Where the geographic ranges of the two species approach one another the only taxonomically significant difference detected by us is in size, _C. leuconotus_ being larger than _C. mesoleucus_. Other characters that are useful in separating the two alleged species now are known to vary geographically in a fashion that indicates only subspecific status for the two kinds. For example, three specimens from Laredo, Texas (previously recorded by V. Bailey, N. Amer. Fauna, 25:205, October 24, 1905--Nos. 24839/32237, 24840/32238 and 24842/32245 USBS), bridge the gap in color pattern between _C. l. texensis_ to the east and _C. m. mearnsi_ to the west. _C. l. texensis_ characteristically has the white stripe terminating anteriorly in an obtuse angle, and on the hinder back the area of white is restricted to a narrow line or is wanting. _C. m. mearnsi_ characteristically has the white stripe truncate anteriorly and approximately as broad on the hinder back as on the shoulders. In the specimens from Laredo, the young female, No. 24842, has the white nearly truncate anteriorly (pointed in the other two specimens, adult females). In No. 24839 the area of white on the hinder back is only slightly restricted in width (noticeably restricted but present in the other two specimens). The proof of intergradation, or the lack of it, between the two alleged species, _Conepatus mearnsi_ and _Conepatus leuconotus_, would seem to be profitably sought by obtaining specimens along the Rio Grande in Texas between the Blocker Ranch ("50 miles southeast of Eagle Pass") and Laredo. Measurements illustrating the size difference between the two alleged species are as follows: TABLE 1. Measurements of _Conepatus_ from Texas Column Heading Legend: Col. A: [Male] ad. 186455 USNM, Mason, Texas. Type Col. B: [Male] ad. 31970/24575 USBS, Blocker Ranch, Texas Col. C: [Female] ad. 126241 USBS, 8 mi. S Langtry, Texas Col. D: [Male] ad. 47122 USBS, Brownsville, Texas. Type Col. E: [Male] ad. 45132/33129 USBS, Brownsville, Texas Col. F: [Male] yg. 45900/33865 USBS, Brownsville, Texas Col. G: [Female] ad. 47121/34865 USBS, Brownsville, Texas Col. H: [Female] ad. 24839/32237 USBS, Laredo, Texas Col. I: [Female] ad. 24840/32328 USBS, Laredo, Texas Col. J: [Male]? sad. 16651 AMNH, Kingsville, Texas