34 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



Sida rhombifolia, 

 Pachira aquatica. 

 Quararibea pterocalyx. 

 Eschzveilera panatnensis. 

 Eschweilcra rcversa. 

 Gustavia nana. 

 Gustaz'ia parvifolia. 

 Combretum coccineum. 

 Combretum epiphyticum. 

 Combretum punctulatum. 

 Aciotis purpurascens. 

 Clidemia dentata. 

 Clidemia pctxolaris. 

 CoHostcgia speciosa. 

 Conostcgia subcrustulata. 

 Lcandra cinnaniotnea. 

 Leandra mcxicana. 

 Miconia barbinervis. 

 Miconia nervosa. 

 Oxymeris cinnamomea. 

 Oxymeris heterobasis. 



Sagraa petiolata. 

 Styrax argenteum. 

 Mimusops daricnsis. 

 Malouetia panamensis. 

 Enallagma cucurbitina. 

 Jacaranda copaia. 

 Macfadyena uncinata, 

 Aphelandra sinclairiana. 

 Aphelandra tetragona. 

 Diodia radula. 

 Cassitpa panamensis. 

 Macrocnemum glabrcsccns. 

 Morinda panamensis. 

 Psychotria magna. 

 Rustia ferruginea. 

 Rustia occidcntalis. 

 Watsonamra gymnopoda. 

 Watsonamra macrophylla. 

 Watsonamra magnifica. 

 IVatsonamra pittieri. 

 IVatsonamra pubescens. 



ARID LOWER TROPICAL ZONE 



The Arid Lower Tropical Zone extends in a belt of .varying width, 

 niainly at low elevations, all along the southern side of the Isthmus, 

 excepting possibly the extreme southeastern part, from the Pacific 

 coast line to near the base of the higher mountains, reaching farthest 

 inland along the valley of the Tuyra River and at the base of the 

 Azuero Peninsula. In the vicinity of the Canal Zone it crosses the 

 continental divide and invades a part of the valley of the Qiagres 

 River ; important islands off the coast are also included in its scope. 



The total rainfall is by no means scanty, and in the wet season the 

 forested parts of this zone differ little in appearance from Humid 

 Lower Tropical areas, truly arid conditions prevailing only during 

 the dry season when much of the forest, except near water, is leafless 

 and the contrast with the continuously humid areas is very striking. 

 A number of trees exhibit the strange habit of devoting the wet 

 season to purely vegetative functions ; under the stimulation of the 

 first rains newly formed leaves and rapidly lengthening branches 

 give the forest a spring-like appearance, but the flowering and 

 maturing of fruit is deferred until the dry season, when the leaves 

 have fallen and general growth has stopped. 



Mammals of Arid Loivcr Tropical Zone 



Didelphis marsupialis particeps, San Miguel 

 Island Opossum (San Miguel Island"). 



Didelphis marsupialis battyi, Batty's Opos- 

 sum (Coiba Island). 



y^armosa mexicana sazannarum. Savanna 

 Marmosa. 



Marmosa fulviventer, Fulvous-bellied Mar- 

 mosa (San Miguel Island). 



Philander laniger pallidus. Pale Woolly 

 Opossum. 



Philander laniger nauticus. Insular Woolly 

 Opossum. 



Odocoilcus chiriquensis, (Tbiriqui White- 

 tailed Deer. 



Odocoilcus rothschildi, Rothschild's White- 

 tailed Deer (Coiba Island). 



