THE ROCKY MOUNTAIN SPOTTED-FEVER TICK. 
175 
TaBLE LXXX.— Molting of engorged nymphs of Dermacentor venustus. 
Guinea pig... 
Ground squir- 
Fox squirrel. . 
Ground squir- 
Bovine 
Guinea pig... 
Ground squir- 
rel 
Woodchuck. . 
Total... 
15 
Engorged nymphs molted—days following dropping. 
14 | 15] 16 |17| 18 |19] 20 | 21 
Pea PAWNS 2. || 2. 
el igl{ 73|h..|--. 
me howd ce 19] 14]... 
ahaa es) ts i? 
ssa] age LL 
(is]Feleatal | 
Eel ece lista Ne 
5 fe | (aed beet eee eee - {ag |l2a 
2 EE Se = eee eet Ue Me alee aes 
ee | te eg ai PRE al EW { 
salle lee aloes 1g 
- 59119 
PM el ee ee Pee 19}{93]}29 
pelea cae c|e-le epeleesy cael 
El Sccelacecleraleceee PA esol aoe 
a aera 
\ Re ef ead ea (aimee (al (a 
ag}... PO leet tole 
igs re) ae abe al eae 
Sl ch i i i i aa 
22) 23 | 24) 25) 26| 29} 30 | 31 
Ret cL OWON Ashes ieee 
2 
a ae 
\ pes & 19|.. 
49]....|19].. 
1 These nymphs were collected on native hosts in Montana when from one-half to fully engorged. 
