REVISION OF STREPSIPTEEA — PIERCE. 53 



HYLECHTHRUS, species. 



The males emerged from the pupa case with the dorsal side up. 

 The puparium is oriented in the same manner (S. S. Saunders, 1852). 



ACROSCHISMUS BOWDITCHI Pierce. 



Mr. Dury raised a male from a male host in capitivity ten days on 

 September 16, 1905, at 7 a. m., and on September 22, 1905, one 

 emerged from a male host which had been in captivity two weeks. 

 His records show that 2 males emerged prior to August 24, 4 prior to 

 September 13, 5 prior to September 16, 3 on September 16, 1 on 

 September 22, 2 prior to September 27. He also took 2 male pupae 

 on June 15, and 4 on July 3. 



ACROSCHISMUS PALLIDUS Brues. 



The time required for males to reach maturity after the wasp 

 emerged varied from about ten to seventeen days, the pupa cases not 

 being protruded between the abdominal segments until several days 

 after the latter left its pupal cell. Brues (1903) bred 24 males in 

 May. 



Data were also gathered by the writer concerning the stage of 

 development of this species. On September 23, 241 parasitized 

 wasps were killed by an overdose of anaesthetics in collecting the 

 nests. These wasps had 338 parasites, of which 26 had emerged, 

 76 females were mature, 188 males were in the pupal stage, 40 female 

 larvae and 8 male larvae were in the bodies of the hosts. 



On October 9, 16 dead male parasites and 10 alive males were 

 found in the breeding cage; 9 parasitized wasps were dead, from 

 which 3 males had emerged, and in which were 10 adult females and 

 25 male pupae. 



On October 10, 1 male matured; on October 12, 1 male; October 

 13, 3 males. On this last date 5 wasps were dead, from which 8 male 

 parasites had emerged, and in which were 2 adult females and 1 

 male pupa. 



On October 14, 3 males matured. On October 16, 2 wasps were 

 dead, from which 3 male parasites had emerged, and in which was 1 

 female adult. 



Of the wasps kept alive since September 23, 34 male parasites have 

 emerged, and yet on October 16 all of the wasps which have died 

 have had but 19 empty puparia. 



On October 27 a final count was made of the dead and alive wasps. 

 Eighteen wasps were dead, from which 21 male parasites had emerged, 

 and which contained 23 adult females and 2 male pupae; 11 para- 

 sitized wasps were still alive, from which 5 male parasites had emerged, 

 and in which were 10 adult females. These wasps lived at least a 

 84359— Bull. (36—09 5 



