1917] ENTOMOLOGY. 557 



A new genus of omphaline eulaphid chalcis flies from Maryland, A. A. 

 GiRAt^LT (€nm«f. Ent., 4S {1916), No. 12, p. 410). — Euderomphale fiiacipennis 

 11. g. anrl u. sp. from a meadow at Glendale, Md., is here describe<:l. 



Descriptions of and observations on some chalcidoid Hymenoptera, A. A. 

 GiEAULT (Canad. Ent., ^8 {1916), No. 10, pp. 337-5^4).— This paper includes de- 

 scriptions of nine new species representing the genera Eurytoraa, Rileya, 

 Asynipiesiella, Pleurotropis, Ormyrus, and Habrolepoidea, among which is A. 

 india reared from the tar leaf-folder {Gracillaria soyella) at Pusa, India; 

 and //. depressa reared from the eggs of Cyllene rohinice at Morristown, 111. 



The occurrence of the genus Achrysocharelloidea in North America, A. A. 

 GiRAtTLT {Cnnad. Ent., .',8 {1916), No. 10, p. 336). 



The red spider on cotton, E. A McGeegoe and F. L. McDonough ( U. S. Dept. 

 Agr. Bui. 4I6 {1911), pp. 72, pis. 8, figs. 21).— This is a detailed report of 

 studies of Tetranychus himacnlattis, its life history and habits, seasonal his- 

 tory, dispersion, insect enemies, and remedial measures, together with descrip- 

 tions of its several stages. While occurring throughout the United States, it is 

 known as a serious pest in only three regions, namely, in that portion of the 

 cotton belt including North Carolina, South Carolina, Georgia, Florida, Ala- 

 baniii, and INIississippi, where it is primarily a pest of cotton; in north-central 

 and western Colorado as a pest of fruit trees ; and in central California, where 

 the species is a rather serious pest of hop fields (E. S. R., 29, p. 261). It is 

 estimated that during a season of severe red spider occurrence the loss to the 

 cotton planters of the Southeast amounts to approximately $2,000,000. Investi- 

 gation has shown that it can maintain itself successfully on 183 species of wild 

 and cultivated plants, weeds, vines, bushes, and trees. 



" The control of the red spider is possible either by preventive or by re- 

 pressive measures. Great expenditures of time, labor, and material, however, 

 are necessary when the latter operation is undertaken. . . . Clean culture, or 

 the extermination of weeds and plants which breed the pest, is by far the most 

 vital means of prevention that can be applied in the case of field and truck 

 crops. In cases where cotton is grown within 100 yds. of dooryards containing 

 violets and other ornamental plants a careful watch of these plants should be 

 maintained in order that they may be sprayed or destroyed. By the persistent 

 maintenance of a finely pulverized surface mulch in fields the progress of 

 migrating mites is somewhat retarded and the development of infestation cor- 

 respondingly discouraged. . . . Trap crops, rotation, favorable planting time, 

 irrigation, etc., are either of only slight or of negative value. 



" Dispersion may be prevented by eliminating the plants in a field which 

 harbor the initial infestation. This may be accomplishetl by pulling the first 

 few plants which show infestation, or, in case the pest has secured a good foot- 

 hold, the elimination will be accomplished only by means of plowing up all 

 the affected portion of the field. In either case the stalks should be quickly 

 piled and burned with the help of a little straw or light trash. 



" Spraying for red spiders is effective if it is done with extreme care. There 

 are a few sprays which will give complete mortality when properly applied, 

 but a second spraying is necessary to kill the individuals that were eggs at the 

 time of the first spraying. A contact insecticide is absolutely necessary, and 

 it is vital that every leaf on an infested plant should be reached by the spray." 



A bibliography of four pages is included. A report of studies of this mite In 

 Oregon by Ewing has been previously noted (E. S. R., 32, p. 156). 



The sexual evolution of Sarcocystis muris, H. Crawley {Proc. Acad. Nat. 

 Set. Phila., 68 (1916), pt. 1, pp. 2-43. pis. 5). 



