1920] Johnson — The Female of Glutoj)s Singularis Burgess 153 



nute vestiges of wings, the structure of the thorax is not affected, 

 suggesting that the loss of wings is not due to parasitism of any 

 kind, but that it is a normal condition, and that the male sex of 

 the species is truly dimorphic. 



I have referred this species to the genus Cephalonomia, although 

 the female is without w^ngs and has large ocelli. Kieffer^ refers 

 all wingless females with ocelli, 12- jointed antennae and non- 

 spinous tibiae to Bethylus ( = Perisemus). In the present species, 

 however, the portions of the thorax are fully developed as in the 

 winged forms of Cephalonomia, which have ocelli, and the tarsal 

 claws are simple as in Cephalonomia, not bifid as in Bethylus. 



THE FEMALE OF GLUTOPS SINGULARIS BURGESS. 



By Charles W. Johnson, 



Boston Society of Natural History. 



A female of this rare fly was taken by the writer along the "Red 

 Cross Trail," on Mt. Monadnock, N. H., June 10, 1920, at an ele- 

 vation of about 1,800 feet. It has not been described, and as it 

 differs considerably from the male, seems to warrant a description. 



The bluish-gray coloring of the entire insect is noticeably lighter 

 and the hairs of the face, thorax and abdomen about one-third the 

 length of those of the male, antennae yellow, the hairs on the first 

 and second joints about one-third the length of those on the male, 

 outer half of the annuli black, and the hairs on the palpi much 

 shorter. Front slightly wider than the width of each eye, flat, with 

 numerous short, black hairs, except at the lower angles and above 

 the base of the antennae, ocelligerous tubercle prominent, ocelli 

 shining black, occiput more protruding than in the male, and the 

 hairs about one-third as long. The vertical angle is obsolete and 

 the area below is not depressed as in the male, but protruding, 

 with narrow depressions on each side extending toward the margin 

 below the inner corners of the eyes. The rounded facial promi- 

 nences are not as "conical" as in the male, and are separated 

 by the width of the base of the antennae. On each side of the an- 

 tennae extend deep furrows diverging towards the mouth, forming a 

 rounded, elevated epistoma, with a narrow contracted area above 



» Gen. Ins., fasc. 76, p. 16 (1908). 



