CHECKLIST OF THE SNAKES OF MEXICO . 45 



Genotype. — Conopsis nasus Giinther. 



Range. — Central Mexico, from soutliern Chihuahua to central 

 Michoacan, eastward to southern central San Luis Potosi, and ISIorelos. 

 Species. — Two. 



KEY TO SPECIES OF CONOPSIS 



1. Internasals absent, rarely indicated ; dorsal pattern consisting of a distinct 

 median row of dark spots; venter with paired or irregularly arranged 

 dark spots ; caudals in males 30 to 38, average 33 (92.2 percent less than 



37), in females 22 to 31, average 25 (95.1 percent less than 28) nasus 



Internasals present, rarely absent; dorsal pattern not consisting of a 

 median row of spots, but typically of two paravertebral rows, the spots 

 of which are sometimes expanded laterally to give a somewhat cross- 

 banded effect ; venter spotted or not ; caudals 30 to 41, average 38.6, in 

 males (7.4 percent less than 37), 27 to 34, average 30.5, in females 

 (7.7 percent less than 28) biserialis 



CONOPSIS BISERIALIS Taylor and Smith 



Conopsis Mserialis Taylob and Smith, Univ. Kansas Sci. Bull., vol. 28, 1942, 

 pp. 333-337, figs. 2, 3, 11 (map), pi. 31, fig. 1, pi. 35, fig. 9. 



Type.—E. H. Taylor-H. M. Smith Coll. No. 23648. 



Type locality. — Ten miles west of Villa Victoria, Mexico. 



Range. — An area in the southwestern part of the central Mexican 

 plateau, from southern Distrito Federal west to eastern Michoacan 

 (recorded from Distrito Federal and the states of Morelos, Mexico, 

 and Michoacan). 



CONOPSIS NASUS Gfinther 



Conopsis nasus Gxjnther, Catalogue of the snakes in the British Museum, 1858, 



p. 6.— Tayloe and Smith, Univ. Kansas Sci. Bull., vol. 28, 1942, pp. 329-332, 



figs. 1, 11 (map), pi. 30, figs. 2, 3, pi. 32, figs. 2-4, pi. 35, fig. 4. 

 Oxyrhina {Exorhina) maculata Jan, Arch. Zool. Anat. Fis., vol. 2, 1862, pp. 60-61 



( type locality, Mexico ; cotypes in Milan, Paris, and Vienna Mus., and the 



Westphal collection in Montpellier). 

 Epirhina tessellata Jan, ibid., pp. 62-63 (type locality, Mexico; type in Milan 



Mus.). 

 Conopsis nasus heliae Terbon, Anal. Inst. Biol. Mex., vol. 1, 1930, pp. 175-176, 



fig. 1 (type localit3', San Luis Potosi, San Luis Potosi; type presumably in 



Institute de Biologia, Mexico City). 



Type.— Brit. Mus. Nat. Hist. 



Type locality. — Unknown ("California," by error). 



Range. — Plateau of central Mexico from southern Chihuahua to 

 central Michoacan, eastward to southern central San Luis Potosi, and 

 Distrito Federal (recorded from numerous localities in Distrito 

 Federal and the states of Chihuahua, Durango, Guanajuato, Jalisco, 

 Mexico, Michoacan, San Luis Potosi, and Zacatecas). 



5S4960 — 45 4 



