FOODS ANIMAL PRODUCTION, 1069 



from tlie literature ot the sul)ject and from personal observations, the various details 

 of structure, life history, and habits of this species in all its stages. Especial atten- 

 tion is given to a discussion of the breeding grounds of these mosquitoes. 



New^ guests of the Dorylinae of the Neotropic and Ethiopian regions, E. 

 Wasmaxn (Zodl. Jdhrh., Aht. Sj/st., 14 [1900), No. 3, 2>p. '215-289, pl». ;?).— This paper 

 contains a discussion of the robbing habits of these ants, together with brief notes on 

 their so-called "guests," and descriptions of new species. 



The larva of Lonchoptera, J. C. H. de Meijere {Zool. Jalirh., Aht. Syst., I4 

 {1900), X<}. 2, pp. 87-132, ph. S) . — An elaborate account of the anatomical structure 

 and physiological relations of this genus. 



A report on the injurious outbreaks of Lyman tria monacha in SOderman- 

 land and Ostergotland in the year 1899, together with measures for com- 

 bating this insect, ,1. H. Wekmelin et al. {Ent. Tidskr., 21 {1900) No. 2, pp. 

 97-111). — An a])parently infectious disease of the larvt« of this species was noted and 

 tables were given showing the nund^er of diseased and parasitized larvfe among a 

 large nundierof specimens which were collected. Brief notes are given on the insect 

 enemies of the insect in its various stages. In com])ating the attacks of this insect 

 Raupenleim and banding methods were used. 



Description of a new species of Psylla, destructive to forest trees, CJ. B. 

 BucKTON {Indian. 3fi(.^. Notei^, .•> {1900), No. 2, pp. 35, 3i!,Jigs. 6). — A technical descrip- 

 tion is given of a new species under the name of P. obsoleta. The insect was reported 

 as injurious to young specimens of Diospyros mdanoxylon. The leaves of the young 

 plant were attacked and galls were formed. The insect left ita gall in January or 

 February. After the departure of the insect the galls disajipeared, leaving small 

 holes in the leaves. 



A hemipterous insect parasite upon Hyponomeuta malinellus and H. pade- 

 lus, A. (riARi) {Bid. Soc. Eut. Fr<tnci',1900, No. 18, pp.359, 300). — The larvte of these 

 insects are reported as being jiarasitic to a considerable extent upon Atractotomus mali. 



FOODS—ANIMAL PKODUCTION. 



The availability and fuel value of food materials, W. O. Atwater 

 and A. P. Bryant {Connect lent /Starrs />ta. Rpt. 1899, pp. 73-110). — ■ 

 The aiithors discuss the so-called availability of foods (see p. 1075), the 

 proportion of nutrients supplied by different groups of food materials 

 in the averag-e diet, the availability of different classes of nutrients in 

 food of mixed diet, heats of combustion of nutrients, fuel value, and 

 related topics. The discussion is based upon the results of nutrition 

 investig'ations carried on under the auspices of the Department of 

 Agriculture as well as those carried on at the station. A large num- 

 ber of analyses have shown that the ordinary factoi- for computing 

 protein, l. <?., 6.25, is not applicable to all classes of food. The follow- 

 ing factors are proposed: 



Proposed nitrogen factors for the protein of different groups of food materials. 



Kind i>f food material. 



Factors 

 proposed, 



Factors 

 for re- 

 calculat- 

 ing 

 protein. 



Animal foods 



Wlieat, rye, barley, and their manufactured products 



Maize, oats, buckwheat, and rice, and their manufactured products. 



Dried seeds of legumes 



Vegetables 



Fruits 



6.2.5 

 5.70 

 (i.OO 

 P. 25 

 .5.65 

 5.80 



0.912 

 .960 



.904 

 .928 



