108 LIFE HISTORY OF NORTH AMERICAN TICKS. 
TABLE XXX V.— Molting of engorged nymphs of Rhipicephalus sanguineus. 
[¢=Male. 9=Female.] 
Engorged nymphs molted—days following dropping. 
Date engorged TET st | CLE Gc EEE ae ee 
nymphs dropped. ber | 
12 | 13 | 14] 15 | 16 | 47 ie 20 | 23 | 26 | 27 | 29 |53/56 
Sept. 22, 1907.......-. DOP. =r A (De et eee pall) Cc | ee Se S2 eee So fore, | {Mee Bee ee ee int Sl 
Oct. 27, 1907......-..|... do ys VGegaeee eee ee Se AE ace he reg heel Vee ea 
Nov. 11, 1907.-.......| Bovine... Rie aie een bee een pete ea Jans Pe heel es fi mee 
Nov: 12, 1907.........|_..dos...- ae ere I I Me FS ena eee ee el © 
Apr. 22, 19081........| Dog..... Gp Ege enee Pek ede ca Eg [ayia er se 1 6 a) 2 
July 17, 1908......... Bovine. a asig| Ne. Tolle eae i 
July 18, 1908.......-. ao. &: foe: 38 35 hala lah dec onleea elle aes 
July 19, 1908......... aoe 155} OURS ISG here Leclaaeal. sa be al Pale ale 
July 20, 1908......... Hie aes Bledel lled laces eer SE. Cea i flee 
July 21) 1908......... Reda 3/1919 el astacske foo aS 
Aug. 17, 19082....... Dog... 100 |--..|---{44 5138) 281 59|}19|----|---- ocak cael ae 
(33| 23| 63 33/43} 128 
AUIS LOSI rae wee Se Ob gee 100 “CA Ol Be Mallee 49] 39 Tete eae: Se (ere ---|-0= 
Nov. 29, 1909.........|...do..... Ct oe ee WE ela ame Re RS st ele Aye hy ae 
Total. ODI labs | ae Smeal ede lL eile Spelt, ete | cue a Sa 
Engorged nymphs molted— Number Temperature from 
days following dropping. molted. dr PE first 
Date engorged Num- | i 
nymphs dropped. Host. ber. : ; cs 
= = Ret Ge = 
2s leeo heater pli 3 =) = Os 
57 | 58 | 59 | 73 |122)125)127/129) Pt ls g g 2 @ 
Nh = ll hap 9 5A 
S 3) S SI A > 
SU SHE’ fel = |< 
un pi ie i; 
Sept. 22, 1907....- Dovse=- Dass se Seu eee erate eee 1} od [48.223 eee 
Oct 2%, 190%eeea- 3 |= =e Oss. Doe Sst eager Seer] ae | eee ates eerie | eres 2) 2 Sa ee 
Nov. 11, 1907..... Bovine Salahiehl ACH Sala eee Ce ee | i ee ees PS 
INOVAIEZS 190 Tes |e Osea Go VO ES sO MORSE alesse at ce A) 6S. noe a eee oe ee 
Apr. 22, 19081....; Dog....- 1S eee lioeee all eh ate fe ees eo ooees ecacder 11 | 86.0] 47.0] 70.39 
July 17, 1908...... Bovine.. Hi oes 3 he eo [ee Borel cea | erese 2 1} 3 | 95.05] 76.5.) (8456e 
MUly 18; 1908 eeeec| a dOenaas IO} See eect be er lees eee oe ee | Ree 6 4/10} 95.0] 76.5 | 84.70 
Daly 9, 1908sssec5 | -d0lee=- 157 |S sale sec Se aes eee eels ale 16 8| 14] 95.0] 76.5] 84.69 
July,20) 1908: 2-2-5 |69-G0:2=-- Oy ee Sees ge |ecsel| Sae eve Sen See 3 1] 4] 95.0] 76.5] 84.92 
Stily; 21; 1908 esse GO: ose ai | ee as Sst | (Ss PSE ees eve et oo Fame) 2| 2) 95.0] 77.0 | 85.42 
Aug. 17, 1908 2....| Dog.-.--- LOO) osc |B se onl sealer See eee) tet 40 | 67 | 96.0} 75.5] 83.90 
Aug. 18, 1908 8....]...do..... LOOK Fes see sue) | Secell aexel eyelet ve cell are) 33 | 53 | 9350} 75.5 | (Saeag 
Nov. 29, 1909. ...-|--- doko: GAs eS aa ee onal aoes OM [Prosser ee eee eee TZ) 9250°)} 205001) sasam 
Total 322 |. 67 OG! 19N | 2 55] cee | eee 
1 Collected at Brownsville, Tex. 
2 Collected at Brownsville, Tex.; 27 of these nymphs were parasitized. 
8 Collected at Corpus Christi, Tex.; 40 of these nymphs were parasitized. 
The adult (Table XXX VI).—Of 163 adults which were observed to 
molt from nymphs, 96, or 58.9 per cent, were females. The greatest 
adult longevity observed by us was between 204 and 214 days. This 
record was made on alot of 13 males and 15 females which molted from 
nymphs September 1, 1908, and were kept in a tube on moist sand in 
the laboratory. On March 24, 1909, or after 204 days, a male and a 
female were alive. These were both dead on April 3, 1909. Other 
specimens which became adult in early September were found to live 
nearly as long as the lot above referred to. Several lots of ticks 
