10 



MISCELLANEOUS RESULTS OF WORK OF BUREAU IX. 



Summary of results obtained by rearing parasites from eggs of Pentatoma 

 ligata collected at Bar stoic, Tex., in 1905. 



When collected. 



Number 

 of egg 

 batches. 



Total Number 

 number of eggs 

 of eggs, hatched. 



Per cent 

 hatched. 



Number 

 of para- 

 sites 

 emerged. 



Per cent 

 produc- 

 ing para- 

 sites. 



Number 

 of eggs 



destroyed 

 by other 



agencies. 



Per cent 

 failing to 

 produce 

 nymphs. 



August 11-12 



Septembers 



6 

 13 



181 35 



246 20 



19 

 8 



11 

 148 



22 

 54 





 «35 



81 

 92 



Total 



19 



427 ! 55 ! 13 



189 



44 1 



87 







■ 









a Representing two batches of 13 and 22 eggs, respectively, 

 broken eggshells remaining. 



Presumably destroyed by ants, the 



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

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

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



Fig. 2. — Telenomus ashmeadi, an important egg parasite of Pentatoma llgata: 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 may be concluded that practically all the 

 eggs appearing intact which failed to hatch were destroyed by the 

 parasites. In support of this supposition 10 eggs which neither 

 hatched nor from which live parasites emerged, selected at random 

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

 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. Ashmead, 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 Telenomus 

 ashmeadi. An egg 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. 



