114 LIFE HISTORY OF NORTH AMERICAN TICKS. 
TasLeE XXXVII.—Oviposition of Margaropus annulatus engorged on bovine. 
Date Number of eggs deposited—days following dropping. 
engorged : 
female Size. 
dropped. 1 2 3 4 5 6 7 8 9 LO at 
1908. : 
DOK YN) lone yesylon a yacebicleneeye yee 0 0] 481] 676] 754] 535] 384] 326) 194] 105 53 
Aue 4 AL by 9 by 6imm 2252. See oe 0 PAL 596 857 711 708 576 | 443 166 | 264] 112 
Do. Bsby v-o) Wyo oem oe 0 0} 297 560 | 457 514] 511 442 | 372 | 241 141 
Dos a 225 bya yes ndMesceee ee 0 0| 494] 511 | 320] 500] 381] 272) 159 36 0 
Ae. 6.) 12-5) by sib yeoeo mmm aae 0 86 | 386] 338] 427) 393 | 257] 139 57 12 10 
Dots 13 Dyisibyib:> mine eee 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| 2292) 76| 4 
Aug.. 613 by Siby.6 mms. 2... ---- 0 OUe402i 1 481 NG124) S56ul 2i2 We oSOls 2280|) 28 17 
Aug. 8 | 13.5 by 8.5 by6mm....... 0| 177] 441] 602} 729| 978| 491] 455| 245] 150] 61 
Do 12°5 by, 8 byo:5 mm 3.2. 0 60 | 302) 361 | 416] 481] 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 
1908. 
Aug. 3) 12) by, 7-5 by mmo. =o 30 23 4 0 0 4 B 0) @ 22 Sa5ae 
AUS 4)14by9by6mm.......... 61 19 7 6 O60 0 Dj Oo) 4,547 
0..-| 13 by'7.5 by 5.5 mma... 60| 34] 21 4 3 4 0] 0| 0|@)| 3,661 am 
Doz) | 2:bibyi@ byro mime esse SO ilee sol] Maer AiR eae a alia ohare, oie ers ileal Ase foe ae 2,673 
AWE 164 | 1225 Dyes Diy proses eee 5 2 15 0 0 SO aks Sees ee eee Qa 
Doles) Ts byi8i Dye: one se oe 12 11 8 Oke eee eee 5 el ee 3,374 
ATES pls: 9) Dyxo ND yp TOME a. sneer 24 1904 a 5) A ee eae ese) Se ete eo | Re eso 3,852 
Age: (6.13 by 8 by Gum. .2254- 22 32 5 0 0 0 0 0 | @) 3,113 
Aug. 8 | 13:5iby,8:-5 by6.mm-._. 3222 41 19 9 3 OFS @)iiace see Pease A isco eer 4,401 
Doz) 12:5iby78 Dyjo-omMie = oe 60 33 8 19 5 0 0] 0|50 2,923 
Na fol 2 (ch | a es ARO 2 a Sy Al Paetied  U g eA 2 [Perey | Pe oral re eee ml = Mae ee 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. 
TaBLE XXXVIII.—Incubation of Margaropus annulatus in the laboratory. 
SSS 
Temperature during incubation. ay 
. Minimum ¥ 
Eggs deposited. pee incubation Average |Totaleffec- 
period. |\aximum.|Minimum.| daily tivetem- 
mean. perature. , 
1908. 1908. Days. mae SURE Odie ORs 
Mayes te. mer ene ee June 19 29 91.5 68. 79.76 1,065 
WUINe QO ena cee eet eee eee July 18 24 94 70.5 82 897 
Tialivel 5-22, Fa eRe ee See Eee Aug. 6 22 95 76.5 85.15 969. 50 
SANT Oi eres ae eee ee ee ee Aug. 26 20 99 73 85. 51 850. 25 
AIG OS SERE Seley rel ee ee Aug. 29 21 96.5 73 84. 76 877 
PATS IS i Ce Se er cee eee ne eee Aug. 30 20 96.5 75 84. 88 837.50 
oN 0 festa 18 JER ee Oe ex eee Sept. 2 21 96 75 84. 62 74 
USS GA = iol eee eet ees Sept. 4 20 96 75 84.01 820. 25 
