE 5” ERE GR ie AG Cans SEA Spr Seeman a eS Se al ae Wee ee Set ee pe (eee 
Apr. 14!) Ground squir- 
en cremate me es te isch Re ae a ae 
May 161) Ground squir- \25 , 
5 nr, : - (seen Peele hae 
May 30] Bovine....... 3th eee alae hel pee sl ee fe Se es ee ee eel (oe 
UR on Soe ee te etait (etek ete Ghee Biciae tr boo Gi 
June 13! giecag | 16 
CULE 1) TEATS Ta FIP || ees ee Ve ees (ee ears ee eee Peers eee ames eee (eee eee) Mees - 5. 
July 261) Ground squir- \10 
Open ee ere ke le tae io earls pe te he ee 
CO gO a a eee eee 
Aug. 1] Rabbit.....-- 1) eee 1g 
Aug. 11 | Guinea pig...| 3)/...| 29]... 
Aug. 18 | Rabbit......- Meus idtsc: 
Doe...) Guines pig. |..| 7i..}--- { 38 
Aug. 19|..... ie a 12 29{S 33 
Aug. 30 |..... ee ee "7 ae ee {id 
Sept. 28 | Squirrel...... ee Same ee! SEES CORRS PE ee Bee 
ull 5 CaS RR A Se Sse SAR eg SN ae 
1 These nymphs were collected on native hosts in Montana when from one-half to fully engorged. 
