76 THE CANADIAN ENTOMOLOGIST. 



for, should they disappear for a time, re-colonization by river transportation 

 can scarcely fail to occur. 



13. P. corvinus Dej. The mature insect is found under rubbish and 

 decaying vegetation in and around swampy places. The larvse live in the 

 swamp and may be found full grown about the beginning of June. They 

 are entirely luteus except the mandibles, which are brown and very 

 powerful. The head is as large as the first thoracic segment, and the out- 

 line of the larva is fusiform. Each abdominal segment has at the sides 

 three long appendages. As there are only a few swampy places in this 

 vicinity, and these all susceptible to drainage, extuiction is a matter of 

 course. 



14. P. purptcratus Lee. This handsome species is common here, 

 though generally it must be rare, being always in demand. Its habitat is 

 plateaus on hill-sides and along the base of rugged elevations, where there 

 is a dry light soil and some low vegetation, as Nepeta glechoma, Steilaria, 

 Claytonia, Dielytra Ca?iadensis, etc. Agriculture is its enemy, and its 

 beauty will induce the beetle hunters of the future to pursue it to exter- 

 mination in the few places to which it must finally retreat. Alcohol 

 changes the purple of its elytra to black. 



15. P. mutus Say will survive. It seems to be a progressive insect; 

 though preferring its native woods, it is becoming, so to speak, domesti- 

 cated, gradually accommodating itself to cultivated places. There is a 

 marked difference between those bred in fields, for, presumably, four or 

 five years, and those taken in their native haunts. The former are on the 

 average larger, have the base of the thorax more coarsely and densely 

 punctured, and the elytra more deeply striate and less polished. So 

 different in appearance are the extremes, that, by destroying intermediate 

 forms, they might be separated into species. 



16. P. erythropus Dej. is a hardy species, though not very abundant; 

 and, as it inhabits in high or low ground, whether cultivated or in a state 

 of nature, it is likely to be long a surviver. The individuals found here 

 have the feet piceous black, while those of New Jersey and Massachusetts 

 have them bright ferruginous, the typical color ; otherwise no difference is 

 observable. 



The sixteen species above mentioned are all of the genus now occur- 

 ring here. Their survival in this Fauna, as deduced from the foregoing, 

 may be thus summed up. Four must soon become extinct. Six may 



