~ 
94 LIFE HISTORY OF NORTH AMERICAN TICKS. 
Nymphs which dropped June 8, 1908, and were kept at a mean 
temperature of 80° F. commenced molting on the fourteenth day 
after dropping. A total effective temperature of 486° F. accumu- 
lated during this period. When the mean temperature was 58.34° F. 
molting began on the eighty-ninth day after dropping. The longest 
period from dropping to molting which we have observed was 124 
days. The last three lots of ticks, the molting of which is recorded 
in the following table, were collected from wild hosts and were not 
all fully engorged. 
same. 
This may have tended to lengthen slightly the 
molting period of some of the individuals. 
The nymphal molting period of the two sexes is practically the 
Our observations indicate that a very large percentage of the 
engorged nymphs reach the adult stage even when dropping takes 
place in the winter. 
TaBLE XXVII.— Molting of engorged nymphs of Hemaphysalis leporis-palustris. 
Date Engorged ny.uphs molted—days following dropping. 
engorged : Nuin- 
nymphs Host. ber. | 
dropped. 13 | 14 | 15] 16 | 25) 26 27 | 29 30 | 48 49 | 53 | 58/84! 85 | 89 | 94 |96/ 97 |98 
BA es REAM Coit fey) Bot) Tea ale SRE hs 2h A | ae eee Cine | 
Nov. 4,07 | Rabbit_... 1 OM OF O"} SON 4080 0/0 0 0 PSO OO SO SOF OF OF Oate 
INOW .D07 822500). 5 7-0 1 Ot e Ow) OMe OF POs) Os0 19] 01.0 1.0) 0) 20) 0 | <0) Oona 
Apr.10,08 | Bovine_- 3 ON}? Of Os ONO ONL Oa ROMO) Oy 40.1105) 10) 120 Oi On OR ROM ine 
AD ToUn OSs | CORe ae 6/105) Oo COR On Sao IgS1 9/19) 0 OF) O30 10 15205) OO) On One 
Apr.12,08 |...do...... 2| 0] 0/0] ojo {13 fo | o}o|o/ol/ol/o/]o] of of Ololola 
June 6,08 |...do.....- 5 0 fta{i Slee 0} O1O|0|0/0/0\0/0/0] o| 0} ovavom 
| . | | 
‘ 28/482 larwidl 
Tune 7,08.|.-sdo. a -0 24 | 0 sooo} 0} 0/0/0/0 o}o/o}ojo} 0} 0} ojojolo 
June 8,08 |...do...... 14 {13198 49/14/0] 0/0)0]0/0);0/0/0]0] o| 0] ofojojo 
June 9,08 |...do...... 2/ 0] Oj1s] 1/0] 0/0/0)0/0]/0/0]0/0] 0] 0] of 0]o0}o 
Noy.10,08 | Quail..... FOO Or Oo 0]-0/0/0/0) 0/0919; 0) 0] 0} OJo/ojo 
Nov.25, 09 retell DH MOO VOl) ONT OR MONON TOON OMRON ORO On| a On in: O 507) 2aie2 
Dec. 29,09 haparral | ld 
Spay BHO, Dale 0}0) O}0/o)0,ofojo/o oj raf ehhahe| ojo 
Total! ke ree Ee f Pike P/N Diao ah Teen ae ia ey 
emu! | | Lal ae 
| 
Engorged nymphs r y ‘ 
molted—days fol- Number molted. P Soa teers crepe 
Date lowing dropping. + eb ae 
engorged |Num- 
nymphs eb. ber. | | | 
ropped. Meee Mini- | 4verage 
100 | 104/112) 113/124} @¢ Q Total. s daily 
| | | | mum. mum. mean 
ee Seas | al eee Ee (Cie 
27a SEE °F. 
Nov. 4,07 | Rabbit.... Le) ee O ON es O20) 20 1 0 Lo |uicidhasiodwosl dadianice tial Wes cee eee 
INOW UAW Sac Waasoen- OES OME Oe Os 20 0 1 1 eee eee Beroea cs . - 
Apr. 10,08 | Bovine Sa OF On Or Os s0 2 1 3 83.0 47.0 68. 84 
AMT A OSHEer Coe eee Gn On On Os SaOn nO 1 3 4 83.0 47.0 68. 98 
NFO Vey Ne nCKOye Seana OM ON OAL ON Oy > @ 1 it 2 83.0 47.0 70. 07 
JuMe "6; 08) | esd ose ae o- FORO} On| Onno 4 il 5 91.5 69.0 80. 52 
Tune OSs dOse se see 24 On nOn ie Om Gain) 8 15 23 91.5 69.0 80.57 
Junews 08) fe doOne ase 1A OR One 10" ON ex0 5 if 12 91.5 69.0 80.39 
June Oy 08) |2e donee e=- 2A OF) {On 0 Ont a0 Wel sachet 2 91.5 69.0 80. 55 
Nov.10,08 | Quail....-- ABN Oe Ot Osi Oa o 0 2 2 82.0 34.0 59.15 
Nov.25,02 | Rabbit Pi fal Viale eh ba! | ada 4 Oe AI be ll oe 24 83.0 17.9 58.34 
Dec. 29,09 | Chaparral GaletON | Os Os Os a0 3 2 i 87.0 17.0 61. 62 
cock. 
Total) sr vse: |< aggyel al oats lS ae 26| 33 841.0 noc wll kee i 
o = Male. Q= Female, 
