PARASITIC DIPTERA. 3L)1 



except a broad triangle whose apex reaches the hind mar- 

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

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

 brownish. Wings cinereous hyaline. Length, 2 mm. 



Two specimens, labelled "Emerged from gypsy moth 

 pupa3, 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 referi'ing the species to Elachiptera ( Crassiseta) , 

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



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

 Brookings, South Dakota (reared from Cimhex urnericana). 



Notwithstanding the difference of locality and hal)its, 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 ha^'e 

 the projecting abdominal segment as described, and in the 

 first weak vein of the wings, 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 l)y Aldrich. Otherwise the species may 

 be briefly descril^ed as follows : — 



Mcde. — Head black, antenn;e fuscous ; palpi yellow, with 

 black l)ristles ; proboscis yellow. Thorax black. Abdomen 

 black ; halteres light yellow. Front and middle legs yellow, 

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

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

 hyaline ; second heavy vein (third longitudinal) furcate ; 

 bristles on costal border lono-. Leno-th, 1.5 mm. 



It is prol)al)ly true that the species of Pliora 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 living insect. 



The following list of the European Dipterous parasites 

 of the gypsy moth has been compiled from various sources. 



