REPORT OF THE STATE ENTOMOLOGIST IQI2 77 
in a slight depression on the cut surface of the head. These con- 
ditions persisted unchanged except that the maggots became pos- 
sibly a little more active with the progress of time till the morning 
of August 6th when there were many second stage maggots about 
3.5 mm long and some first stage maggots about 3 mm long. The 
difference in size between these two stages was so slight that the 
change from one to the other occurred without attracting particular 
notice. The night of the following day, August 7th, the second 
stage maggots were some 6 mm long and perceptibly larger. There 
was also observed one larger third stage maggot having a length of 
about 13 mm. The following morning, August 8th, four or five 
large third stage maggots were observed, and by night one-third 
of them had similarly changed. The following morning, August 
gth, most of the maggots visible, namely, some seven-eighths, were 
in the third stage and moving actively over the cut surface of the 
head. The maggots at this time were distinctly negatively helio- 
tropic and when kept in darkness showed little tendency to burrow 
into the tissues. They collected in a hemispheric mass an inch or 
more in depth on the upper cut surface and remained so long as 
it was kept dark, scattering only with the admission of light. This 
negative heliotropism was mare marked as the larvae developed 
and by the time they attained full size there was a speedy scatter- 
ing on admission of light, even though the mass of maggots when 
exposed to illumination had a depth of an inch or more and covered 
the ten or twelve square inches of surface. The following day, Au- 
gust roth, no small maggots were observed and all were evidently 
nearly full grown and ready to desert the carrion, such migration 
occurring the following morning. The maggots remained for sev- 
eral days in the upper layers of adjacent moist soil, being so num- 
erous for a time as to transform this part into a heaving, animated 
mass. The larvae began to become sluggish prior to pupation on 
the morning of August 13th, and that night puparia were numerous 
though there were still many full-grown larvae. Phormia larvae 
persisted in decreasing numbers till August 16th, and on the 25th 
numerous adults were obtained. The insects continued to emerge 
in large numbers for several days. 
The duration of the various stages is approximately as follows: 
eggs, 12 to 24 hours, much depending upon temperature conditions. 
The first larval stage lasted about three days, probably being 
somewhat prolonged by the rather low temperatures prevailing. 
The second stage persisted two to three days, while the period of 
