364 EXPERIMENT STATION RECORD. 



A remarkable new genus of Cephidae, S. A. Rohweb {Proc. Ent. 8oc. Wash., 

 11 (1015), Xo. 3, pp. 114-117, figs. 5).— The new genus and species here de- 

 scribed as Syntexis libocedrii was reared from larvje and pupae collected in the 

 cells near the outer surface of the wood of a large incense cedar (Liboccdrus 

 decurrens) at Rose Camp, Cal. 



Pneumonyssus foxi n. sp., an arachnoid parasitic in the lung of a 

 monkey (Macacus rhesus), F. D. Weidman {Jour. Parasitology, 2 {1915), No. 

 1, pp. 37-45, pi. 1). — The new species here described, tentatively placed in the 

 genus Pneumonyssus, is the fifth arachnoid species described from the air 

 passages of the monlvey. 



Fragmentary notes on the life history of the myriapod. Spirobolus mar- 

 ginatus, H. S. Barber {Proc. Ent. Sac. Wash., 17 (1915), No. 3, pp. 123-126). 



Migrating armies of myriapods, H. S. Barber {Proc. Ent. Soc. Wash.. 17 

 (1915), No. 3, pp. 121-123). 



Some new gregarine parasites from Arthropoda, Minnie E. Watson (Jour. 

 Parasitology, 2 (1915), No. 1, pp. 27-36, pis. 2). — Three species of gregarines in 

 Diplopoda, 9 in Coleoptera, and 5 in Orthoptera, one of which represents the 

 new genus Leidyaua, are describetl as new to science. 



FOODS— HTJMAN NUTRITION. 



Digestibility of some animal fats, C. F. Langworthy and A. D. Holmes 

 (U. S. Dept. Agr. Bill. 310 (1915), pp. 23).— This bulletin reports the results of 

 a study of the digestibility of lard, beef fat, mutton fat. and butter. The sub- 

 jects of the experiments, normal young men, were fed a basal ration, with 

 which were incorporated the fats to be Ftudle<l. Test periods included 3 days, 

 or 9 meals, of the ration containing the fat studieil. The average amounts of 

 fat eaten per subject per day were as follows : Lard. 90 gm. ; beef fat. 100 gra. ; 

 mutton fat, 53 gni. ; and butter, 100 gm. The amount of protein consumetl was 

 somewhat lower than that specified in dietary standards, but this amount was 

 a matter of personal choice. 



"The values for the digestibility of the carbohydrate content of the dieis 

 were 96, 97, 97, and 96 per cent [respectively, for lard, beef fat. mutton fat, and 

 butter] . . . 



" The average energy value available per man per day as calculated by the 

 usual factors and the coefficients of availability found in the digestion experi- 

 ments was 2,235 calories for the lard, 2.730 calories for the beef fat, 2,145 cal- 

 ories for the mutton fat. and 2,420 calories for the butter diet. The.se energy 

 quantities would be insufficient for severe nuispular activity, but should meet 

 the needs of those following sedentary occupations." 



From the close agreement of the average coefficients of availability of energy 

 calculated for the rations it is concluded that " the different fats did not ex- 

 ercise any unusual effect upon the digestibility of the other constituents of the 

 rations." 



The coefficients of digestibility of the fats studied after allowance had been 

 made for metabolic products were as follows : Butter fat. 97 per cent ; lard, 97 

 per cent ; beef fat, 93 per cent ; and nuitton fat, 88 per cent. From a compari- 

 son of these coefficients with the melting points of the fats it is concluded that 

 the fats of a low melting point are capable of a more complete assimilation 

 than those of a higher melting point. 



"In the beof-fat experiments, in which approximately 140 gm. of fat were 

 consumed per day, the subjects reported a tendency toward a laxative condi- 

 tion, which was not noted when the amount of fat consumed was decreased. As 



