THE CANADLA.N ENTOMOLOGIST. 73 



therefore much pleased to capture a pair last summer. The ^ 

 was taken near Rideau Hall on 27 th June ; the ^ on Sparks Street 

 in the centre of the city, on nth July. 



Microclytus gazellula Hald. is also a species belonging to the Middle 

 States, and is given in my Michigan and Buffalo lists. It is an 

 elegant little beetle with the ant-Hke form and movements of 

 Cyrtophorus verrucosus, which it closely resembles. Only three 

 specimens found, on Hickory and on Sumac flowers in July. 



Leptura saucia Lee. This Leptura occurs on flowering shrubs, and is 

 the smallest species which I have taken. It is rare here, and is 

 not given in any of my lists. 



Monohamjnus maculosus Hald. A fine ^ of this species was captured 

 late in September three or four years ago. As it resembles pretty 

 closely the very common beetle, M. confusor, I thought I might 

 have overlooked specimens previously, but a careful watch since 

 then has not revealed any. It is recorded from Lake Superior. 



Goes pulverulentus Hald. This fine insect is rare on Hickory during 

 July. Occurs also at Buffalo. 



Leptostylus parvus Lee. One specimen of this rare beetle. 



Liopus punctatus Hald. Rare, only three captured. Neither this nor 

 the preceding species is included in any lists to which I have 

 referred. 



Saperda mutica Say. On the 15th July, 1882, I captured a pair of these 

 prettily marked beetles on decaying willows. It is recorded from 

 Buffalo. 



(To be Continued.) 



THE SURVIVAL OF THE FITTEST AMONG CERTAIN SPECIES 

 OF PTEROSTICHUS AS DEDUCED FROM THEIR HABITS. 



BY JOHN HAMILTON, ALLEGHENY, PA. 



The ultimate extinction of many species of Coleoptera in the vicinity 

 of large cities is unquestionable, especially of the larger Carabidae. The 

 conditions of life with some are such as admit of no adaptation to the 

 methods of civilization, and for them no refuge from the encroachments 

 of agriculture will eventually remain. They are now retiring, retiring, and 



