J. R. .MALLOCH 305 



hairs, which are not confined to margin but invade the cheek 

 itself, and the bristles adjoining the vibrissa hair-like and not 

 very numerous. 



It is probable that this species will require to be placed in a 

 new genus, but comparison of both sexes of the species involved 

 is necessary to permit of a decision on this point, and only the 

 male of depressa is available to me at this time. 



HYLEMYIA 1{.-D. 



I have dropped the very unsatisfactory genus Phorbia in this 

 paper, because no separation of genera can be based upon the 

 very unstable character of the hairing of the arista. If we accept 

 the presence or absence of hairs on the arista as the distinguishing 

 character for these and other anthomyiid genera, we undoubtedly 

 obtain results which are neither satisfactory nor in agreement 

 with natural relationships. 



All the species I have described in this and other papers, and 

 those already described or recorded by Stein from North America, 

 have been incorporated in a key which I have in manuscript and 

 hope to publish when I complete working over the material now 

 on hand. 



Hylemyia antiqua Mcigen 



1826. Anlhomyia antiqua Meigcn, Sys. Beschr'., v, 166. 



There are four females in the collection which agree with speci- 

 mens of this common, widely distributed species before me which 

 were bred from onions near Chicago, Illinois. 



Locality; San Francisco, California, (F. E. BlaisdcU), one speci- 

 men, May 27, 1908, three specimens, August 7, 1908. 



Hylemyia fracta sp. n. 



Male. — Black, slightly shining. Head black, interfrontalia, anterior half 

 of parafacials, and the upper anterior portion of cheeks rufous; face, cheeks, 

 and orbits with white pniincscence; antennae and palpi black. Thoracic 

 dorsum with slight whitish pruinescence, which is most distinct on lateral mar- 

 gins, and l)etween the acrostichals and dorso-centrals anteriorly; pleura 

 whitish pruinosc. Abdomen rather densely whitish pruinescent, less pro- 

 nouncedly so on posterior margin, each segment with a central black stripe, and 

 the anterior margin black. Legs black. Wings clear, veins black. Calyptra 

 white, margins yellowish. Halteres yellow. 



Eyes separated by a little more than width of anterior ocellus; antennae 

 distinctly shorter than face, third joint one and one-half times as long as 

 second; arista with microscopic pubescence; parafacial in i)r(iril(' liroade"- t'-an 



TRANS. AM. ENT. SOC, XLIV. 



