THE FLIES THAT CAUSE MYIASES IX MAN 



35 



In all species treated in this work, the arista is plumose above and 

 below for more than half its length, though not to the apex (except 

 Wohlfahrtia, in which it is only short-pubescent) : the eyes are bare: 

 the mouth parts are well developed, but the proboscis is never excep- 

 tionally long as it is in some of the Larvaevoridae ; the face is concave 

 in profile and is never strongly receding, its length at the vibrissae 

 being much more than half, often fully, that at the antennae: the 

 epistoma is warped forward: the vibrissae are well differentiated: the 

 parafacials are hairy: and the intermediate abdominal segments are 

 without discal bristles. 



KEY TO GENERA 



The following key will be useful in helping to distinguish adults of 

 the three genera treated in this publication; it must, however, be kept 

 in mind that there are many others in this family. 



1. Arista short-pubescent (rig. 8. B i : abdomen with constant markings which 



are independent of the light incidence 



Wohlfahrtia Braner and Bergenstamni 

 Arista short- to long-plumose: abdomen with changeable pollinose 

 patterns 2 



2. Arista short-plumose < fii- r . 8. C) : scutellum with a mat of dense pile on 



each side toward the base, below the level of the lateral bristles. Some 

 other genera not considered in this work ( e. g., Agria) have the short- 

 plumose arista but lack the characteristic lateral hair patches 



Titanogrypha Townsend 

 Arista long-plumose (fig. 8, A I : scutellum without mats of dense pile 

 as described above Sarcophaga Meigen 



Figuke 8. — Antenna : A. 



Sarcophaga bullata; B. 

 Titanogrypha alata. 



Wohlfahrtia magnifica; C, 



The Genus WOHLFAHRTIA Brauer and Bergenstamni 



This genus includes medium-sized Sarcophagidae, usually 10-15 

 mm. in length. The abdomen lacks the tessellated or changing checker- 

 board appearance of the more typical Sarcophagidae. On the con- 

 trary, except in one Chinese species, it is gray, with characteristic 

 constant black spots in three longitudinal series: these spots may be 

 small and confined to the apical halves of the segments, or. as in 

 W. vigil, they may fuse strongly, so that the abdomen may appear 

 mainly black. The larger size, coupled with the characteristic abdomi- 

 nal markings, will in general serve to distinguish this genus from other 

 members of the family. 



