200 Table of Contenjs 



PAOS. 



Pyrrharctia ISABELLA, the Black-and-red Woolly-Bear 225 



Bibliography of the species, 225. Not a serious insect pest, 225. 

 Information of the caterpillars asked, 225. Traveling habit of the 

 caterpillar, 226. Figures of the insect, 226. Description of the 

 caterpillar, 226. Its means of defense, 227. Its hibernation, 227. 

 An unusual number of moltings, 227. Transformations of the 

 insect, 227. Description of the moth, 227. Food of the caterpillar, 



228. Its natural enemies, 228. 



Helophilus latifrons — one of the Syrphus flies 228 



Its bibliography, 228. Appearance and mode of flight of the 

 Syrphidge, 229. Mimicry of other insects, 229. Little known of 

 their early stages, 229. Dr. Williston's monograph of the family, 



229. Correction of an erroneous specific determination, 230. . Dif- 

 ference between H. similis and H. latifrons, 230. The "rat-tail" 

 larvge of H. latifrons found in a water-tank, 230. The mature 

 larvae, 231. Their pupation, 231. Account by Dr. Morey of their 

 habitat, movements in the water, and place of pupation, 231. 

 Erroneous habits ascribed to the larvae, 232. The perfect insect, 

 233. Its distribution, 233. Apparently rare in New York, 233. Not 

 an injurious species, 233. The Syrphidse, except a few, are not 

 harmful, 233. The corn-feeding Syrphus fly one of the exceptions, 

 233. 



Ohloropisca prolifica, the Prolific Chlorops 234 



Eeference to notices of it, 234. Entering dwelling-houses for 

 hibernation, 234. Where first observed, 234. Eemarkable gather- 

 ings of allied species recorded in Europe, 235. Interest excited by 

 these gatherings, 235. Speculations concerning them, 235. Only 

 three known localities for the fly in the United States, 235. 

 Kecently appearing at Ausable Forks, N. Y., 235. Its first appear- 

 ance as described by Mrs. Graves, 236. Observed within doors, 

 236. Not controllable by Pyrethrum powder, 236. Their immense 

 number, 236. Seeking new quarters, 236. Some of their annoying 

 habits, 236. They arrive in three companies, 237. Effort to destroy 

 them, 237. No other house visited by them, 237. Manner.of arrival 

 in summer and departure in spring, 237. Features of special 

 interest in the fly, 238. Where does the insect breed ? 238. Sur- 

 roundings of the infested house, 238. Probability that the breeding 



