EXPLANATION OF THE PLATES. 



PLATE I. 



Costa Rica Batrachia, natural size, excepting figs. 8a, 9a, and 13a, which are twice natural size. 

 Fig. 1. Cranopsis fastidiosus ; la, mouth. Page 96. 



2. Grepidius epioticus; 2a, mouth. Page 97. 



3. Ollolis ccerulescens; 3a, mouth. Page 98. 



4. Bufo auritus. Page 99. 



5. Bufo coccifer. Page 100. 



6. Dendrobates talamancse. Page 102. 



7. Hyla nigripes. Page 104. 



8. Phyllobates hylseformis ; 8a, mouth. Page 107. 



9. Lithodytes podiciferus ; var. D. Page 108. 



10. Lithodytes melanostictus ; 10a, mouth. Page 109. 



11. Lithodytes megacephalus ; 11a, mouth. Page 110. 



12. Tryptheropsis chrysoprasinus ; 12a, mouth. Page 114. 



PLATE II. 



Fig. 1. Anolis insignis; one-half natural size. Page 120. 



2. Anolis microlus ; one-half natural size. Page 119. 



3. Anolis pachy pus ; natural size. Page 122. 



4. Anolis oxylophus; natural size. Page 123. 



5. Ghalcidolepis melallicus ; natural size. Page 116. 



PLATE III. 



Fig. 1. Basiliscus plumifrons, natural size; la, head from above. Page 125. 

 2. Basiliscus mitralus; head from above, natural size. Page 127. 



PLATE IV. 



Fig. 1. Dendophidium melanlropis. Page 134. 



2. Dryophis breviroslris. Page 132. 



3. Hyla elfeochroa ; 3a, mouth. Page 105. 



4. Hylodes cerasinus ; 3a, mouth. Page 112. 



PLATE V. 



Fig. 1. Leptognathus argus, natural size. Page 130. 



2. Teleiiraspis schlegelii, natural size. Page 149. 



3. Bothriopsis proboscideus, natural size. Page 150. 



4. Hyla uranochroa, natural size. Page 103. 



PLATE VI. 



Heads of Lacertilia and Ophidia, natural size, except figs. 2 and 4. 

 Fig. 1. Mabuia alliacea, from above. Page 115. 



2. Ghalcidolepis metallicus; a, above; b, below; twice natural size. Page 116. 



3. Amiva gabbiana ; a, above; 6, below. Page 117. 



4. A nolis trochilus, above; twice natural size. Page 121. 



5. Anolis oxylophus, above. Page 123. 



6. Xiphosoma annulatum: in this and the following figures, the superior view is marked 



a, the lateral b. Page 129. 



7. Leptognathus argus (a). Page 130. 



8. Leptognathus pictivenlris (a and b). Page 130. 



9. Leptophis seruginosus (a and b). Page 132. 



10. Leptophis saturatus (a and b). Page 133. 



11. Spilotes chrysobronchus (a and b). Page 136. 



12. Contia calligasler (a and b). Page 146. 



13. Bothriopsis proboscideus (a) . Page 150. 



Note.— In the Catalogue of Ophidia given on page 95, the species Golobognathus nasalis and 

 Colophrys rhodogaster should be for the present omitted, as they occur in the adjoining State of Nica- 

 ragua. 



