ule, 
~ swollen; they never interrupt cross-veins, and only exceptionally a 
end in a re-entering angle, but, on the contrary, often cause at 
the end bayings-out of the wing-margin. ee 
Redtenbacher defines five fields in the fully-developed wing of 
an insect. These are (1) the costal field, with the costa; (2) 
radial field, with the radius and its numerous sectors; (3) a: 
field of the fifth vein, or the medial field; (4) the cubital field, 
with the cubitus; and (5) the anal field. He also proposes 3 d 
uniform nomenclature for the venation in all of the orders. | © 
systems of convex veins running in the several fields are at , 
nated by the successive odd Roman figures,—#é., those of ti 
ih, Hip IH; If, as is frequently the case, conca® 
veins appear between the branches of a convex trunk, 
designated by the Roman numerals of the convex 
stone” Il; 
thus, a concave vein between III, and III, is indicated y inl 
+ ul o 
Eai 
