Note 309 — LETTER XXXVIII.
Reading edition
Mr. B. Clark thinks that he has discovered spiracles in this larva in the usual situation, (Essay on the Bots, &c. 48. t. ii. f. 3.) but they are probably analogous to the spiraculiform tubercles of Œ. Ovis. Reaum. iv. 566. t. xxxv. 17-19. t. Vallisnieri (Esperienz. &c. 136) notices them.