140 LIFE HISTORY OF NORTH AMERICAN TICKS. 
adult longevity recorded was between 388 and 411 days. These ticks 
were kept on moist sand in the laboratory. The longevity of the 
sexes ayspears to be about the same. 
TaBLe LVI.—Longevity of adults of Amblyomma maculatum. 
Molted. 
Longev- 
==: = Date last tick died. ity in 
Date. Male. Female. | Total. days. 
| 
1907 1908 
IGCRN POT seats s' 22 5 cee oe See seers c 2 2 4:°| DGC: Gi kona cane eek os 365+ 
TD Yes (08 gs a a AR SEE. FG eR 2 thes 1 1 2 | Jan. 22-Feb. 14....... 388-411 
1909. 1910. 
IWS Shes Samael Sth oe apace = 3 1 0 lt | NOWMQ8RtE sks Sones 209 
May 4-! 1 1 2 | Sept. 26-Oct. 18....... 144-167 
EG reese i rete ete CER Tt 0 1 Vil Sept: 262282) ne eae 144 
Males and females that had been reared from nymphs when placed 
upon the host attached quite readily. Twelve days passed, however, 
before they were found in copulation. After a male mates with a 
female it usually remains with her until she drops; it then goes in 
search of another mate. Mr. J. D. Mitchell states that he has observed 
the sexes in copulation after having been removed from the host. 
Engorgement has been found to take place as soon as 14 days. 
Partially engorged females reattach if they have not been injured in 
being removed. The largest specimen which we have observed was 
collected partially engorged from a sheep; it reattached and engorged 
upon a bovine. This specimen remained attached for a day and a half 
after being apparently fully engorged. Upon removal it was found 
to weigh 1 gram and to measure 18 by 13 by 8mm. Next to Am- 
blyomma tuberculatum this is the largest species that occurs in the 
United States. 
Taste LVII.—Engorgement of females of Amblyomma maculatum. 
Females Period of 
Adults applied. Host. dropped attach- Size engorged. 
engorged. ment. 
1908. 1908. Days. 
PASTE ake 8 rere ot ans Sze ee cl ouee Bovine....| May 11...- 14 | 14 by 10 by 7mm 
ID ee eRe oe ee eeee ae eee aerate eaellee ds. cca) Maye 22 ae 15 | 18 by 11.5 by 8 mm 
CATT E2L (ais cme ores qelive ne ues Emane eae oe ie doen sar May 14 (2) 17 | 15 by 10.5 by 7 mm 
PAD ita Sears wer Seerste aaeae Sak See See ee Se Ura erage doseches May 15...- 18 | 18 by 12 by 7mm 
Males remain attached for long periods after the females drop and 
may mate with several females. This habit of remaining upon the 
host after the females have dropped accounts for so many males being 
taken at certain seasons of the year when females can not be found. 
On August 28, 1907, Mr. J. D. Mitchell of this bureau examined the 
ears of 340 cattle at a branding chute in Goliad County, Tex., and 
found 4 females and about 100 males, none of these being in coitu. 
The males were frequently in clusters, as many as 9 being counted in 
