10 



MISCELLANEOUS KESULTS OF WORK OF BUREAU IX. 



Suiiiiiiarn of nsiill.-t nhtaliicd hi/ reariiii/ parasites from eggs of Pcntatotna 

 Viiiata collected at Barstow, Tex., in 1905. 



bv other proautc 

 agencies. ".*"^f"=- 



Wlu'ii colU-cted. 



August 11-12 

 September 12 



. Total.. 



Number 

 of egg 

 batches. 



Total Number 

 number of eggs 

 of eggs, hatched. 



181 

 246 



Per cent 

 hatched. 



Number 

 of para- 

 sites 

 emerged. 



41 

 148 



Per cent 

 produc- 

 ing para- 

 sites. 





 a 35 



35 



87 



"Representing two batches of 13 and 22 eggs, respectively. Presumably destroyed by ants, the 

 broken eggshells remaining. 



Shrinking of the eggs, indicating infertility, occurred in no case 

 among the eggs inchided above. From the fact that adult para- 

 sites frequently fail to emerge from the egg of the host even after 



Fig. 2. — Telenomn saghmcxuU, -An important egg parasite of I'cntatoina ligata: Adult female and antenna 

 of male. Highly magnified (original). 



breaking through the shell — and as far as observed it seldom occurs 

 in nature that eggs of the conchuela fail to hatch when not destroyed 

 by outside agencies — it ma}' be concluded that practically all the 

 eggs appearing intact Avhich failed to hatch were destroyed by the 

 parasites. In support of this supposition 10 eggs Avhich neither 

 hatched nor from which live parasites emerged, selected at random 

 from the 19 batches above mentioned, were opened and each Avas 

 found to contain a dead adult parasite. The specimens bred from 

 the eggs of P. ligata and also of P. sayi from Barstow were all of the 

 same species and identified by Dr. William H. x\.shmead, of the U. S. 

 National Museum, as a new species of the genus Telenomus (fig. 2). 

 The writer will describe the species under the name Telenom^is 

 ashmeadi. An Qgg batch of the conchuela containing hatched and 

 unhatched eggs is shown in Plate I, figure 1, and a parasitized egg 

 batch in Plate I, figure 2. 



