12 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
shown in the limited material collected, although all of the forms 
collected at this locality are maceration resisting forms. Length 
about 6 cm. Maximum width, about midway between the apex 
and the base, about 1.85 em. One side of the lamina full below and 
narrowed above, the opposite side narrowed below and full above. 
Maximum difference in width of the two sides about 2 mm., but 
this is no measure of the marked inequilateral appearance of these 
leaflets. Midrib curved and prominent, not stout except proximad 
where it expands abruptly to the sessile base. Secondaries well 
marked, of medium size and prominence, seven regularly curved 
camptodrome ones in the broader half of the lamina; six in the 
narrower half, the basal of which are straight and ascending, the 
distal of which are more curved and camptodrome like those of the 
opposite side. Tertiaries thin, largely percurrent. 
This distinct type shows very conclusively the foliar features of 
an Inga, many species of which genus have been recognized in recent 
years in the warmer Tertiary floras of the Western Hemisphere. 
The present species is not particularly close to any of these, but is, 
on the other hand, very similar to several Central American and 
northern South American existing forms. The genus is a large one 
to which new species are being constantly added. The latest pub- 
lished enumeration * lists 9 species from Mexico, and their variety 
increases southward, 14 being listed from Panama and Colombia, 
29 from Peru, and 66 from Brazil. The genus, although present, 
is much more sparingly represented in the Antilles than on the 
mainland. The known fossil Miocene species of this general region 
comprise one from Colombia, one from Panama,” one from Costa 
Rica,’® and one from the Dominican Republic.” 
Occurrence.—1} km. west of the telegraph station San Jose del 
Carmen, State of Vera Cruz. 
Holotype.—Cat. No. 36821, U.S. N. M. 
Family PAPILIONACEAE. 
Genus DIOCLEA Humboldt, Bonpland, and Knuth. 
DIOCLEA (7?) MEXICANA, new species. 
Plate 1, fig. 4. 
Leaflets broadly lanceolate in outline; widest in the middle or 
slightly below the middle; slightly more tapering distad than proxi- 
mad; about equally acute at both ends. Margins entire, full and 
13 Pittier, H., Cont. U.S. Nat. Herb., vol. 18, pt. 5, 1916. 
14 Engelhardt, H., Abh. Senck. Naturf. Gesell., vol. 19, p. 36, pl. 8, figs. 1, 2; pl. 9, fig. 8, 1895. 
18 Berry, E. W., U.S. Nat. Mus. Bull. 103, p. 32, pl. 16, fig. 2, 1918. 
16 Berry, E. W., Proc. U.S! Nat. Mus., vol. 59, p. 174, pl. 25, fig. 2, 1921. 
17 Idem., p. 120, pl. 21, fig. 11. 
