REPORT OF THE STATE ENTOMOLOGIST IQI2 J? 



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 

 9th, 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 10th, 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 



