Note 734 — LETTER XII.
Reading edition
Not having ever met with another specimen, I am unable to say of what precise species of aphidivorous fly it is the larva, nor can I find a figure of it, though it approaches near to one given by De Geer (vi. t. 7. f. 1-3). Its shape is oblong-oval, length about four lines, and colour pale red speckled with black. Each of the seven or eight segments which compose the body projects on each side into three serrated flat aculei or teeth; three or four similar but smaller aculei arm the head: and two, much larger than the rest, the anus, one on each side of the usual bifid protuberance which bears the respiratory plates. A bifid tubercular elevation is also placed in the middle of the back of each segment.