The ulna is curved and rather stout; it articulates with both carpal bones; the cubital quills often cause rugosities on its dorsal surface.
This, the stretcher of the cubital quills, is a very interesting muscle.
Arising as a long tendon from the sterno-scapular ligament, it passes the axilla by means of a fibrous pulley, accompanies the axillary vessels and nerves along the humerus, and is inserted by a few fleshy fibres on the base of the last two or three cubital quills.
Quinto-cubital, toes normal.
There are several curved median and cubital nervures and a single anal, but few cross nervures or areolets.
From another hinder trunk arise the two-branched cubital nervure and three separate anal nervures.
2, sub-costal; 3, radial; 4, median; 5, cubital; 6, 7, 8, anal nervures.
II, 12, cubital or branchial; 7.
The main median nervure, and usually also the sub-costal become united with the radial, while the branches of radial, median and cubital nervures pursuing a transverse or recurrent course across the wing, divide its area into a number of areolets or " cells," that are of importance in classification.
The feelers are long and simple, and the wings are very narrow, each with a sub-costal, a radial, a median and a cubital nervure; the branches of the median and the cubital, however, as well as the anal nervures, are vestigial, and there are a few short cross-bars between After Marlatt, Ent.
Cubital trunk, and the zigzag course of many of the branches.