156 ANNALS OF SCOTTISH NATURAL HISTORY 



antennae very short, third orbicular with a naked dorsal 

 seta ; vertex broad in both sexes, somewhat narrower in the 

 male and gradually widened towards the front ; thorax a 

 little broader behind than in front ; abdomen broadly oval, 

 almost round, rounded at the apex in both sexes, and without 

 projecting ovipositor in the female. Wings with the fourth 

 longitudinal vein bent upwards towards the third at a right 

 angle, forming an apical transverse vein, but not uniting with 

 the third, the straight portion prolonged slightly beyond the 

 angle ; apical transverse strongly curved inwards towards 

 the base of the wing ; discal transverse joining the fourth 

 longitudinal at some distance behind the origin of the apical 

 transverse. 



The sexes in this genus are difficult to distinguish, owing 

 to the ovipositor not projecting in the female. Brauer points 

 out, however, that some clue is afforded by the shape of the 

 eyes. Seen from the front, the inner margin of each eye in 

 the female appears distinctly angled, that is to say, it 

 descends vertically about half way and then turns abruptly 

 outwards ; in the male the same margin seen from the front 

 is straight and inclined outwards the whole way. 



Cephenomyia may be readily distinguished from Gaslro- 

 pJnliis by the inflexion of the fourth longitudinal vein of the 

 wings ; from Hypoderina by the prolongation of this vein 

 beyond the origin of the apical transverse vein, by the 

 position of the discal transverse vein, which in Hypodenna 

 joins the fourth longitudinal immediately at its angle, 

 and especially by the absence of the dividing ridge in the 

 concavity of the face. From (Estrus it differs in the apical 

 transverse vein not uniting with the third longitudinal ; and 

 from Pharyngomyia in the body being more uniformly 

 coloured, never checkered, but densely clothed with hairs. 



Cephcnouiyia rufibarbis (Meigen) is a large fly, measuring 

 nearly three-quarters of an inch in length. Head black, 

 clothed behind with tawny hairs and a ring of black hairs 

 behind the eyes ; vertex with black hairs and a median line 

 of yellowish-gray hairs ; face between the eyes and in the 

 cavity silvery ; checks with a beautiful bright tawny beard. 

 Antennae dark reddish brown, with brown seta. Thorax 

 with five not very distinct naked lines, otherwise densely 



