298 



THE GYPSY MOTH. 



February 24, at noon, 80 more eggs had hatched ; at 5 

 P.M., 43 more from the same cluster, or 123 on the second 

 day. 



February 25, at 10 a.m., 20 more eggs had hatched; at 

 1.15 P.M., 47 more; and at 6.15 p.:i., 6 more, making 73 

 eggs which hatched on the third day. 



February 26, at 7.30 a.m., 87 more had hatched; at 1.30 

 P.M., 172, and at 5 p.m., 16 more, or 275 on the fourth day. 



February 27, at 7 a.m., 39 more had hatched; and at 5.40 

 p.m., 43 more, making 82 for the fifth day. 



February 28, at 7 a.m., 2; at noon, 26 ; at 5 p.m., no 

 more had hatched, making 28 eggs which hatched on the 

 sixth day. 



March 1, at 7 a.m., 2 more eggs had hatched ; at noon, 5 ; 

 and at 5 p.m., 2 more, making 9 for the seventh day. 



March 2, at 7.20 a.m., 1 more egg had hatched; and at 

 5 P.M., 1 more, making 2 that hatched on the eighth day. 



March 3, at 7.45 a.m., 1 more egg had hatched. No other 

 eggs hatched from this cluster. The total number of eggs 

 hatched from the cluster, in nine days, was 706, From 

 another egg-cluster, kejDt under similar conditions, 997 

 hatched in eleven days. 



To gain further information concerning the actual number 

 of caterpillars which may hatch from one egg-cluster, and the 

 time required for hatching, a number of egg-masses which 

 had been taken from the field were brought into a warm 

 room and placed in boxes, April 25, 1895. The caterpillars 

 were counted and then removed as soon as hatched. From 

 egg-cluster ^o, 1, 250 caterpillars were hatched in 2 days and 

 22 hours. From egg-cluster Ko. 2, 408 caterpillars were 

 hatched in 3 days, 17 hours and 10 minutes. From egg- 

 cluster No. 3, 708 caterpillars were hatched in 3 days, 17 

 hours and 15 minutes. From egg-cluster No. 4, 679 cater- 

 pillars were hatched in 3 da^^'s and 1 hour. From egg- 

 cluster No. 5, 393 caterpillars were hatched in 3 days, 22 

 hours and 30 minutes. From egg-cluster No. 6, 438 cater- 

 pillars were hatched in 4 days, 16 hours and 45 minutes. 

 The whole number of caterpillars from the six egg-clusters 

 was 2,876, an average of 479 to each cluster. The average 

 time in hatching was 3 days, 20 hours and 6|- minutes. 



