CONTENTS 



343 



PAGE. 



broods depend upon the latitude, 381. There may be eight annual generations in Missis- 

 sippi, 381 . Where the eggs are laid, 383. Of the broods reported in Montgomery county. 

 Pa., 381. Probable cause of the heat observed in the threshed grain, 381. Heat pro- 

 duced in beans by operations of species of Bruchus, 382. Flour made from infested 

 grain decidedly unwholesome, 382. A disease resulting from it, 383. How the insect 

 may be introduced in new localities, 383. The insect occurs occasionally in Canada, and 

 has a large distribution in the United States, 383. It infests portions of Europe, and is 

 injurious in Australia, 383. Bisulphide of carbon the best insecticide for it, 383. Quan- 

 tity to be used, and method of use, 384. Where to order the bisulphide, 384. Import- 

 ance of disinfecting granaries in early summer, 384. Preventives against attack, 384. 

 A severe attack on threshed wheat in Charlottesville, Va., arrested by a mite, 384. The 

 mite identified as Heteropus ventricosus, 385. Illustration of the mite and its history, 



385. Its literature, 386. 



DiPLOSis pyaivoRA, the Pear-Mldge 366 



Where its eggs are deposited, 386. The earliest observation of the larvae on record, 



386. The midge at Blauvelt, N.Y., 387. Steady spread of the insect, 387. Whence in- 

 troduced in New Jersey, 387. Its rapid increase in Mountainville, N. Y., 387. Disap- 

 pearance from Menands, N. Y., 387. Reference to the literature and life-h'story of the 

 insect, 387. 



Notes on Sciara 387 



Citations of some literature of Sciara, 387-389. The genus belongs to the family of 

 Mycetophilidae, or " fungus gnats," 389. They are nearly allied to the Cecidomyidffi, 

 389. Are very numerous in species, 389. Sciara has received little study in this country, 

 389. Of species described by Osten Sacken, probably not a half dozen can be identified, 

 389. The varied larval habits of Sciara, 389. Sources from which species have been 

 reared, 389. A notable species is the " snake-worm," known in Germany as the " Heer- 

 wurm," 390. Several notices of its immense gatherings, 390. The cause for them un- 

 known, and superstitions entertained in regard to them, 390. The species probably 

 Sciara Thomce, 390. The "yellow-fever fly " of the Southern States, 390. Is an unde- 

 scribed species of Sciara, 391. Sciara sp. ? emerging in millions from floor-boards in a 

 seminary in Bethlehem, Pa., 391. Sciara mali or the apple-midge described by Dr. 

 Fitch, as found within an apple, 391 . No subsequent contrlbuti jns to its habits or life- 

 history, 391. Its larval food uncertain, £91. 



Sciara coprophila n . sp , the Manure-Fly 391 



Received from a mushroom cellar in Albany, N. Y., 391 . No evidence that the larvte 

 fed on growing mushrooms, 392. Mention of several European species of "fungus gnats" 

 (Mycetophilidae) which are recorded as "feeding on mushrooms," 393. Some of the 

 species regarded as injurious to cultivated mushrooms, but most are regarded as 

 " scavengers," 392. The Albany Sciara pronounced by Mr. Mead as near the European 

 S. nervosa, 392. Examples sent to Mr. Falconer were Identified as the "manure-fly," 



