10 ENTOMOLOGICAL NEWS [Jan., ’20 
The following table will serve to separate the males of the 
of the eastern species of the ofiosus group. 
Tibiae of male on all three pairs of feet mucronate at the inner apical angle. 
Male pubescent on the median line of under side........ otiosus Say. 
Male not pubescent on the median line of under side. 
Male with the sides of the genitalia nearly parallel at apex, flared in 
middle, sides sparsely punctate.................. juglandis n. sp. 
Male with sides of genitalia flared near apex, sides densely punctate. 
frosti n. sp. 
Male with the last ventral truncate and fimbriate...... defectus Lec. 
Male with antennae long, slender and ciliate on the posterior side 
witherelativelyslonashalrs errr > ere eer crinicornis Horn. 
Agrilus masculinus Horn. Adults were reared on April 14 from the 
sapwood of dead box elder (Acer negundo) branches collected at Harris- 
burg, Pa. 
Agrilus defectus Lec. On May 29, adults of this species were reared 
from the dead branches of white oak (Quercus alba) collected at Hummels- 
town, Pa. 
Agrilus arcuatus Say. Adults were reared from girdled branches of 
the following trees: On July 18, from black oak (Quercus velutina) col- 
lected at Manada Gap, Pa.; on May 31, from beech (Fagus americana) 
collected at Harrisburg, Pa.; on June 7, from hickory (Hzcoria ovata) 
collected at Hummelstown, Pa. The egg seems to be laid on a small 
twig, where it hatches and the small larva enters the bark, working its 
way down the cambium to the branch. Later the branch is girdled and 
the larva, still in the girdled part, travels from one to six inches from point 
of girdling, where it enters the wood and forms a pupalcell. The girdled 
branch falls in the spring, after which the adult emerges. 
Agrilus vittaticollis Rand. Was found breeding in the living stems 
of shadbush (A melanchier canadensis) at Dauphin, Pa. 
Agrilus bilineatus Web. Breeds in oak and chestnut, often causing 
the death of unhealthy trees. 
Agrilus anxius Gory. Breeds in various species of birch. At Speece- 
ville, Pa., it was found to be killing the poplars (Populus grandidentata) 
which had been attacked by the poplar borer (Saperda calcarata Say). 
Agrilus cephalicus Lec. Was reared from the sapwood of dead dog- 
wood (Cornus florida). This species is often confused with A. otiosus, 
but can easily be separated by the tarsal claws. 
Agrilus politus Say. Breeds in living willow and striped maple (Acer 
pennsylvanicum). 
Agrilus fallax Say. Adults were reared by Mr. H. B. Kirk, from dead 
branches of honey locust (Gleditsia triacanthos) collected at New Cumber- 
land, Pa. 
Agrilus obsoletoguttatus Gory. Was reared from the dead branches 
of the following species, collected at Hummelstown Pa.: On June 15, 
from beech (Fagus americana); on June 2, from blue beech (Carpinus 
