In Jamaica there seem to be at least two species of _Acrocomia_, the larger of which is called the “great macaw” palm, and is described as having a fusiform trunk as thick as a man’s body. What is presumably the same species occurs in Cuba as shown by a photograph from the vicinity of La Gloria on the north coast. The greatest diameter of the trunk is three or four times the thickness near the base. In Puerto Rico no trees approximating these proportions were observed, the greatest amount of swelling probably not reaching twice the diameter below. According to Maza _Acrocomia lasiospatha_ grows wild in Cuba and is known under the name “coroja de Jamaica.” Swartz described his _Cocos fusiformis_ on the supposition that it was distinct from the _Cocos aculeatus_ of Jacquin, from Martinique, by reason of the fusiform trunk. The species was, nevertheless, reduced by Martius to his South American _Acrocomia sclerocarpa_, perhaps because the spathe is said to be spiny, a character probably subject to great variation. Jacquin’s name _Acrocomia aculeata_ (1763) must, it seems, be used for the West Indian palm placed by Martius under his _A. sclerocarpa_, which is to be maintained, if at all, as a South American species. Jacquin declares that the habit of his tree is similar to that of _Cocos nucifera_ and _Cocos amara_ (_Syagrus_), and his figure shows a tall straight trunk tapering slightly upward, with no tendency to bulge. The spines of the trunk are few and the midribs are aculeate on both sides. The drawing of the fruit is 37 mm. long by 41 mm. wide and has a broad conic papilla at apex. As indicated above, such a tree was not noticed in Puerto Rico where all the corozo palms are distinctly, though slightly, thicker some distance above the base, though apparently never equaling _A. fusiformis_ in this respect. Subfamily COCINAE Key to the Genera of Cocinae Trunk distinctly ringed, rising from an inclined swollen base; leaves numerous, many of the lower drooping or pendant, the divisions many and narrow; fruits very large, borne continuously. COCOS. Trunk nearly smooth, straight and columnar; leaves fewer, not becoming pendant, divisions less numerous and broader; fruits small, borne at one time and ripening together. COCOPS. COCOS NUCIFERA Linn. Sp. Pl. 1188. 1753