with Prof. F. M. Webstei', who has also reai-ed these two species, 

 as well as a third, and as his views correspond with the writer's, a 

 table has been drawn np. after careful comparison of nearly a 

 hundred examples of the first two species discussed and a lesser 

 number of the third. 



"As a preliminary, it should be stated that the writer fully 

 concurs in the views expressed by Dr. Horn* when he stated that 

 the table furnished at that time, 1878, although founded on 

 color charactei-s, attained 'the object in view as nearly as can 

 be done'; also that the sperics were so variable, even with the sup- 

 pression which he had made, 'as almost to resist generalization'. 

 "The first two forms considered can readily be distinguished 

 by color characters alone, examination of all available ma- 

 terial showing these colors of sufficient constancy to leave no 

 doubt as to the specific identity of a single specimen. More- 

 over, the three species are physiologically distinct, being con- 

 stant within certain limits as regarding habits, 0. liinKiciih/fa 

 having thus far been reared only from canes of rasj^berry 

 and blackberry [E/ihns), 0. trlp/nicfufd from various deciduous 

 trees, including dogwood (Connis) and witch-hazel, while the 

 third species is known only as. inhabiting the elm [U/unis). 

 The three species now under discussion may l)e separated by the 

 aid of the following table: 



A. Ventral surface (including legs and antennte) except 

 thorax, black: abdomen somewhat coarsely and very 

 sparsely punctate, with rather long, black or dark 

 brown pubescence. 



Elytra with black pubescence, disc with prominent 

 carinae, and deeply and closely punctate. 

 Head somewhat strongly and densely punc- 

 tate, with moderately black, brown, or dark yel- 

 low pubescence hhnandnta Oliv. 



AA. Ventral surface (including legs) largely yellow; ab- 

 domen with punctuation feeble, obsolete, or wanting 

 on some segments; pubescence short and pale. 



*Loc. cit. 



