The C-band, or costal band, extends from the base of the wing along the anterior margin to the apex of vein R1. The S-band extends obliquely from the base of cell cu1 across r-m, reaching the anterior wing margin in cell r1, then following the anterior margin to the wing apex. When the C-band and S-bands are connected along veins R2+3 or R4+5, they are usually separated along the costa by a basomarginal hyaline spot in cell r1, immediately distal to the apex of vein R1.
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