. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 1. The ilium in three kinds of Iguanidae: (A) Sauromalus obesus, UIMNH 33236; (B) Dipsosaura dorsalis, UIMNH 33235; and (C) Iguana delkatisiima, MCZ 82305. The line equals one centimeter in each example. anterior iliac process is rather weakly de- veloped (see Fig. 1). In Ctenosaura, Conolophus, and Ambhj- rhynchus, the basisphenoid is constricted behind the basipterygoid processes (see Etheridge, 1964: 68, for details and quanti- fication ). Brachylophus and Cyclura are very close to Iguana. Etheridge (in lift
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 1. The ilium in three kinds of Iguanidae: (A) Sauromalus obesus, UIMNH 33236; (B) Dipsosaura dorsalis, UIMNH 33235; and (C) Iguana delkatisiima, MCZ 82305. The line equals one centimeter in each example. anterior iliac process is rather weakly de- veloped (see Fig. 1). In Ctenosaura, Conolophus, and Ambhj- rhynchus, the basisphenoid is constricted behind the basipterygoid processes (see Etheridge, 1964: 68, for details and quanti- fication ). Brachylophus and Cyclura are very close to Iguana. Etheridge (in lift.) has provided the following distinctions: Brachylophus has no secondary coracoid fenestra; Cyclura has high, finlike processes above the neural arches of all the caudal verte- brae. I question the value of these generic distinctions. Boulenger (1885) recognized two species of Iguana: tuberculata and delicatissima, both of Laurenti (1768); he also recognized rhinolopha Wiegmann (1834) as a variety of tuberculata. Dunn (1934) essentially agreed. He placed Iguana iguana (=tuber- culata) under its correct name, maintained /. delicatissima as a distinct species, and 7. i. rhinolopha as a subspecies of I. iguana. Dunn's remarks on the distributions of the three foniis are confused and contradictory, but his classification has remained stan- dard; there are only two species in the genus. The allocation of each of the names is not clear from the descriptions given by Linnaeus (1758) and Laurenti (1768), respectively, but Boulenger's (1885) al- locations have never been challenged to my knowledge, and are accepted here. The type locality for the two species given by both their authors is Indiis; this is properly translated as "The Indies" (not "India," cf. Cuvier, 1829), and is thus quite correct. Both species form a con- spicuous part of the fauna of the Lesser Antilles. The two species are extremely similar (see Comparisons, below). Many supposed distinctions bet
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