PROC. ENT. SOC. WASH., VOL. 22, NO. I, JAX., 1920 5 



the bark of Fa gits silvaticus, September 30, 1S95, Dyrehaven, 

 Denmark. 



Phloeonemus catenulatus Horn. 



Larva. -Similar to Aulonituii but slightly more depressed; antennae and 

 palpi more slender; mandibles having brush of hairs on molar part; carina 

 on terga less pronounced and more regular; eighth and ninth terga not 

 strongly chitinized, latter bearing cerci as figure; spiracles having bifore 

 lobes much larger. 



Described from specimens in the U. S. Nat. Museum, labeled 

 587 Beeville, Texas, November, 1895. These were collected by 

 E. A. Schwartz in the gum exuding from scars on mesquite trees. 



Synchita fuliginosa Melsh. 



Larva. Form elongate, subcylindrical, having slight dorsal and ventral 

 ampullar protuberances, each bearing a lateral and transverse impression; 

 maximum length, 6 mm.; integument white, not chitinized, sparsely clothed 

 with long, slender hairs. Ninth tergum projecting in a single recurved 

 cercus bifurcated at the apex ; pre- and post-hypopleural chitinizations of 

 thorax line-like and very faint; otherwise essentially as Aitlonium except 

 that the terga do not bear the transverse carina. 



Described from specimens, Hopk. U. S. No. 9709. 



These larvae have always been found under bark associated 

 with fungous growth. They are very common in cankers of the 

 chestnut bark disease (Endothia) feeding on the deteriorating bark 

 or fungus mycelium. The adults eat the conidial threads. 



Synchita sp. 



Larva. Distinguished from .S". full gin ami by the more slender and more 

 strongly recurved cerci. 



Pupa. Essentially as Ditoma but having the pronotum wider in front 

 and regularly beset around the anterior and lateral margins with small finely 

 setose papillae. Setae of body very fine; last tergum bearing two conical, 

 widely separated, erect, projecting, but slightly chitinized points. 



Descriptions from specimens, Hopk. U. S. No. 10083t. They 

 were collected at East Falls Church, Va., under the bark of a 

 dead spruce log, associated with a white mouldy growth. The 

 adult has not been specifically determined. 



Nematidium nlliforme Lee. 



Larva. -Form very elongate cylindrical; largest specimen 12 mm. long, 



by 1 mm. wide; integument thin, rather thickly beset with short stiff hairs. 



Head elongate-oval, strongly chitinized; labrum circular; front triangular; 



