REPORT OF THE STATE ENTOMOLOGIST 97 



PAOB. 



species conld not be identified, 243. Character of the injury to cabhage, 



243. Six thousand punctureH to the square inch, 243. Subsequently 

 identified as having been injurious to onions, 243. Its erroneous refer- 

 ence to Limothrips tritici, 243. Observed also in England, 243. In Colo- 

 rado described as a new species, 243. Finally recognized as Thripa 

 tabaci, of Europe, 244. Probably an old introduction in this country, 



244. Occurs on various food-plants, 244. Serious injuries to the 

 onion crop, 244. Only recently known to attack cabbage, 244. List of 

 its known food-plants, 244. Distribution of the insect, 245. Its descrip- 

 tion, 245. The eggs and larvae, as observed by Dr. Lindeman, 246. Its 

 life-period, 246. Brief life of the imago, 246. The three generations, 246. 

 Osborn-Mally on the placing of the eggs, 246. Hibernation of the in- 

 sect, 246. Remedies for it, 247. Some characters of the Thripidse, 247. 

 Difficulty attending their classification, 247. Formerly believed to be 

 harmless insects, of carnivorous habits, 247. Many found to be destruc- 

 tive to plants, 247. Partial Literature of the Thripidse, 247-250. 



ScHOTURUS NivicoLA, the Snow Flea 251 



Bibliography, 251. Possible unreliable references, 251. The genera 

 Achorutes and Schotui-us, 251. At Ghent, X. Y., on trunks of pear trees, 

 251. Classification of the Poduridse, 252. Their leaping apparatus, 252. 

 Another distinctive feature, 252. Reference to descriptions of S, nivi- 

 cola, 252. 



Achorutes diversiceps 253 



A Podurid observed at Center, N. Y., 253. Its extraordinary numbers, 

 253. Found to be an uudescribed species, 253. Its description and 

 illustrations, 253. Original note relating to the insect, 254. 



Tyroglyphus heteromorphus, a Carnation Mite 254 



Death of carnations in a greenhouse in Berlin, Mass, 254. A Tyro- 

 glyphus mite and eel-worms found in all of the affected plants, 255. A 

 Gamasus miti' also associated, 255. The Tyroglyphus mite lives on the 

 decaying material of the roots, 255. The mites observed for a long time 

 in confinement, 255. They fed on a fungus developed upon the carnation 

 roots, 255. Believed also to feed on infusoria associated with them, 255. 

 Thought to injure living tissue of carnations, 255. Assumed a Hypoj>u3 

 form in confinement, 256. Five well-defined forms during development, 



256. The young six-legged form, 256. The larger Hypopus, 256. Trans- 

 formation of a female, 256. The smaller Hypopus, 256. A form assumed 

 by immature mites, 256. The Hypopus a puzzle to naturalists, 257. 

 Different opinions respecting it, 257. Claparede's studies, 257. M<5g- 

 nin's later observations, 257. The relation of Hypopus to Tyroglyphus, 



257. The carnation mite believed to be uudescribed, 258. Its descrip- 



