Note 313 — LETTER VI.
Reading edition
Swamm. ii. 81. col. b.—Gyllenhal in describing the last-named species, so common on the flowers of siliquose plants (Insecta Suecica, iii. 142.), asks if his R. sulcicollis (C. Pleurostigma, E. B.), which agrees with it in most respects, except in having toothed thighs, be not the other sex? This query I can solve in the negative, having taken the sexes of R. assimilis in coitu, which do not differ, save that the male has a somewhat shorter rostrum.