24(3 



after which all the ants were found to be dead. Several palms from 

 CaUfornia were fumigated against mealy bug [Pseiidococcus]. Two 

 cases of beneficial insects arrived for the Hawaiian Sugar Planters' 

 Association experiment station. 



FuLLAWAY (D. T.). Division of Entomology.— ^awatVaw Forester & 

 Agriculturist, Honolulu, xiv, no. 1. Januarv 1917, p. 11. 

 [Received 12th April 1917.] 



During the month of December the insectary handled 57,600 pupae 

 of the melon fly \Dacus cucurbitae], from which 1,900 females and 1,558 

 males of Opius Jletcheri were bred and distributed. 



The corn leaf-hopper parasites have now become established at the 

 U.S. Experiment Station. 



Du Porte (E. M.) & Vanderleck (J.). Studies on Coccohacillus acri- 

 diorum, d'H6relle, and on certain Intestinal Organisms of Locusts. 



— Annals Enfom. Soc. America, Columbus, Ohio, x, no. 1, 

 pf. 47-62, 7 tables. 



These experiments on the control of locusts by the use of Cocco- 

 bacillus acridiorum were made with the object of ascertaining the 

 value of this method under the conditions obtaining in Eastern Canada. 



The culture used was obtained from the Pasteur Institute in Paris, 

 and its virulence increased by passage through 12 lots of locusts. 

 After the twelfth passage, it was found that the maximum virulence 

 was reached. This increase of virulence is shown in tabular form, 

 as well as the greater virulence of the intestinal contents of locusts 

 which die late as compared with those from the same lot which die 

 earlier. 



The species experimented upon included : — Melanoplus femur- 

 rubrimi, M. bivittatus, M. atlantis, Dissosteira Carolina, Camnula 

 pellucida, Stenobothrus curtipennis and Xiphidium sp., which all 

 proved susceptible to C. acridiorum, as also were Gryllus pennsyl- 

 ranicus and some examples of Nemobius spp. The yellow bear 

 caterpillar {Spilosoma virginica) died after injection, but in the case 

 of the potato beetle {Leptinotarsa decemlineata), the number of beetles 

 and grubs which died after injection was not greater than those in- 

 jected with distilled water. The insect and other parasites of diseased 

 locusts were apparently not affected, as several Sarcophagid flies 

 were reared from diseased locusts and a large number of Gordiid 

 worms emerged from diseased or dead insects. Fowls, guinea-pigs, 

 rabbits and man are apparently not susceptible to infection. 



Experiments were carried out in the laboratory in order to discover 

 the effect of spraying locusts with a culture of Coccobacillus ; of these, 

 one died at the end of 30 hours, one in 2 days, one in 3 days and two more 

 at the end of 8 days, the remainder showing no symptoms of disease. 

 The effect of contaminating the soil resulted in one locust out of 

 twelve dying at the end of the first day, the rest being unaffected. 

 When several locusts were placed in an imsterilised cage from which 

 dead locusts had been removed, no mortahty resulted among them. 

 The effect of contaminating the food was tried on 17 nymphs, the 

 food being renewed daily and sprayed with either a pure culture of 

 Coccobacillus or a suspension of the intestines of dead locusts. There 



