188 ENTOMOLOGY FOR MEDICAL OFFICERS 



Ocelli present. Wings always well developed, but always in the 

 female and generally in the male becoming detached, so that 

 only shreds remain which resemble rudimentary wings 



= Lipoptena. 



Ocelli wanting. Wings rudimentary. Legs much enlarged or 



elongated = Allobosca. 



/-Ocelli present. Wings narrow, nearly ten times as long as broad, 



J and longer than the abdomen = Sternopteryx. 



I Ocelli absent. Wings at most three times as long as broad = ri. 



f Wings as long as or longer than the abdomen = Oxypferum. 



1 Wing-rudiments much shorter than the abdomen — - 12. 



Veins of the wings distinct. Asiatic species = Myiophthiria. 



. Veins of the wings indistinct. North American species 



I = Brachypteromyia. 



J 



