10 ENTOMOLOGICAL NEWS [Jan., '2O 



The following table will serve to separate the males of the 

 of the eastern species of the otiosus 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 Lee. 



Male with antennae long, slender and ciliate on the posterior side 

 with relatively long hairs crinicornis Horn. 



Agrilus masculinus Horn. Adults were reared on April 14 from the 

 sapwood of dead box elder (Actr negundo) branches collected at Harris- 

 burg, Pa. 



Agrilus defectus Lee. 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 o f 

 the following trees: On July 18, from black oak (Quercus veliilina) col- 

 lected at Manada Gap, Pa.; on May 31, from beech (Fagus amencana) 

 collected at Harrisburg, Pa.; on June 7, from hickory (Hicoria 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 pupal cell. The girdled 

 branch falls in the spring, after which the adult emerges. 



Agrilus vittaticollis Rand. Was found breeding in the living stems 

 of shadbush (Amelanchier 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 gran did enlata) 

 which had been attacked by the poplar borer (Saperda calcarala Say). 



Agrilus cephalicus Lee. Was reared from the sapwood of dead dog- 

 wood (Cornus flonda). This species is often confused with .1. otiosit*, 

 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 triacantlios) collected at New ("umber- 

 land, Pa. 



Agrilus obsoletoguttatus Gory. Was reared from the dead brandies 

 of the following species, collected at Ilnmmdstown Pa.: On June 15, 

 from beech (Fagus americana); on June 2, from blue beech (Curpinits 



