. Catalogue of the neotropical Squamata. Squamata; Reptiles. KEY TO THE GENERA OF LIZARDS AND AMPHISBAENlANS^ 1, At least one pair of limbs present, although may be very reduced 2 No trace of limbs externally 5 2. Venter covered either with large, squarish, juxtaposed, plate-like scales or with large, smooth, imbricate, cycloid scales 3 Venter covered either with numerous small, rounded or pointed, imbricate or subimbricate scales, either smooth or keeled, or with very small, granular scales 8 g. Large number of scales on dorsum of head, most either knobby or granular in appearance , 4 Scales
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. Catalogue of the neotropical Squamata. Squamata; Reptiles. KEY TO THE GENERA OF LIZARDS AND AMPHISBAENlANS^ 1, At least one pair of limbs present, although may be very reduced 2 No trace of limbs externally 5 2. Venter covered either with large, squarish, juxtaposed, plate-like scales or with large, smooth, imbricate, cycloid scales 3 Venter covered either with numerous small, rounded or pointed, imbricate or subimbricate scales, either smooth or keeled, or with very small, granular scales 8 g. Large number of scales on dorsum of head, most either knobby or granular in appearance , 4 Scales on dorsum of head large and plate-like, few in numbei 5 4. Third and fourth digits on hind limb equal or subequal in length; no enlarged supraocular scales Heloderma Fourth digit of hind limb considerably longer than third; several enlarged, plate-like supraocular scales Xenosaurus 5. Fewer than two pairs of scales between rostral and first median unpaired scale on head (Figs. 2, 3) 6 Two or more pairs of scales following rostral before first median unpaired scale on head (Fig. 1) 14 1. Por lo menos con un par de extremidades, aunque pueden estar muy reducidas 2 Sin trazas de extremidades externamente 5 2. Vientre cubierto de escamas grandes, cuadradas, yuxtapuestas, laminares o bien de escamas cicloides, grandes, lisas, imbricadas 3 Vientre cubierto de numerosas escamas chicas, redondeadas o puntudas, imbricadas o subimbri- cadas, lisas o guilladas, o bien de escamas muy chicas granulares 8 3. Gran número de escamas en dorso de la cabeza, la mayoría de aspecto granular o nudoso ^ Escamas del dorso de la cabeza grandes y lami- nares, en número reducido 5 4. Longitud de tercer y cuarto dedos de extremidad posterior igual o casi igual; sin escamas supra oculares di la tadas Heloderma Cuarto dedo de extremidad posterior considera- blemente más largo que el tercero; varias escamas supraoculares dilatadas, laminares Xenosaurus 5» Menos de dos pares de escamas entre rostral y pr