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. 
o.—All three pairs of tibiae mucronate on the inner side. 
2 .—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 autho: 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. masculinus, 
but according to Dr. Horn’s key* it should be placed next 
to A. otiosus. It has been confused with A. ofiosus 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 virginiana) 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. Amer. 
Ent. Soc., V. 18, p. 277-336, 1891. 
