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Cincinnati Society of Natural History, 



mentioned is hardly recognizable, mine being so much 

 brighter, and they do not very closely resemble Lemonias 

 cytherea, being of a different color and having fewer white 

 spots on the upper surface. 



C. DIPTERA. 



Mallophora orcina Weid. In a field near Hyde Park this 

 powerful "robber fly " was very abundant from June to Octo- 

 ber, 1899. Its favorite victims were hymenopterous insects, 

 mostly honey bees. I have several specimens taken in the 

 act of killing bumblebees, larger than themselves ; seventy 

 specimens collected. 



D. COLEOPTERA. 



Leptura emarginata Fabricius. On July 2, 1899, I found a 

 dead beech stub, about one foot in diameter and ten feet high, 

 which was perforated with many round holes, from which 

 these rare beetles had emerged. One of them was taken in 

 the act of crawling out. I had only seen a single specimen 

 before in many years' collecting. 



Sandalus niger Knoch. This beetle has always been rare 

 here. Five or six specimens only had been taken in many 

 years. Five years ago, Mr. Thiel observed many of them 

 crawling up and down the trunks of some ash trees (Fraxinus 

 americana) in one of the parks. Each year he visited the 

 place at the same date (in September), but never saw any 

 more until September, 1899, when they were again abundant. 

 September 27, 1899, I removed the sod under these trees and 

 found many circular holes from which Sandalus had emerged. 

 The holes were perfectly round; those for the females were 

 of larger size. I took a mature male and female each from a 

 burrow as they were in the act of emerging. I found no 

 larvae. All had seemingly pupated quite deeply in the ground. 

 When they hatch they dig to the surface of the ground and 

 emerge. Many of the larger branches of the trees are dead, 

 caused, perhaps, by the work of this beetle on their rootlets. 



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