8 ENTOMOLOGICAL' NEWS [Jan., '20 



cleft, the lower portion turned inward, nearly touching that of the opposite 

 side, claws on all three pairs of feet in both sexes similar. Length 55 mm.; 

 width I mm. 



cf. 'All three pairs of tibiae mucronate on the inner side. 



9 . Only anterior and middle tibiae mucronate on the inner side. 



Described from a large series of adults, most of which were 

 beaten from the foliage of butternut (Juglans cinerea). Type 

 collected by the authoi at Hummelstown, Pa., June 9, on 

 butternut. Allotype reared from the outer bark of living 

 butternut (Juglans cinerea) collected at Linglestown, Pa., 

 by the author. Both types in the author's collection. 



The beetle breeds in the outer bark of living butternut 



(Juglans cinerea}. The injury made by the larva makes the 



tree susceptible to attack of other insects and Chrysobothris 



femorata Fab. and Chrysobothris sexsignata Say are often 



found working together with the above species. 



In the vicinity of Hummelstown, Pa., the pupal stage was 

 observed on May 15, and the first adults appeared about 

 May 25. Mr. Champlain states that the beetle causes con- 

 siderable damage to the butternut in the vicinity of Lyme, 

 Connecticut. 



In general appearance this species resembles A. masculimis, 

 but according to Dr. Horn's key* it should be placed next 

 to A. otiosus. It has been confused with A. otiosus in col- 

 lections, but the males can easily be separated from the males 

 of this species by the lack of the median line of pubescence 

 on the ventral surface. 



Agrilus otiosus Say. Hickory seems to be the common host-plant 

 of this species, although on June 5 adults were reared from a dead branch 

 of persimmon (Diospyros mrginiana) collected at Rockville, Pennsylvania. 



Agrilus frosti n. sp. 



Form of A. otiosus. Antennae greenish; reaching beyond the middle 

 of the prothorax, serrate from the fourth joint; head convex, densely 

 punctate, becoming strigose on occiput. 



Prothorax wider than long, narrowed at the base, sides feebly arcuate, 

 more strongly in the female, lateral margin sinuate, hind angles of male 

 faintly carinate, carina sometimes nearly obliterated in the female; disk 



* G. H. Horn. The Species of Agrilus of Boreal America, Trans. AHHT. 

 Knl. Soc., V. 1 8, p. 277-336, 1891. 



