532 



SCIENCE 



[N. S. Vol. XXXVII. No. 953 



Anthomyidae." It is a critical revision of the 

 genera of the family, with especial considera- 

 tion of the male genital apparatus, and all the 

 plates represent hypopygia or lobes of the fifth 

 ventral segment. The authors consider the 

 family in the sense of Girschner, including 

 most of the Muscidse. In the supplementary 

 part are descriptions of many new species, 

 mostly from Russia. 



The progress of entomology in South Amer- 

 ica is unfortitnately slow, and for this reason 

 we welcome each new elementary treatise from 

 that quarter as an encouragement for the lo- 

 cal naturalists to collect and study their in- 

 sects. A new work of this character is by Dr. 

 C. E. Porter on the Myriopods of Chili.' He 

 gives an illustrated account of the structure 

 and habits of myriopods, and follows with an 

 annotated list of the 64 species so far de- 

 scribed from Chili. Many of the genera are 

 different from those of our country, and sev- 

 eral are peculiar to Chili. 



The anatomical part of the 34th (1912) 

 volume of the Zoologisches Jahriucher is 

 more than ordinarily occupied by entomolog- 

 ical articles. Mr. Edw. Schoenemund gives a 

 descriptive and biological study of the larvse 

 of the three large European Perlas," with 

 notes on the anatomy of the respiratory and 

 digestive systems, and the development of the 

 sexual organs. 



Mr. S. Surlov has an article on the salivary 

 glands in the head of some Orthoptera, espe- 

 cially Mantis'^ and their relation to similar 

 glands in Myriapoda. 



Dr. H. Mammen gives a comprehensive 

 study of the comparative morphology of the 

 stigma in various Hemiptera," both in 



"'Die Antliomyiden, " Aih. Eaiserl. Leop.- 

 Carol., Deutsch. ATcad. Naturf., XCV. (No. 2), 

 pp. 55-358, 35 pis., 1912. 



° "Introduecion al estudio de los Miraopodos, " 

 Santiago, 1911, 68 pp. 



" ' ' Zur Biologie und Morphologie einiger Perla- 

 Arten, " pp. 1-56, 2 pis. 



" ' ' Uber die Kopf driisen einiger niederen 

 Orthopteren, " pp. 97-120, 3 pis. 



" ' ' Ueber die Morphologie der Heteropteren 

 und Homopteren-stigmen, " pp. 121-178, 3 pis. 



Heteroptera and Homoptera. He finds that 

 in most Hemiptera there is but one muscle to 

 each stigma whose contraction closes the slit, 

 but in a few forms, two or three muscles 

 occur. 



Dr. W. Baunacke has a long article on the 

 sense organs of certain aquatic Hemiptera of 

 the family NepidEe.*' These organs on the 

 venter are considered to be organs of orienta- 

 tion. 



Mr. E. Foerster gives the results of a study 

 of the comparative anatomy of the sting of 

 various ants," and traces the homologies. 

 Nathan Banes 



SPECIAL ARTICLES 

 palmesthetic beats and difference tones' 

 In publishing the results of my experiments 

 on palmesthetic difference sensibility,^ I did 

 not take up the question whether the discrim- 

 inations with which we were dealing were of 

 rates of succession of discrete sensations, or 

 of differences in the characters or quasi-char- 

 acters of continuous sensations. That this 

 question must be raised is of course obvious, 

 since the vibration-rates of the forks I em- 

 ployed (between four and five hundred vibra- 

 tions per second), are below the fusion limit 

 as reported by Valentin,' von Wittich,* 

 Schwaner" and others. The results of Preyer,' 



^ ' ' Statische Sinnesorgane bei den Nepiden, ' ' 

 pp. 179-346, 4 pis. 



14 < I Vergleichend-anatomiselie Untersuchungen 

 iiber den Stechapparat der Ameisen, " pp. 347- 

 380, 2 pis. 



' From the Psychological Laboratory of the 

 Johns Hopkins University. 



^ Dunlap, K., "Palmesthetic Difference Sensi- 

 bility for Rate," Amer. Jour, of Physiol., XXIX., 

 108-114. 



'Valentin, "Ueber die Dauer die Tastein- 

 drucke, " Arch. f. Physiol. Heilk., XI., 438. 



* Von Wittich, ' ' Bemerkungen zu Prayer 's Ab- 

 handlung iiber die grenzen des Empfindungsver- 

 m'ogens und Willens, " Pfliiger's Archiv, II., 329. 



° Schwaner, ' ' Die Priif ung der Hautsensibilitat 

 vermittelst Stimgabeln bei gesunden und Krank- 

 en," Inaug. Diss., Marburg, 1890. 



"Preyer, W., "Die Grenzen dea Empfind 

 vermogens, etc.," 1868, 15. 



