636 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



The larvae are predaceous on the larvae of small woodborers, the 

 larvae of gallmakers, and on the larvae of insects inhabiting the 

 pith of annual plants. 



HYDNOCERA UNIFASCIATA Say. 



Tryon, North Carolina. Larvae from galleries of Hyperplatys 

 in sumac. W. F. Fiske. 



HYDNOCERA VERTICALIS Say. 



Harrisburg, Pennsylvania. Larvae reared from Celastrus infested, 

 with Cerambycidae. F. C. Craighead. Lyme, Connecticut, Hydno- 

 cera larvae apparently predaceous on Phymxitodes amoenics in wild 

 grape. Champlain. 



HYDNOCERA TABIDA LeConte. 



East Falls Church, Virginia. Hydnocera pupae in stems of annual 

 plant infested with Mordellid larvae. Champlain. 



Genus XENODOSUS Wolcott. 



XENODOSUS SANGUINEUS Say. 



Adults collected at night on oak bark near base of tree, June, 

 July. Adults collected in winter months at base of oak. Pennsyl- 

 vania, Connecticut. Champlain. 



Camp Caribou, Maine, May 28. Adults on bark of spruce trees 

 dead and dying from attack of Dendroctonus piceaperda. June 7, 

 adult on spruce infested with Polygraphus (placed living Poly- 

 graphus in bottle with it, which it at once attacked and slowly killed 

 by biting at base of prothorax.) Webster Springs, West Virginia, 

 June 20. Adult on decaying wound in living beech. 



Waterville, New Hampshire, May 2. Adult under loose bark of 

 large dead white pine. Observations by A. D. Hopkins. 



Genus PHYLLOBAENUS Spinola. 



PHYLLOBAENUS DISLOCATUS Say. 



Is a predator on small Scolytoids and other small borers. Adults 

 observed feeding on Pityophthorus attacking red oak. Are active 

 during daytime, April to August. They may be found on and flying 

 about infested trees where they feed, mate, and oviposit. 



The larvae are to be found in the larval mines of small wood and 

 bark borers, where they prey upon the borer broods. They are 

 predaceous on Elaphidion villosum in oak twigs; Chramesus icoriae 

 in hickoi-y twigs ; Micracis in redbud ; Seolytus mutica and Agrilus 

 lecontei in hackberi*y; and will probably attack almost any small 

 borers in deciduous trees. 



Probably occurs in most of the eastern half of the United States, 

 southwest to Texas. 



Observations by Hopkins, Fiske, Craighead, Kirk, Champlain. 



