The first basal wing cell (between veins L3 and L4) is compressed almost out of existence, and veins L3 and L4 continue parallel and close together to the wing margin. The wing is therefore narrow and pointed. The postvertical and posterior scutellar bristles are frequently missing. The eyes are small, rough and narrowly oval. The penetrance of the phenotype is complete. Viability is imperfect.
RK2.
Bateman, 1950.