760 EXPEEIMENT STATION EECOKD. 



Paraguay the relations obtaining between the arboreal species of Azteca and 

 Pseiidoniyrnia and the trees which they inhabit. 



It is said that Azteca not only makes use of interuodal cavities already exist- 

 ing in the stem of C. peltata, but also excavates fresh spaces or enlarges 

 existing ones at the expense of the living tissues of the tree. The presence of 

 colonies of Azteca does not prevent Cecropia from receiving much damage from 

 the attacks of other insect enemies, and the author is of the opinion that the 

 constant loss suffered by the tree from the depredations of Azteca itself involves 

 a more serious drain upon its vitality than the occasional raids of the leaf-cut- 

 ters. The occupation of Cecropia by these ants not only fails to afford protec- 

 tion against enemies other than the leaf-cutters but also even encourages the 

 assaults of such foes as woodpeckers and internally feeding lepidopterous larvae. 

 The author concludes that in the species observed by him the benefits of the 

 association between trees and ants are not mutual but are enjoyed by the ants 

 alone. 



The food plant of Enarmonia tristrigana, with, a description of mature 

 larva, C. A. Frost and J. N. Summers {Psyche, 16 {1909), No. 1, pp. 13-16).— 

 Stalks of Baptisia tinctoria at South Framingham, Mass., were found to be oc- 

 cupied by one or more of the larvae of this moth. 



Extermination of the maize-stalk borer, J. H. Lilienthal (Natal Agr. 

 Jour., 12 {1909), No. 6, pp. 723-730).— A brief account of the injury and meth- 

 ods of dealing with the corn-stalk borer. An Ichneumon fly is said to be an 

 important enemy of the pest. 



Catalogue of the lepidoptera Phalsenae in the British museum, G. F. Hamp- 

 SON {London, 190S, vol. 7, pp. XT+709+2S. figs. hS4). — A key to the genera of 

 the Acronyctinie is given. Eight hundred and forty-three species are described 

 and their habitat noted. 



Manual of North American diptera, S. W. Williston (New Haven, Conn., 

 1908, 3. ed., pp. 405, i)Is. 7, figs. 14I; rev. in Science, n. scr., 29 {1909), No. 753, 

 pp.- 898, 899). — In this third revised and enlarged edition, about 1,200 genera 

 are defined which, with the exception of a few doubtful forms, include all those 

 known to occur in North and Central America and the West Indies. More than 

 600 genera are defined more or less fully and decisively by ne^irly 1,000 figures. 



The appearance of the Hessian fly in 1908 and notes on its life history, 

 M. Wolff {Centbl. Bakt. [etc.], 2. AM., 23 {1909), No. 1-5, pp. 109-119).^^ 

 Studies on the biology of Mayetiola destructor at Bromberg in Eastern Prussia. 



Contribution to the study of trypanosomiasis and to the geographical dis- 

 tribution of some of the blood-sucking insects, etc., J. E. S. Old {Jour. Trop. 

 Med. and Hyg. [London], 12 {1909), No. 2, pp. 15-22). — Observations on the 

 flies and ticks collected by the author during 4 years in Nyasaland, British 

 Centi'al Africa, are here reported. 



The striped cucumber beetle, T. J. Headlee (New Hampshire Sta. Rpts. 

 1907-8, pp. 499-513, pi. 1, figs. 2). — The author here discusses at length the life 

 history, habits, and methods of combating this insect, which in New Hampshire 

 is single brooded. The literature is freely quoted in connection with the 

 account of the studies conducted. 



It was found in New Hampshire that all the pupae in breeding cages trans- 

 formed to adults before cold weather. The date at which the beetles appear 

 in the spring seems to vary with the season and latitude from some time in 

 April to early in Juae. In New Hampshire beetles were found pairing freely 

 on June 24, and copulation continued until about August 30. The first eggs in 

 1907 were obtained July 2 and the last August 6. In both field and cage experi- 

 ments eggs were deposited in the surface of the soil, singly or in groups, usually 

 within a crack or crevice anywhere within sevei'al inches of the plant. Dissec- 



