ROTATION OP 1 HOSTS. 4 ( .> 



Important gaps exist in the host rotation of Catolaccm incertus. 

 Its hosts breed as follows: 



Anihononms xujiuihm breeds from April II to June 12. 



AfUhonomUS fulwu breeds front May 3 lo July L2. 

 Auletes tenuipes breeds from May 9 to May 25. 

 Zygobaris xcmthoxyli breeds from May LI to June 29. 

 Anthonomus seneolvs breeds from May 17 to July L2. 

 Anthonomus nigrinus breeds from June :\Q to July is. 

 AnthonoTMU albopilosus breeds from August 26 to September 29. 

 Aiilhononius eugenti breeds from October 6 to October 31. 

 AnthonomUS disjunctus was found breeding October 1 1 to II. 



The known habits of the hosts of Ceramhycobius cyaniceps are as 

 follows : 



Tylodermafoveolatum breeds from June 22 to September 2:1. 

 Trichobaris toana breeds from June 26 to October 11. 

 Lixua mu8culus breeds from August 11 to September L9. 

 Anlhonomus nlbopilosus breeds from August 26 to September 29. 



The following data comprise all that is known of the hosts of 

 Eurytoma tylodt rmatis: 



Tylodcriiuiforcolatuni breeds from June 22 to September 23. 

 Lixus scrobicollis breeds from July 12 to April 17 (following year). 

 Anthoiiomus squamosus breeds from August 11 to September 19. 

 Orthoris crotchii breeds from August 11 to September 19. 

 Lixus musculus breeds from August 11 to September 19. 

 Anthonomus disjunctus was found breeding October 11 to 14. 



In the field at Dallas upon which release experiments were con- 

 ducted, and in a series of five fields in various directions from Waco, 

 it was found that the various species of parasites were exceedingly 

 localized, indicating that the parasites were derived from the imme- 

 diate vicinity. 



On the Dallas field, by reference to the tables given in Section II, 

 it will be noticed that Plat B with one small exception was the 

 only plat in which Catolaccus was found; that Plat B was the only 

 one from which Cerambycobius was bred; that Eurytoma \v r as not 

 found in Plat C, but was predominant on Plat E; and, finally, that 

 Bracon was well distributed. 



At Waco on all five fields Bracon mellitor was present in the pro- 

 portion of 20 to 50 per cent. On the prairie land field, surrounded 

 only by Ambrosia, Helianthus, and Xanthium, 41.6 per cent of the 

 parasites were Eurytoma tylodermatis . On the other fields, which 

 were on the bottoms, only one Eurytoma was taken to a field. Cato- 

 laccus incertus was present on the prairie land field and one bottom 

 land field. Cerambycobius was present in all the bottom lands and 

 very numerous, 58.3 per cent, in a field which had considerable 

 Solarium rostratum about it; it was entirely absent on the prairie. 

 The commonest plants on the bottoms w r ere Heteroiheca subaxillaris, 

 Croton spp., Solarium spp., and Xanthium. 



10292— Bui. 73—08 4 



