4:^0 



JOURNAL OF ECONOMIC ENTOMOLOGY 

 T.\BLE II. RECORD OF RESULTS OF BREEDING OF H. HOOKERl 



[Vol. + 



Besides those that emerged successfully there were five other nymphs 

 that were parasitized at the same time, but which failed to produce 

 adult parasites. When the nymphs were opened, one produced ten; 

 one, thirteen; one, eight; and one, eleven adults; and the fifth nymph 

 was found to contain four immature stages. An attempt was made 

 to carry these parasites another generation, but without results, the 

 failure due possibly to the lateness of the season. One tick which 

 produced thirteen parasites appeared to be parasitized only about 

 three times; in no case as many as thirteen times. This might suggest 

 that the parasite deposited several eggs each time she inserted her 

 ovipositor, or possibly some form of polyembryony. 



Economic Importance 



Several attempts have been made to cause the parasite to develop 

 on hosts other than those on which it was collected, but thus far 

 without positive results. It seems, however, since the parasite 

 naturally breeds on at least two widely separated genera that further 

 experiments should prove successful. It is true that the abundance 

 of Rhipicephalus sanguineus varies greatly where the parasite is found 

 but how much of this variation is due to the parasite cannot be 

 determined without further study. In any case, R. sanguineus has 

 always been found in sufficient numbers in south Texas to prove that 

 the tick is able to thrive in spite of the parasite. The effect can be 

 one of only partial control. 



On November 14, 1908 a shipment of 200 nymphs, divided into two 

 lots, one in a wooden box containing tissue paper, the other in a mailing 

 tube containing green sawdust, were sent to Prof. C P. Lounsbury 

 at Cape Town, South Africa. Parasites emerged from each lot, but 

 attempts to cause attack of the South African ticks were failures. 

 .Other lots of nymphs were collected in south Texas and shipped to Mr. 

 C. W. Howard at Lourenco Marques, Portuguese East Africa and 

 to Prof. P. Silvestri, Portici, Italy. In neither case were the parasites 

 successfully reared. 



* In refrigerator one day before emergence. 



