1930 ] 
■ Development of Dermatobia hominis 
339 
5 mm. in diameter. The larva looks larger and has a 
yellowish color. The larva in No. 1 has a reddish tint 
as though it is still taking blood as food. No. 6 is still 
protruding the greater part of the time and continues to 
be very painful. There is considerable discharge from 
No. 5 and much irritation present. 
November 25. Larvae Nos. 2 and 4 spent considerable 
time last night in enlarging the openings to the lesions 
occupied by them and they both emerged this morning. 
While in the bath taking a shower I noticed larva No. 2 
as it came straight up out of the hole and dropped over on 
my arm. I immediately placed this larva in a test tube, 
and was about to return to the shower when I saw that 
No. 4 was protruding from the opening with a slight side 
to side weaving motion. It slowly and easily continued 
its emergence until it finally came entirely out with almost 
a slight spring. There was absolutely no pain or sensa- 
tion as these two larvse emerged, and had I not happened 
to see them as they did come out I should not have known 
that they were emerging. From the time when larva No. 1 
began to enter my arm as a tiny larva until it emerged 
mature and ready to pupate was 46 days and 15 hours, 
while the period of infestation with No. 4 was approxi- 
mately 46 days and 21 hours. These two larvse emerged 
within ten minutes of one another. This is probably the 
first record of the exact time between entrance and emer- 
gence of a larva of Dermatobia hominis. This afternoon 
a sharp, stinging pain and much movement was felt in 
No. 6. The bandage was removed and the larva was found 
to be protruding somewhat more than it had been previ- 
ously. During several minutes of observation the larva 
did not appear to be making any efforts to come out fru- 
ther and the bandage was replaced. About fifteen minutes 
later a movement was felt between the dressing and my 
skin, and an examination showed that the larva had 
emerged and after crawling nearly to the edge of the gauze 
pad was burrowing into the latter. There was no sensation 
felt with the actual emergence of this larva and it was 
only the movement of it against my skin that apprised 
me of the emergence. See Plate 13. 
