492 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ss 



Cruz Blanca, five have 6-7 or fewer infralabials ; two from Toxtla- 

 cuaya, Veracruz, have 7-7 infralabials ; these seem typical intergrades. 

 Another series of 35 specimens is from El Limon Totalco, Veracruz ; 

 20 have 6-7 infralabials or less, the remainder 7-7 or 7-8; these are 

 apparently intergrades not only of I. lineata and I. wetmorei, but also 

 with I. acuta, since some specimens have the large dorsal spots of that 

 race. Others (18) from between Las Vigas and La Jolla, Veracruz, 

 are intermediate between I. wetmorei and I. lineata, with 6-7 or 6-6 

 infralabials occurring in 12, 7-7 or more in 6. Thirty-three specimens 

 from Distrito Federal and eastern Mexico also appear intermediate 

 between these races; 15 have 67 or fewer infralabials. The area of 

 intergradation of I. lineata is therefore of considerable extent, from 

 Distrito Federal east to western Veracruz. 



Remarks. — This Veracruzian race is named for Dr. Alexander Wet- 

 more in reference to his studies of the avifauna of that state and in 

 appreciation of the many courtesies extended to my wife and me dur- 

 ing my tenure of the Walter Rathbone Bacon Scholarship. 



TRIMORPHODON BISCUTATUS BISCUTATUS (Dunveril and Bibron) 



Trimorphodon biscutatus Hscutatus Smith, Proc. U. S. Nat. Mus., vol. 91, pp. 

 159-160 (part), 1941. 



Seven specimens were secured, one in the state of Chiapas (Tonala, 

 No. 110409), the others in the state of Oaxaca (Tres Cruces, No. 

 110403-4; Tehuantepec, Nos. 110405-6; Cerro Guengola, No. 110407; 

 La Conception, No. 110408). 



The Museum has five other specimens, from Tehuantepec, Oaxaca 

 (Nos. 30406, 30427-9), and Santa Efigenia, Oaxaca (No. 46547). 



TRIMORPHODON BISCUTATUS SEMIRUTUS, new subspecies 



Type.— U. S. N. M. No. 110410, from Acapulco, Guerrero. 



Paratypes. — Nine in the EHT-HMS collection, including Nos. 

 5338-9, El Sabino, Michoacan ; Nos. 5145-8, Agua del Obispo, Guer- 

 rero; No. 4588, near Organos, Guerrero; No. 21404, La Crucita, Guer- 

 rero; and No. 23619, 10 miles north of Tafetan, Michoacan. Also 

 U. M. M. Z. No. 80200, 6 miles northwest of Villa Alvarez, Colima, and 

 No. 80201, Las Ortices, Colima. 



Diagnosis. — Like Trimorphodon oiscutatus oiscutatus, except ven- 

 trals 260 to 275, caudals 85 to 102, total ventral-caudal count 358 to 

 376, as compared with 251 to 271 ventrals, 81 to 96 caudals, total 

 ventral-caudal counts 343 to 359 of the typical subspecies. 



Description of type. — Male: scale rows 23-24-16; ventrals 275; anal 

 divided; caudals 100; supralabials 8-9; infralabials 11-12; preoculars 



