OCR Text |
Show 320 DR. H. GADOW ON EVOLUTION [Mar. 20, rows of tibial plates, both have the posterior border of the formed by complete rows of granular scales, and both have a, long preanal isthmus covered with many small scales. The Rincon . specimen has 17/20, the Balsas specimen 19/18 femoral pores. Consequently both are exceptional, aberrant of their own kind taking on the typical features of the other species. If it were not for the pattern and coloration, which in the Rincon specimen are decisive, the decision would lie with the femoral plates, which in their numbers agree with one, in their extension to the knee with the other species ! CNEMIDOPHORUS GUTTATUS Wiegmann. (Text-figs. 67, 74, & 75.) Material examined 61 specimens, from the following localities 15 Agua fria, western border of State of Vera Cruz. 2 San Juan Evangelista, State of Vera Cruz. 4 La Antigua, near Vera Cruz. 1 " Vera Cruz." 22 typical C. guttatus, all from the Atlantic Tierra Caliente. 1 Salina Cruz* 1 San Mateo del Mar * 4 Tequesixtlan.* 4 San Geronimo*, Isthmus. 4 San Domingo de Guzman *, Isthmus. 4 Cocoyul.* 4 South of and at San Luis Allende. 1 Miahuichan.* 11 Ayutla. 2 Tierra Colorada. 3 South slope of Cajones.* 39 from the Pacific Tierra Caliente. Those marked * are the more typical C. immutabilis. Size, from nose to vent.-Any Guerrero specimen above 100 mm. is a fairly large male; near the Isthmus and in the Atlantic Hot-lands both sexes reach a larger size, and one giant male from San Domingo measures 138 mm. The smallest are those of the inland districts of Guerrero, from Los Cajones to Ayutla and San Luis Allencle. Supraoculars, normally 3, the space behind filled with numerous granules. About 12 to 14 per cent, are exceptional: three specimens out of the four from Tequesixtlan, one with 4/3, another with 4/4, and the third with 5/5, due to an extra rather large scute in front and behind the normal plates. Similar irregularities occur in the typical C. guttatus, for instance from Agua fria, with 3/4 or 4/3. Collar (text-fig. 65 A) as in C. deppei, but the enlarged scales |