206 



DoziER (H. L.). An Ecological Study o! Hammock and Piney Woods 

 Insects in Florida. — Ajih. Ent. Soc. Amcr., Coliimhus. Ohio, xiii, 

 no. A. December 1920, pp. 325-380, 22 figs. 

 In the second part of this paper the relation of insects to the above 



environment is discussed. Lists are given of those associated with 



the more important trees. 



Peterson (A.). Some Studies on the Influence of Environmental 

 Factors on the Hatching of the Eggs of Aphis avenae Fabricius 



and Aphis ponii De Geer. — An7i. Ent. Soc. Amer., Columbus, 

 Ohio, xiii, no. 4, December 1920, pp. 391-400, 1 plate. 



Further experiments with eggs of Siphonaphis padi, L. {Aphis 

 avenae, F.) and A. pomi, De G., in relation to moisture, show very 

 similar results to those already noticed [R.A.E., A, viii, 45]. During 

 the observations made in the past four years, 1917 to 1920, the 

 percentage of hatchings varied considerably, probably as a result of 

 weather conditions. The percentage is greatly reduced if dry weather 

 prevails during the 10 to 14 days previous to hatching. Conditions 

 producing high evaporation probably make the outer shell of the 

 egg brittle and easily broken by the growing embryo. Early rupture 

 of the outer coat is detrimental, as it exposes the permeable membrane 

 for a longer time to evaporating influences. 



Observations were also made with regard to the influence of 

 temperature on the rapidity of the splitting of the outer layer, but 

 no definite statement can be made in this connection, as the factors 

 producing evaporation before the eggs were brought into the laboratory 

 may have been different in the two seasons. 



Reinking (O. a.). Diseases of Economic Plants in Southern China. — 



Philippine As^ric, Los Banos, viii, no. 4, November 1919, 

 pp. 109-134, 3 plates. [Received 28th February 1921.] 

 In this list of diseases the plants are arranged alphabetically accord- 

 ing to their popular names. Although the paper deals primarily with 

 fungous diseases, borers are mentioned as attacking Citrus spp. 

 and thus predisposing the trees to the attack, of fungi. Aulacaspis 

 pentagona, Targ., is recorded as causing severe damage to peach 

 {Prunus persica). 



Mendiola (N. B.). a Review of the Rice Investigations at the College 

 of Agriculture. — Philippine Agric, Los Banos, viii, no. 5, 

 December 1919, pp. 145-160. [Received 28th February 1921.] 



The chief pest studied in connection with rice investigations was 

 Leptocorisa acuta (rice bug), against which several remedial measures 

 that were tried proved imsuccessful. It may be possible, however, 

 by selection, to obtain a strain of rice that would be naturally resistant 

 to the attacks of this bug. 



Morrison (H.). U.S. Bur. Ent. The Nondiaspine Coccidae of the 

 PhiUppine Islands, with Descriptions of apparently New Species. — 



Phillippine Jl. Sci. .Manila, xvii, no. 2, August 1920, pp. 147-202, 



1 plate, 40 figs. [Received 28th February 1921.] 



The new species described are : — Lophococcus convcxus, on Pithccolo- 



biiim sciiiiferum and Peltophoritm ferrugineuni ; Rhizococcus philip- 



pinensis, on Fictis sp. ; Synacanthococcus hispinosus, on Ficiis sp. ; 



