142 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



middle part of the leaflet, about 9 mm. Midrib thin. Secondaries 

 about 6, subopposite, camptodrome pairs diverging from the midrib 

 at wide angles. 



This species is not represented in the present collections. It was 

 compared by Engelhardt with the wide ranging existing species 

 Oaesalpinia pulcherrima Swartz, which extends from the West 

 Indies and Mexico to Brazil and is also recorded from the Galapagos 

 and Sandwich Islands. 



Among the Potosi species the present is very similar in size, outline, 

 and venation to the more elHptical leaflets of Cassia chrysocarpoides 

 Engelhardt. 



CAESALPINIA SESSILIFOLIOroES, new species. 



Plate 16, fig. 15. 



Description. — ^Leaflets small, sessile, markedly inequilateral, ellip- 

 tical in outline, with a rounded slightly mucronate and nearly equi- 

 lateral tip and a broadly rounded inequilateral base. Margins 

 entire, full, and evenly rounded. Leaf substance thin but firm. 

 Length, about 4 mm. Maximmn width, midway between the apex 

 and the base, about 2.75 mm. Midrib thin, conspicuously expanded 

 at the extreme base. Secondaries thin, ascending, camptodrome, 5 

 on the narrower side of the leaflet and 7 on the broader side. The 

 latter side 40 to 50 per cent wider than the opposite side. 



This well-marked species is represented by but a single specunen 

 and there is thus no opportunity of ascertaining its limits of varia- 

 tion. It is almost identical in character with the leaflets of the exist- 

 ing Oaesalpinia sessili^olia of Central America or Oaesalpinia micro- 

 pTiylla De CandoUe of the Brazilian region. It may also be com- 

 pared with the tropical American Oassia rotundifolia Persoon. 



Holotype.— Cat. No. 35127, U.S.N .M. 



Genus CAESALPINITES Saporta. 

 CAESAJLPINITES POTOSIANUS, new species. 



Plate 16, fig. 16. 



Description. — ^Leaflets petiolulate, small, nearly equilateral, oblong- 

 lanceolate in outline, with a rapidly narrowed and bluntly pointed 

 apex and a rounded base. Margins entire. Texture coriaceous. 

 Length ranging from 6 to 8 mm. Maximum width, in the middle 

 part of the leaflet, 1.5 to 2 mm. Petiolule stout, curved, about 

 0.5 mm. in length. Midrib thin, not prominent. Secondaries obso- 

 lete by immersion in the substance of the leaflet. 



This species is represented by several specimens, which on account 

 of the obsolete venation are referred to the form genus Gaesalpinites 

 for generically indeterminate leaflets of the Caesalpiniaceae. These 



