PARASITIC DIPTERA. 



391 



except a broad triangle whose apex reaches the hind mar- 

 gin, and all of the following segments, black. Legs light 

 yellow; the front tibise and tarsi brown, the other tarsi 

 brownish. Wings cinereous hyaline. Length, 2 mm. 



Two specimens, labelled Emerged from gypsy moth 

 pupee, Aug. 21, 1891." The arista has been broken away 

 in both specimens, save the basal part ; this part, however, 

 is so thickened and pubescent that I believe that I am not 

 in error in referring the species to Elacliiptera (^Crassisetct) ^ 

 where it finds its nearest ally in E. eunota Loew. 



Pliora setacea Aldrich, Can. Ent., Vol. 24, page 144, 

 Brookings, South Dakota (reared from Oimhex americanci). 



Notwithstanding the difierence of locality and habits, I 

 believe that the specimens bred from the gypsy moth par- 

 asitic material and sent to me by Professor Fernald are of 

 the same species as those described by Professor Aldrich. 

 I have only males, and it is possible that the females may 

 show some discrepancies. The specimens differ from the 

 description only in the male genitalia, which do not have 

 the projecting abdominal segment as described, and in the 

 first weak vein of the wdngs, which is distinctly curved and 

 not *' almost straight." The species will be best recognized 

 by the arrangement of the lowermost frontal bristles, for 

 the position of which the reader is referred to the figure and 

 description given by Aldrich. Otherwise the species may 

 be briefly described as follows : — 



Male. — Head black, antennae fuscous ; palpi yellow, with 

 black bristles ; proboscis yellow. Thorax black. Abdomen 

 black ; halter es light yellow. Front and middle legs yellow, 

 the hind ones more brownish. One spur at the tip of the 

 tibiae, save of the front pair, where there are none. Wings 

 hyaline ; second heavy vein (third longitudinal) furcate ; 

 bristles on costal border long. Lengih, 1.5 mm. 



It is probably true that the species of PJiora are not truly 

 parasitic, but live in any dead or decayed material that 

 comes in their way ; still, it is not certain but that they may 

 attack the livino- insect. 



o 



The following list of the European Dipterous parasites 

 of the gypsy moth has been compiled from various sources. 



