54 BULLETIN G6, UNITED STATES NATIONAL MUSEUM. 



week longer (but were not carefully observed). From five, it appears 

 that the male parasites had been out thirteen or fourteen days. 



A summary now shows that since September 23, 34 parasites 

 emerged, and yet the wasps contained 43 empty puparia, which 

 indicates that the wasps containing 4 of these empty puparia lived 

 thus from before September 23 until about October 9, while those 

 containing the remaining five died between October 9 and October 13, 

 thus showing a possibility of living over sixteen days with an empty 

 puparium in the abdomen. Brues (1905, 293) comments on the 

 remarkable fact that 7 wasps were captured in the field with empty 

 puparia. These data given above should dispel any further doubts 

 as to the abilit} r of the wasps to live after the exit of the parasites. 



An examination of 2 wasp larva? on September 28 showed no par- 

 asites; in 10 wasp pupa? but 1 female parasite was found; in 10 

 teneral adults 2 female parasites were found. It would seem that 

 the parasitized wasps had developed most rapidly, or that the period 

 of triungulinid activity ceased before the last eggs were deposited. 



An attempt to hatch male parasites from dead wasps failed. A 

 pupa removed from its host remained alive at least two days, but the 

 adult did not mature. This experiment demonstrated the presence 

 of a liquid surrounding the pupa in its puparium. 



As to the time of day, the author had one emerge at 2.32 p. m. on 

 October 10; one in the p. m. October 12; at 12.10, 12.20, and 12.26 

 on the 13th, and at 8.50, 9, and 10.5 on the 14th. 



Several observations were made upon the longevity of this species. 

 One found at 2.32 lived until 4.13; one found at 12.26 immediately 

 after emergence lived until 3.15; one found at 9 a. m. lived until 2 

 p. m., and one lived from 10.05 until 2. Thus five hours was the 

 longest any were kept alive. In this period a great distance could be 

 covered and there can be little doubt but that most of the males fulfill 

 their mission. 



On October 13, 1905, the writer had an opportunity of watching 

 the activities of a male almost from the moment of its exit. None 

 were ever seen in the act of emerging, however. The life of the insect 

 was divided into distinct periods: First was the period of violent, 

 feverish activity, succeeded by an even longer period of nervous 

 quietude, then by a few minutes of violent struggle, and finally a 

 collapse and a diminisliing nervous quivering. 



During the period of activity the buzzing was very distinct at 

 several inches distance. The wings and elytra are in constant and 

 very rapid vibration even when the insect is not flying. The noise 

 is made by the elytra. The antenna? move constantly, the two 

 branches being capable of separate movement. The abdomen moves 

 a great deal, bending down and forward (thus giving added weight 



