Memoirs of the National Academy of Sciences . d Arabic numerals for theirbranches, is very convenient. Spuler divides the wings of each pair into an outspread portion [Spreitentheil) and a foldedpart [Faltentheil). The Aeins of the former area he numbers in the same manner as Redtenbacher,beginning on the costal edge of the wing, while those of the folded area (the subnjediau andinternal or first and second anal veins of other authors) he does not name, but simply numberswith the Greek letters a fi. He considers that Hagen was right in believing the Phryganida,TipulariiB, and some Microlepidop
Memoirs of the National Academy of Sciences . d Arabic numerals for theirbranches, is very convenient. Spuler divides the wings of each pair into an outspread portion [Spreitentheil) and a foldedpart [Faltentheil). The Aeins of the former area he numbers in the same manner as Redtenbacher,beginning on the costal edge of the wing, while those of the folded area (the subnjediau andinternal or first and second anal veins of other authors) he does not name, but simply numberswith the Greek letters a fi. He considers that Hagen was right in believing the Phryganida,TipulariiB, and some Microlepidoptera to be forms with a schematic, i. e., primitive venation(Stettin. Ent. Zeit., p. .SIC, 1870). Spuler shares the opinion of Fritz Miiller (Termitida?), Brauer and Eedtenbacher (Libellulidre),and Haase (Papilionida), that the costa is only a hypodermal structure, a thickening of the edge,which does not have a trachea as its origin (Anlage), and which therefore has nothing to do withthe veins. MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 85.
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