TWO ASIATIC MUSCOID FLIES PARASITIC UPON THE 

 SO-CALLED JAPANESE BEETLE. 



By J. M. Aldrich, 



Associate Curator, Division of Insects, United States National Museum. 



The two species of parasitic flies described below were both reared 

 by J. L. King, of the United States Bureau of Entomology, Depart- 

 ment of Agriculture, in the course of investigations in Japan upon 

 the so-called Japanese beetle {Popillia japonica Newman), which 

 has been introduced into the United States and has become a serious 

 pest near Philadelphia, Pennsylvania. 



OCHROMEIGENIA ORMIOroES Townsend. 



Ochromeigenia ormiaides Townsend, Proc. U. S. Nat. Mus., vol. 56, p. 578, 1919. 



This species now proves to be widespread and probably of con- 

 siderable economic importance in the oriental region and north- 

 ward to Japan. It is therefore deemed advisable to give a fuller 

 description of the generic and specific characters than was con- 

 tained in the reference cited above. 



Genus OCHROMEIGENIA Townsend. 



Front in profile long and straight. The antennae attached at the 

 level of the middle of the eye, face mode*-ately receding, a little 

 protuberant at the vibrissae; the bucca slightly over a fourth of 

 the eye-height, but ascending in its anterior portion so that the 

 front edge of the mouth is considerably above the lower edge of 

 the head ; back of head moderately bulging below ; antennae reach- 

 ing about three-fourths of the way to the vibrissae, the third joint 

 twice as long as the second; the arista with slight pubescence ex- 

 tending to the tip ; facial ridges low, not convei:gent below, without 

 hairs except close to the vibrissae. Front narrow in the male, some- 

 what wider in the female. Ocellar and vertical bristles very small 

 in the male ; f rontals small except above, about 8 in number, extend- 

 ing to the base of the second antennal joint. In both females 

 the bristles of the top of the head, are rubbed off, but apparently 



No. 2474.— Proceedings U. S. National Museum, Vol. 63. Art. 6. 



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