256 EXPERIMENT STATION RECORD. [Vol.43 



Spray calendar (Ga. State Bd. Ent. Bui. 53 (1919), pp. S6, pis. 2, fig. i).— 

 This furnishes practical information on insect pests and fungus diseases and 

 directions for their control. 



A revision of the Nearctic termites, with notes on biology and geo- 

 graphic distribution, N. Banks and T. E. Snyder (U. S. Natl. Mus. Bui. 108 

 {1920), pp. VIII-\-228, pis. 35, figs. 70).— In the preparation of this bulletin the 

 senior author deals with tlie classification and is to be credited with tlie new 

 species, and the junior author deals with the biology and geographic distribu- 

 tion. 



Part 1 (pp. 1-85), which deals with the taxonomy, includes tables for the 

 separation of families (Kaloterraitidfe and Termitidse), subfamilies, genera, 

 and species. It is pointed out that there are now 36 species and 1 variety 

 occurring in the United States, of which 17 species and 1 variety are here de- 

 scribed as new. Of these the authors recognize 3 species as belonging to the 

 genus Termopsis ; 9 as belonging to Kalotermes, 6 of which are new ; 1 to Neo- 

 termes ; 3 to Cryptotermes, 1 new ; 1 to Prorhinoternies ; 9 species and 1 variety 

 to Reticulitermes, 6 of which and 1 variety are new ; 6 to Amitermes, 4 of 

 which are new ; 1 to Anoplotermes ; 1 to Nasutitermes n. g. ; and 2 to Con- 

 strictotermes. The revision is followed by a catalogue of Nearctic termites with 

 synonymy (pp. 77-82) and an index to species, and a record of the location of 

 existing type specimens of Nearctic termites. 



The second part (pp. 87-211) consists of biological notes and is devoted to a 

 discussion of the bionomics of Nearctic termites. References to biological or 

 economic literature on the Nearctic species and a key based on the biology an<l 

 prominent structural characters are included. A 10-page list of literature cited 

 or read (pp. 198-206), part of which is annotated, arranged chronologically, is 

 included. The work includes a full index to the subject matter. 



The meadow plant bug, Miris dolobratus L. (Leptopterna dolobrata L/.) , 

 A. TuLLGREN (A'. Landtbr. Akad. Handl. och Tidskt:, 58 (1919), No. 5, pp. 299- 

 314, fiffs. 18; also in Meddel. Centralanst. Forsoksv. Jordhruksomrddet No. 182 

 (1919), pp. 19, figs. iS).— (This is an account of a plant bug which attacks 

 cereals and grasses in many parts of Sweden. As a result of its attack the 

 leaves and stalks of the plant become white and the spikes fail to develop 

 normally. 



A detailed account of the species in the United States by Osborn has been 

 noted (E. S. R., 40, p. 260). 



The grape scale in California, E. O. Essig (Mo. Bui. Dept. Agr. Cat. 

 (1920), No. 1-2, pp. 37-39, figs. 2). — The author records the occurrence of the 

 grape scale for the first time in California, a considerable number having been 

 collected on the American vine of the Catawba variety at Oakland on November 

 7, 1919. 



On the spermatogenesis of the louse (Pediculus corporis and P. capitis) , 

 with some observations on the maturation of the egg, L. Doncaster and 

 H. G. Cannon (Quart. Jour. Micros. Sci. [London], n. ser., 64 (1920), No 255, pp. 

 303-328, pi. 1, fig. 1). — The data have been summarized as follows: 



"The somatic chromosome number of both sexes is twelve, but spermatogonia!; 

 mitotic figures show only six. There is some evidence that these are double, and 

 we ascribe the existence of the apparently haploid number in the spermatogonia 

 to premature pairing. There is only one spermatocyte division, which is ex- 

 tremely unequal, leading to the separation of a minute polar-bodylike cell, which 

 degenerates. The centrosome of the spermatid is double, and from each halt 

 an axial filament grows out, so that the developing spermatozoa have two con- 

 spicuous axial filaments. The development of the mitochondrial body is de- 

 scribed. The acrosome is derived from a deeply staining body which appears in 



