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. 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 
same. 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 ; Num-|___ P 
nymphs | Hest. | per. l ] l 
dropped. 13 | 14 | 15] 16 | 25| 26 | 27| 29/30) 48} 49) 53 | 58 | 84) 85 | 89 | 94 | 96) 97/98 
Ke N | | vt) Bes | eee) (728) >, 
Nov. 4,07 | Rabbit__-. 1) 0} OF 0} OF 0} 0/0/0)/0)/0)18)0)/0)0) 0) 0) 0)0) 0)0 
Nov: 5,070} ....d0---. ..2 l O} O-f:04) 0.) 0.) 0190) 0 | OT SOs), 0 | 0,0 15 0 | OO OOo 
Apr.10,08 | Bovine... . 3 0/ 0/0] 0/0} O19!12g}0/0)/0)0)0;0) 0; 0;] 0,;0)0)0 
Apr tt.0on|2- 500s =e sc 6] 0} 0/0) 0 ]19} 0 1d/19]119;}0);0);0)/0/0; 0] 0; 0;/0);0);0 
“4d | 
Apr.12,08 |...do...... 2} 0] 0/0] ojo {igo }o}o ofojo/o/o] 0} 0} ojojojo 
| 
June 6,08 |...do...... 5| 0 restr \og/0] 0} 0/0]/0|0/0]/0)0;0/ 0} 0} ojojojo 
June 7,08 |...do...... 24 | o PS iesiosto| o|o/o/0/o)0]/o0/o0/0) o| oJ ojojojo 
¢ | 
June 8,08 |...do...... re (sesree 13}0} 0/0/0/0/0}0)0/0}0} o| o| ojofojo 
Q|2 
June 9,08 |...do..-... SONOS LON ONtOR POM OF Os On FON MON TOM) On Onl Or ianerire 
Nov.10,08 | Quail....- DF 20) | OL 80s) OC On ORONO ON FOR ON LOMO) Onl) (OF) SON Os OR One 
ayaa Rabbit_... DF he OV! PONRO! O20: 1 FO) 02) OF) 0" F090) FO FOE FON Ona 0) 0/2) 2 
Jee. 29,09 | Chaparral 1g)\\, | 
: ee 6] 0| 00] o/0| ojojojo 0} 0) 0/0 0 isHis {ag 0|0 
Mo tales. -Seee ee Ua Ss. | Mecteck| Sime |eeala elec aies-| Meets SFA ee eae | ORE ee peeess|. Sherali 
1 a SS a ee . wes Jegade nell leg a lee 
Engorged nymphs 2 
molted—days fol- Number molted. pan. rei ra ae 
Date lowing dropping. ; eLUEIErc 
engorged : Num-|_ = —_— 
nymphs Host. ber. | | } 
dropped. ; Mais Mini. | Average 
100 | 104 | 112 | 113/124) ¢ Q Total. nian shine warty 
°F. OR: °F. 
Nov. 4,07 | Rabbit.... Dip Ol | (Os 20s) Os iO il 0 MT Eee Os Heo Keene ae acoso 
Wows 5:07 jen.G0. 3.56. Leen On| COM eeON| 0 1 Oe eS ee ee eee mec = 
Apr.10,08 | Bovine.... Or OF OF 0") “OR 0 2 1 3 83.0 47.0 68.84 
ATA L 0832-100 o~ 2-5-5 Ga eT OF Oc Or ity 1 3 t+ 83.0 47.0 68.98 
Apr. 12,08 }..-do..-...- 22110] O72 On). 0) ea0 1 1 2 83.0 47.0 70.07 
June: 6;08").4do. . 22-3 Bil 0} 20") Os] 2018.0 4 1 5 91.5 69.0 80. 52 
June. 7;081)=- do... =. => 2441) 100) SO BOs CaO 8 15 23 91.5 69.0 80.57 
June 8,08 |...do.. Ds) (ON MON SON) One @ 5 7 12 91.5 69.0 80.39 
June 9,08 |...do......- 20 FOF) “Ohin OG 1D eee 2 91.5 69.0 80.55 
Nov.10,08 | Quail...... 210) Out Obs Oa0 0 2 2 82.0 34.0 59.15 
Nov.25,09 | Rabbit.... ry Ge eae te me ay mee a | a et el ec oc « a4 83.0 17.0 58.34 
Dec. 29,09 | Chaparral 6 tOF| One OO) 4G 3 2 5 87.0 17.0 61.62 
cock. . 
Motalltsse<. cece oe UA co) occ bac oc ace 26 33 Ban 6 ewes ce|teck s. Soe eee 
¢= Male. O=Female, 
