1913] Pinkus — History and Halits of Sfcdangia Museidarum 153 



In one series, eggs were deposited on November 7, 1912 within 

 the puparia of Stomoxys calcitrans. On November 12 one fly pupa 

 was observed to have a minute larva feeding on its eye. On De- 

 cember 9 full-grown parasite larvae (see Plate I, fig. 3) were found 

 feeding on the exterior of fly pupa? within the puparia. One para- 

 site pupa (see Plate I fig. 4) was also found on this date. January 

 30, 1913, one adult parasite emerged, thus having a total devel- 

 opmental period of 84 days. During this period the average mean 

 temperature was 56.58° F. 



A number of puparia of Musca domestica were exposed to 

 Spalangia adults November 3, 1912. On November 9 the parasites 

 were observed to be ovipositing. In at least two of these the par- 

 asites were observed to have pupated when examined December 

 6. When again examined, on January 9, 1913, the pupae were 

 becoming black. Three adults had issued on or before February 

 20, 1913. In this test the total developmental period was less 

 than 109 days. In another experiment, in which Musca domestica 

 was used as a host, parasites were placed with the pupae on Novem- 

 ber 12, 1912. Oviposition occurred at noon on this date. Full 

 grown parasite larvae were found on January 5, 1913, and on 

 January 30, some had begun to pupate, thus having occupied 79 

 days in developing to the pupal stage at about the same tempera- 

 ture which prevailed in the above experiment where Stomoxys 

 pupae were used. One female parasite issued February 26, 1913, 

 after a total developmental period of 106 days. 



Parasites developed from the egg to the adult in 100 days in 

 puparia of Hoematobia serrata. In this test deposition took place 

 on November 12, 1912. Pupation began January 30, 1913 and 

 the first adult emerged February 20, 1913. This experiment was 

 also conducted in the same room as the preceding experiments. 



In another room in the laboratory, where the temperature was 

 considerably higher, a number of puparia of various species were 

 exposed to parasites on November 30, 1912. Pupation had begun 

 January 30, 1913, or 61 days after eggs were deposited. This shows 

 that the period from deposition to pupation was shortened 18 days 

 by the higher temperature in which the developing parasites were 

 kept. One adult female and one male emerged February 26, 

 1913 from a Hcematobia serrata puparium. The total develop- 

 mental period is therefore about 88 days. 



