558 EXPERIMENT STATION RECORD. [Vol.87 



that by physiological indices. It thus appears that temperatures is the chief 

 climatic influence in determining the rate of growth of the chestnut-blight 

 fungus. 



Chestnut blight in West Virginia (W. Va. Dept. Agr. Bui. 18 {1916), pp. 

 110-112). — This is chiefly a discussion of information reported by Broolis as 

 noted previously (E. S. R., 36, p. 150) and as supplemented by a later report. 

 It is stated that late in May, 1916, the blight was found to be still spreading 

 at the former rapid rate in the infected portions of West Virginia, but that 

 by prompt and vigorous measures much could probably be done to check the 

 disease in regions where infection is only sporadic and to keep it out of 

 territory not yet infected. 



Pycnia of Cronartium pyriforme, J. S. Boyce (Phytopathology, 6 (1916), No. 

 6, pp. 446, W). — The author reports having observed on seedlings and small 

 saplings of the western yellow pine (Pinus ponderosa) typical spindle-shaped 

 or fusiform swellings on the main stem which contained innumerable pycno- 

 spores. It is believed that the pines are probably infected in the summer or 

 fall of one season, the pycnia not appearing until the summer of the next season 

 at the earliest, while mature secia are produced in the late spring or early 

 summer of the third season. 



The white pine blister rust in Canada, W. A. McCubbin (Ann. Rpt. Quebec 

 Sue. Protec. Plants [etc.'], 8 (1915-16), pp. 64-72, figs. 5).— "While in both the 

 United States and Canada numerous cases of white pine blister rust (Perider- 

 mium st7-obi) have appeared on pines imported from Europe, only one region in 

 Ontario is known where the disease has attacked native white pines of con- 

 siderable size. The degree of infection on that small area, however, suggests 

 that this fungus might prove to be a very dangerous pest if it once obtains a 

 foothold. Only five-leaved pines are known to be attacked. The main area 

 affected (with the alternate stage on practically all species of Ribes but par- 

 ticularly on black currant) lies north of Lake Ontario, between Niagara Falls 

 and Hamilton, with isolated areas in other localities which are named. 



Experiments seem to show that the spread of the blister-rust fungus can be 

 reduced by spraying currant bushes, but not entirely prevented by this indirect 

 means. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



The Wyoming ground squirrel in Colorado with suggestions for control, 

 W. L. BuKNETT (Off. State Ent. Colo. Cirr. 20 (1916), pp. 11, pi. 1, figs. ;2).— This 

 account of the Wyoming ground squirrel (Citellus elegant) deals particularly 

 with its distribution by counties and methods of control. The author states 

 that from an agricultural standpoint It is the worst mammalian pest that has 

 to be contended with in Colorado. 



Destroying rodent pests on the farm, D. E. Lantz (U. S. Dept. Agr. Yearbook 

 1916, pp. S81-398, pis. 5, fig. 1). — Means for destroying rodent pests are de- 

 scribed. 



Bird life in Washington, Jennie V. Getty (Seattle, Wash.: JjOxcman (i Han- 

 lord Co., 1916, pp. 8-\-lS4, pi. 1, figs. 61). — A popular work dealing with the 

 birds of Washington State, their songs, and nesting habits. 



Observations on polycystid gregariaes from Arthropoda, Minnie E. Wat- 

 son (.Jour. Parasitology, S (1916), No. 2, pp. 65-75, pi. 1). — A new genus, 

 Bulbocephalus, with two new species, are described for the family Styloce- 

 phalidjfi. New species are described for Pyiinia and Gregarina, and new data 

 are given for gregarines already known. 



On a trematode larva encysted in a crab, Helice tridens, S. Yoshida (.Jour. 

 Parasitology, S (1916), No. 2, pp. 76-81, figs. 2).— This paper relates to a 



