MEXICAN SNAKES AND CROCODILIANS — SMITH 



409 



110670), and four at Tacicuaro, Michoacan (Nos. 110666-9). The 

 internasals are lacking in all. All have 7-7 supralabials, 6-6 infra- 

 labials, 1-1 preoculars, 2-2 postoculars, and 1-2 temporals; the pos- 

 terior chin shields are in contact medially in 4, separated in 4; each 

 of these have a single undivided subcaudal scale ; the prefrontals con- 

 tact the labials on one side of one, on both sides of another. Other 

 details are given in table 7. 



Table 7. — Variation in Conopsis nasus 



CONSTRICTOR CONSTRICTOR IMPERATOR (Daudin) 



Thirty-two specimens were secured, as follows : Chiapas : Palenque 

 (Nos. 111285-6) ; Acacoyagna (No. 111288) ; La Esperanza, near 

 Escuintla (No. 111287). Oaxaca: Cerro Arenal (No. 111289); 

 Coyul (No. 111293) ; Salina Cruz (Nos. 111294-311) ; Tehuantepec 

 (Nos. 111290-2). Veracruz: Matacabresto (Nos. 111280-2) ; Potrero 

 Viejo (Nos. 111283-4). 



The Museum has 23 other Mexican specimens, as follows : Chiapas : 

 Huehuetan (No. 46477). Colima: Colima (Nos. 62024, 62074, 

 63846-8) ; Manzanillo (No. 46608). Guerrero: Zacatula River, near 

 Lauria (No. 63851). Michoacan: Nesha Kiver, Sierra Madre (No. 

 62025) ; Chacan River, Sierra Madre (Nos. 62073, 63849-50) ; Plains 

 of Nuroapa, Huroha Volcano (No. 63852). Oaxaca: Tehuantepec 

 (Nos. 30420-1). Sinaloa: Sierra de Choix (No. 46503). Sonora 

 (No. 61956). Veracruz: Mirador (Nos. 6404, 6582); Cordoba (No. 

 30520) ; Santa Maria (No. 46561). Yucatan (No. 11380) : Chichen 

 Itza (No. 46394). I have also examined three others from Chichen 

 Itza, Yucatan, in the Field Museum of Natural History (Nos. 

 26990-2). 



A total of 41 specimens from all localities represei d i 'he above 

 series have been counted, and the number of media dws was 



529454—43 2 



