The CANADLA.N ENTOMOLOGIST. 



(not obtuse), its much less robust and posteriorly attenuated form, and 

 by the more or less impressed last ventral segment of the $ ; obtusus is 

 much more sparsely clothed. There are other minor differences, but the 

 above suffice to show that it is not in harmony with any of the species 

 mentioned. From a mixed lot of nasicus its separation requires an 

 examination of the femoral tooth in every individual, but mixed with the 

 other two, simple inspection will suffice in the most of cases. 



It is quite probable other species of Balaniniis remain to be dis- 

 covered, only one species of which is known from the Pacific Coast. A 

 very pleasant and certain way to determine this would be for collectors 

 everywhere to rear them from nuts and acorns and publish the results. 

 Other modes of collecting are not to be relied on, as for example, in 

 twenty years collecting here I only took nasicus and obtusus, and in chest- 

 nut lime rectus, but all this time all the other species (caryce probably 

 included) were sufficiently abundant. 



DISTRIBUTION. 



B. proboscoideus. — Middle States westward, Horn ; Massachusetts, 

 Blanchard ; Tennessee, Illinois, District of Columbia, Ulke ; Ohio, West 

 Virginia, Pennsylvania. 



B. rectus. — Middle and Southern States, Horn ; Arizona, Smith ; 

 District of Columbia, Virginia, Ulke ; Canada, New York, Massachusetts, 

 Pennsylvania, Ohio, West Virginia. 



B. quercus. — Illinois, District of Columbia, Ulke ; New York, New 

 Jersey, Pennsylvania, West Virginia, Ohio. 



B. nasicics. — Canada to Georgia, and westward to Colorado and New 

 Mexico. 



B. caryce.. — Illinois, Ulke ; Indiana, Levette ; Kansas (Douglas Co.), 

 Snow ; Pennsylvania, Klages. 



B. uniforviis. — Canada to Florida, from the Atlantic to the Pacific. 



B. obtusus. — Massachusetts, New Hampshire, Blanchard ; Texas, 

 Nebraska, Horn ; Ohio, Pennsylvania, West Virginia. 



Undescribed form. — Massachusetts, North Carolina, Blanchard ; 

 Pennsylvania (Lancaster Co., Auxer; Westmoreland Co., Klages). 



Balaninus has a single parasite common to all the species, except 

 that it was not reared from obtusus ; the larva was not observed while 

 living in that of Balcininus, but it forms a tough papery cocoon so thin 



