X. FAMILY 



BY PROF. v. i,. KEXIOGG. 



Fig. 46. Bibiocephala elegantula, enlarged. After Kellogg. 



Moderate-sized, elongate, bare species with long legs 

 and broad wings. Eyes usually dichoptic in both sexes, 

 but occasionally holoptic in one or both sexes ; eyes of 

 both sexes usually bisected by a line or narrow unfacet- 

 ted space, with the two fields composed of larger and 

 smaller ommatidia (indicated by larger and smaller cor- 

 neal facts), in a few species the eyes bisected only in one 



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