V . C. Bishopp and H. P. Wood 
157 
ventrally, this division showing slightly dorsally. In the specimen 
observed there was a large amount of viscid secretion on the mouthparts 
and vesica biloba, and the anterior half of the scutum was covered with 
this waxy secretion. 
The Egg: The eggs are ovoid in shape, and light to dark brown 
in colour, with shining surfaces. No counts to determine the exact 
number of eggs deposited by this tick have been made. Their number 
and the appearance of the mass are practically the same as in D. venustus. 
Three lots of eggs were observed to determine the incubation period. 
Two of these lots were kept in an incubator at an average temperature 
of about 90° F.; the other was kept in the laboratory. All the lots were 
in tubes containing moist sand. The first two lots began to hatch in 
14 days, and all of the larvae appeared to have emerged in less than 
12 days after hatching began. The third lot, consisting of 50 eggs 
deposited about January 1, 1911, shrivelled up and failed to hatch. 
The Larva: The habits of the larvae appear to be very similar to 
those of D. venustus. During most of their existence, after the first two 
or three weeks following hatching, they remain more or less scattered 
and crawl about much. The period after hatching is spent mainly in 
dense bunches near the ground. 
In one test of the longevity of larvae, in a bunch of about 
1000 larvae which began hatching December 25, 1910, the last indi¬ 
vidual died about March 5, 1911, having lived for a period of 70 days. 
In another lot consisting of about 2500 larvae which began hatching on 
the same day, on March 17, 20 larvae were still alive and some of them 
were able to attach themselves to a host. Hence the longevity of 
larvae hatched at this time may exceed 82 days. These lots were kept 
in the laboratory in tubes "which had moist sand at the bottom. 
Only one record of larval engorgement has been made. In this 
test 20 larvae (weak) were placed on a guinea-pig March 17, 1911. At 
least six of them became attached but died without engorging. The 
only one which became engorged dropped off on March 27, thus showing 
an engorgement period of ten days. 
This engorged larva measured 301 microns long, 215 microns wide 
and 151 microns thick. The abdomen was deep wine coloured and 
shining; the legs and capitulum pale yellow and translucent; the 
scutum brownish-yellow, darkest posteriorly. 
On April 19, 23 days after dropping off the host, this larva moulted 
to a nymph. During this period the mean temperature in the laboratory, 
where the larva was kept, was 75 - 3 F. 
