114 
LIFE HISTORY OF NORTH AMERICAN TICKS. 
TasLe XXXVII.—Oviposition of Margaropus annulatus engorged on bovine. 
Date Number of eggs deposited—days following dropping. 
engorged . 
ASR Bue 
dropped. 2 3 4 5 6 7 8 9 10 11 
1908. 
Aug. 3 | 12 by 7.5 by 6 mm.. 0 0} 481) 676| 754} 535) 384] 326] 194] 105 53 
Aug. 4 | ld by 9 by 6 mm.......2-2 0 21 596 | 857) 711 708 | 576] 443 166 | 264] 112 
Do. 13 by 7.5 by 6.0 Mm... . 5. 0 0} 297| 560} 457) 514] 511 442 | 372} 241 141 
Doss) 12:5iby «by pmm.--.----- 0 0} 494] 511 | 320} 500] 381] 272] 159 36 0 
Aue. 65) 12:5:by 8 by15.5 mms... 0 86 | 386 | 338} 427] 393] 257 139 57 12 10 
Do...| 13 by 8 by 5.5 mm... 0} 280] 420] 335 | 493] 663] 540] 330] 154 96 32 
Aug. 7 | 13.9 by 5 by 5mm 35 | 314] 431 425 771 658 | 576} 272 | 222 76 43 
Aue. 6/13 by'8 by 6mm. ....--..- 0 0} 402| 481] 612) 356] 272} 580) 228] 128 17 
Aug. 8 | 13.5 by 85 by 6mm....... 0| 177| 441] 602] 729| 978| 491 | 455} 245] 150 61 
Do 12.5\by 8 by, debi mim: - . 2 ee 0 60 | 302] 361] 416] 431] 353] 336] 228) 156] 148 
Date Number of eggs deposited—days following dropping. Total 
engorged . num- 
female Size. ber of 
dropped. 12 13 14 15 16 17 18 19 | 20 | 21] eggs. 
—— ey ee ee ee eee ee ee 
1908. 
Aug. 3 | 12 by 7.5 by6 mm........- 30 23 4 0 0 4 2 OW E\iez =a” (Byeral 
Aug. 4|14by9by6mm.......... 61 19 7 6 0 0 0 0; 0|20 4,547 
Do. 13) by 7.5 by 5.5 mim--. -- 60 34 21 4 3 4 0 0} 0] @) 3,661 
Do...| 12.5 by 7 by 5 mm. BO) echnas| 2s cela seen Seeemeleecemalneree -|eee E cllsescle=e5||mecmeies 
Aug. 6 | 12.5 by 8 by 5.5 mm....... 5 2 15 0 0 EH idl era eee |e ae Sale 2,127 
Dose | toy Sly po ee oe 12 ll 8 Os GR ce ele ee ee eee 3,374 
Awe. U7 |.13:9 bya. by. mm... 25-52. 24 Te an Gy el Ee aeeeete eee ele eel se] a ae ae 3, 852 
Aue. 6 | Lo by 8 by Gamm =. 225 see 32 5 0 0 0 0 0 0 | Q) 3,113 
Aug. 8 |} 13.5 by 8.5 by 6mm....... 41 19 9 3 Ol) (@\U aise oes seclecne|) “Sear 
Do: s4|12 bby. 8 by oro =| Fe 60 33 8 19 5 0 0} 0|50 2,923 
BSVETAEG | si5a.2 Masta oho te ode asae els coadlee sees cee|aeceacdlenwecsleeec seme] caams lees ese 3,424 
1 Died. 4 Apparently injured; died on 25th day. 
2 Died on 27th day. 
3 Not completely deposited; appears injured. 
5 Died on 23d day. 
The shortest period which we have observed to be required for 
incubation was 19 days and the longest was 202 days. 
During the 
former period the mean temperature was 87° F., the maximum being 
102.5° F. and the minimum 71° F. During the latter period the 
mean temperature was 54.26° F., while the maximum was 92.5° F. 
and the minimum 14° F. 
In the laboratory in August eggs hatched 
as soon as the twentieth day after deposition, an effective tempera- 
ture of 820° F. being required for their incubation. 
Taste XXXVIII.—Jncubation of Margaropus annulatus in the laboratory. 
. Hatching 
Eggs deposited. began. 
1908. 1908. 
MVE setae ate a Gos cre cites trtiate ae Selene June 19 
UBIO SAC an Anema ope er Seee ese: July 18 
DUP ING Sse eck c see ee nse le ae Aug. 6 
Alec cain Aeon ae aise <7 enpaes Aug. 26 
At ROS as eee eee. SEER Ee Aug. 29 
AE Te aiccceenioes o ce awss oun ae Aug. 30 
PANTS etl AS AL o£ Sept. 2 
RU Be LG aim an sas tae tens oes coe Sept. 4 
Temperature during incubation. 
Minimum 
incubation 
period. 
Days. 
Average | Total effec- 
Maximum. | Minimum. daily tive tem- 
mean. perature. 
°F ae a ee Be 
91.5 68 79.7 1,065 
94 70.5 82 897 
95 76.5 85.15 969. 50 
99 73 85.51 850. 25 
96.5 73 84. 76 877 
96.5 75 84.88 837.50 
96 75 84.62 874 
96 75 84. 01 820.25 
