238 NORTH AMERICAN ANTHOMYIID FLIES OF GENUS PHAONIA 



Dendrophaonia querceti (Bouche) 



Anthomyia querceti Bouche, Naturgesch. d. Ins., i, p. 82, 1834. 



I have seen only one male of this species from America, taken 

 at White Heath, Illinois. 



I have a female taken at Gold Rock, Ontario, Canada, which 

 may belong to a different species, having the hypopleura bare 

 and the hind tibia with only the calcar on that surface, but do 

 not describe it as I have insufficient material to warrant that 

 course. 



Dendrophaonia hilariformis (Stein) 



Spilogaster hilariformis Stein, Berl. Ent. Zeitschr., 1897, p. 196. 



This species is very common on tree trunks at Urbana, Ilhnois, 

 but it is so alert that it is difficult to catch. I reared a series of 

 specimens from larvae found feeding in a much decayed tree 

 stump, in March 1915, at Urbana. 



The adults habitually frequent the trunks of trees and sit 

 normally head downwards, harmonising well with the bark and 

 are very wary. The species is well distributed throughout the 

 eastern United States, occurring as far south as Plummer's 

 Island, Maryland, to my knowledge, but is rare in collections, 

 possibly because of its habits. 



The larva has six or seven branches to each prothoracic res- 

 piratory organ. These are very distinct in the puparium, 

 l:)eing white, and are larger than those of Phaonia harti. The 

 cephalic extremity of the puparium has many concentric ridges 

 surrounding the mouth-opening. Metathoracic spiracles pedun- 

 culate, about four times as high as thick. Surface of puparium 

 more distinctly striate than that of harti and the elevated points 

 on the ventral transverse band larger. On each side of the 

 anal opening in puparium there is a small circular button-like 

 mark. Anal spiracles slightly elevated, their vertical length 

 greater than their horizontal, the distance l^etwecn them equal 

 to their greatest length. Spiracular slits not radiating, each 

 directed upward and outward, the central button distinct. 



The larvae may ])e ])redaceous but I have no evidence of this. 

 They were found along with the larvae of A^codexiopsis basalts 

 (Stein) and evinced no prcdaceous tendencies in the brooding 

 dish. 



