Ocyptamus (Calostigma) elnora (Shannon)  

Shannon described a new genus, Calostigma, for species with straight and upright vein M1 and the apical macula in the wing. These species are small, mostly polished flies with head hemispherical, circular in outline (frontal view), face projecting beyond antennal prominence; front unusually narrow; ocelli well advanced of occipital margin; eye nearly bordering onto oral margin; posterior oral region yellow; dorsum of thorax bounded by a yellow vitta; katatergum yellow; abdomen constricted basally; terga 3, 4 and 5 each with five longitudinal yellow vittae; post angular section of vein M1 straight and joining vein R4+5 at right angles; a conspicuous dark spot at tip of wing (Shannon 1927).