1. The larva and pupa of Uranotœnia Lowii, Theobald (Fig 23). Collected from a pool covered with Marsilia polycarpa, Hooker, near the bridge over the Rio Cobre Canal, Spanish Town, Jamaica. Found in association with Culex fatigans, Wied., and Cellia albipes, Theo., January 1st, 1905. Seen in the breeding-jar, the larvæ assumed a horizontal position, just below the surface film the extremity of the siphon alone being in contact with the surface flim. They moved forward in sharp jerks quite unlike any other Jamaican Culicid.