638 ENTOMOLOGICAL NEWS. [December, 



families, tribes and genera. Lists are given of genera unknown to the 

 author and not classified, of genera incorrectly placed with the Ichneu- 

 monoidea, and of authors and works quoted ; a bibliography of genera 

 alphabetically arranged, synopses of the families of Hymenoptera, and 

 lastly an index. The author "has had material for examination from 

 all parts of the world, and hopes in the tables he is now publishing to 

 place the families, subfamilies, tribes and genera on a better foundation. 

 . . . Very few persons have given any attention to these insects, and the 

 necessity for these tine subgeneric and tribal divisions is evidently appa- 

 rent to only a few active workers. The great majority of the workers in 

 other groups seem totally ignorant of this vast complex, or at least have 

 no conception of its immensity, or the difficulties encountered in study- 

 ing and identifying material belonging to it derived from different parts 

 of the world .... When the body of this work is examined ... it is 

 found that no less than eleven hundred and forty genera, or more, have 

 been recognized and tabulated, although when Burmeister [wrote] . . . 

 in 1835, the Ichneumonoidea contained or\\y shout one hundred and nine 

 genera. ... In my tables, therefore, there will be found many genera 

 which by some eminent living hymenopterologists are thought to be of no 

 value, but which the writer, on the contrary, holds to be good and dis- 

 tinct — -a difference of opinion that time alone can settle." — Cameron, 

 P. Hymenoptera, vol. i, pp. 475-487 [Index], i-xii, title page ; vol. ii, 

 pp. 405-413 [Index], i-xi, title page, 15. — Friese, H. — New species of 

 bees from South America, 41, 12, June ; New species of the bee genera 

 Melipona 111. and Trigona Jur.*, 49. — Harrington, W. H. Cata- 

 logue of Canadian Proctotrypidae,* 134). — Moreno, A. Observations 

 concerning the habits of ants [m Spanish], Memorias y Revista de la So- 

 ciedad Cientifica " Antonio Alzate " xiv, 11-12, Mexico, 1900. — Knclow. 

 Remarks on the distribution of the sexes in Hymenoptera, 84, Oct. 18. 

 — Szeplig'eti, G. Joppinai of the Hungarian National Museum,* 49. 

 — Weed, C. M., and Fiske, W. F. The relations of Pimp/a con- 

 quisitor to Clisiocampa americana, 7. — Wheeler, W. M. A study of 

 some Texan Ponerinse, figs., Biological Bulletin, ii, i, Boston, Oct., 1900. 



DEPARTMENT OF EGONOMIG ENTOMOLOBY 



Edited by Prof. JOHN B. SMITH, Sc. D., New Brunswick, N. J. 



Papers for thii department arc solicited. They should be sent to the editor 

 Prof. John B. Smith, Sc.D., New Brunswick, N. J. 



NOTES ON THE OCCURRENCE OF BROOD XX OF THE 



PERIODICAL CICADA, CICADA SEPTENDECIM, 



IN OHIO IN 1900. 



The accompanying map will show the area covered by this brood the 



present year. The supposition, however, has been that it covered nearly 



