THK SKAll I KOlMl'AL Alt.M\ WdlJ.M. 63 



i (lays, and in another case from July 18 to 2'2, or -t days. In the 

 first instance the temperature averaged between 76° and 80° F. and 

 in the second from 80° to 88° F. Evidently this is the maximum 

 j:)eriod. 



As regards the duration of the entire life cycle, it was noticed that 

 eggs deposited July 3 produced caterpillars on the 0th, or in 6 days. 

 These penetrated the earth, being full-grown, on the SGth. making the 

 entire life period of the larva; IT days. They began to issue as moths 

 August 5. This gives a total period for the life cycle of 31 days for 

 extremely hot weather. In m ordinary outdoor summer temjiera 

 lure the period would be about 35 days, or 5 weeks. 



Our rearing records are not quite as accurate as could be desired, 

 owing to unfortunate conditions at the insectary and to three changes 

 in the office force during the time when the insect was under observa- 

 tion. There were, however, positively four generations here, and 

 about the same number was observed at Orlando. There is also 

 the possibility of an earlier fifth generation in nature. The exact 

 periods for the appearance of these should be recorded in the field. 



NATURAL ENEMIES. 



The unusual abundance of this species at Orlando, Fla., during the 

 season of 1007 afforded a most excellent opportunity for the study 

 of its insect natural enemies. These came under observation as early 

 as May and were still abroad as late as August, appearing to increase 

 somewhat as the season advanced. 



PxVRASITES. 



The parasitic species observed were seven in imml)ei-: the pre- 

 daceous enemies, six. 



Opliion titi/ri Pack. (?) — Issued July IT-August 1. 



Limnerium sp. — Issued May 25-30. 



Meteorus sp. — Issued July 11-August -2. 



Chelomus sp.— Issued July 6, 1908. 



'SpUocJialcis spp. — The Meteorus was attacked by two species of 

 secondary j^arasites of the family Chalcidida-. These issued .Vugust 

 -1 from (he ])('cnliar brown cocoons of the Meteorus. 



Wrnfli<'nii</ (jii<((J)-ip}istiilata Fab., a moderate-sized tachina Hy. is 

 also a parasite on the larva of this species. Adults issued August 8 

 but did not ap[)ear abundant. Of a lot of larva^ taken at random 

 from different portions of a field, upward of 50 per cent bore tachina - 

 fiy eggs. P^vidently a large percentage fail to hatch." 



"A small fly was also observed feeding on the pupse. It is Aphiochnla niijri- 

 rc'ijs Loew, one of the Phoridjx?. which comprises species of scaveniring habits 

 •:uid not parasitic. 

 CO— V 



