PITTIER—MIDDLE AMERICAN SPECIES OF LONCHOCARPUS. 47 
sively to the semiarid Pacific coast, which can consequently be consid- 
ered the main endemic center. Of the species reported from the Pacific 
slopes and coast, 13 belong to the subgenus Eulonchocarpus and 9 to 
Neuroscapha. Of the former, all the species of the section Spongop- 
teri seem to have originated along this coast, 3 of them (peninsularis, 
nicoyensis, and costaricensis) being apparently localized in the 
peninsula of Nicoya and its immediate surroundings, and 2 (erio- 
carinalis and jaliscensis) in the tierra caliente of western Mexico. 
Even making due allowance for our imperfect knowledge of the 
distribution of the several species, it can be definitely stated that 
most of them have very limited areas of dispersion, even within 
Middle America. Excluding velutinus, latifolius, atropurpureus, 
and sericeus, which we have found already to extend beyond our 
limits, we find that only one of the 36 remaining species is found on 
both sides of the isthmus of Tehuantepec, which, in the geographic 
and floristic sense, separates Mexico from Central America. . This is 
guatemalensis, which extends along the Pacific coast from southern 
Mexico to Costa Rica, and reaches also the Atlantic watershed in the 
semiarid districts of western Guatemala. Our knowledge of the 
distribution of the other species is mostly limited to the type locality, 
which points either to an extreme splitting of species, which I refuse 
to admit, or toa remarkable localization of type. The latter hypoth- 
esis is corroborated by the localism of other well known species of 
the West Indies, as for instance, benthamianus, restricted to the 
Leeward Islands. 
Distribution of the Middle American species of Lonchocarpus. 
Neotropical province. S| ¢4 
Xero- o % 
ahing Central bs E 
Prowmee Mexico. America. 4s s 
Species arranged by groups. u1|sfis gj 
=| a als 
g/2/2 glele/212/8)< 
B/2/2/3/8/3/2/5)/8)/3 
ale j/aial/alal/eil2/;E I] se 
EULONCHOCARPUS. 
1. Philenopteri. 
1. ‘Osus . a eee eee wweeenlenee| XK [eee] K | XK 
2. velutinus.. a aes cccccee cece a a nd Pe > al >: 4 x 
3. affinis.................2. a ES Ga DO OO DO 
2. Spongopteri. | 
4. peninsularis............../....)..../-.../..--/..-.| & |...-/----)--2-/eeee 
5. Micoyensis ...............)..../..../..--|.---]----| & |. 
6. costaricensis............. as a Pee en Ds 
7. eriocarinalis ............ weee[eee-/----] & weeele 
8. jaliscensis............... KX l...]....| & 
3. Punctati. 
9. longipedicellatus........ ae Pe Pe en DO i 
10. michelianus......-.....--J..../..../....]....)..--| X 
11. longistylus.............. re a a ee en DO 
12. chiricanus.............. wecaleceeleeecleeecleeeel KX |. 
13. p roteranthus.............)....)....)....)....]....] & |. 
