864 EXPERIMENT STATION EECORD. 



lected on a jack rabbit at Green Valley, Cal. '"To date the species has been 

 taken at Corpus Christ! and Brownsville, Tex., also Green Valley, Cal., in the 

 United States, and from Monterey, Mexico, and from Louren^o Marquez, Portu- 

 guese East Africa." 



Observations made show that the parasitism varies considerably in the same 

 localit3^ In records of parasites reared, here presented in tabular form, the 

 maximum number of parasites per tick was 17, the minimum 3, and the aver- 

 age S. It took from 20 to G7 days, with an average of 32, from the date of 

 collection for the adult parasites to emerge. 



The acariasis of the vine, E. PANTANiiLLi (MarccUia, 10 (IDJl), No. .'/, pp, 

 132-150, figs. 16). — ^An account of the occurrence and nature of the injury of 

 the grapevine caused by PhyUocoptcs vitis. 



A new species of Dermacentor and notes on other North American Ixodidse, 

 F. C. BiSHOPP {ProG. Biol. Soc. Wafth., 25 (1912), j}p. 29-37, pJ. 1).— Derma- 

 centor hunteri, the species here described as new, was taken in numbers on 

 mountain sheep (Ovis mexicanus), at Quartzsite, Ariz. 



A serious chicken pest (Argas miniatus), E. K. Carnes {Mo. Bui. Com. 

 Ilort. Cal., 1 (1912), No. J,, pp. 136-139, fig. i).— This is a brief account of the 

 fowl tick (A. miniatus). 



This tick was first reported from Merced County in 1894. Later reports 

 from the vicinity of Sacramento and San Joaquin counties show the presence 

 of the pest in alarming numbers and causing serious damage to fowls. 



The use of sweetened poisons against the grape root-worm, and the rose 

 chafer, F. Z. Hartzell (Jour. Ecou. Ent., /, (1911), No. 5, pp. Jfl9~J,22) .—This 

 is a brief report of results obtained in 1911 in continuation of the investigations 

 previously noted (E, S. R., 24, p. 751). 



The additional data secured are said to confirm the author's first claims and 

 to show that even better results may be secured by using 2 gal. of molasses 

 instead of 1 gal. Experiments with the grape root-worm " show that the use 

 of the molasses-arsenate of lead mixture gives superior results, since the in- 

 ability to cover all the foliage is balanced by the habit of the beetles seeking 

 the sweet and also the insects are killed instead of being driven to other vines 

 as appears to be the case with other mixtures. The formula we recommend 

 is 6 lbs. of arsenate of lead, 2 gal. of molasses, and 100 gal. of water." 



The behavior of the rose chafer toward arsenate of lead alone or with 

 Bordeaux mixture is similar to that of the root-worm, as has been determined 

 by cage experiments and field observations. The use of molasses with arsenate 

 of lead in Bordeaux mixture gave the same results as when the arsenate of lead 

 and Bordeaux were used alone. 



Carbon disulphid explosion from heated corn, W. E. Hinds (Jour. Econ. 

 Ent., Ji (1911), No. 6, pp. 532-535). — An explosion of carbon disulphid used in 

 fumigating unhusked corn in a concrete room is described. "It seems certain 

 that the large mass of wet coi'u in the conci-ete building, from which moisture 

 could escape only upward, was at the time of treatment undergoing a heating 

 which produced a temperature of at least 300° F. in some part of the mass. 

 This high temperature started the explosion as soon as the vajwr of the liquid 

 poured on top of the corn had penetrated to a point where such heat occurred." 



It is stated that the injury to the grain was not great, although the shucks 

 or husks were burned more or less on several hundred bushels of corn. 



Methods of determining the toxicity of hydrocyanic-acid gas, G. A. Cole- 

 man (Jour. Econ. Ent., Jf (1911), No. 6, pp. 528-531, pis. 2).— The author pre- 

 sents a description of the apparatus and methods developed during the course 

 of fumigation investigations at the California Station. 



