Table 1.—Analysis of Variation in Adults of Four Subspecies of Baiomys Musculus (measurements in millimeters)
| Number of adults averaged | Total length | Length of body | Length of tail | Length of hind foot | Upper molar length (alveolar) |
| Baiomys musculus handleyi, | |||||
|---|---|---|---|---|---|
| Sacapulas, El Quiché, Guatemala | |||||
| 9 Av | 121.44 | 70.77 | 50.67 | 15.33 | 3.48 |
| Max | 128.00 | 77.00 | 54.00 | 16.00 | 3.60 |
| Min | 115.00 | 66.00 | 49.00 | 15.00 | 3.40 |
| 2xStand. error | 3.60 | 3.22 | 1.26 | .44 | .05 |
| Baiomys musculus pullus, | |||||
| 8 mi. S Condega, Nicaragua | |||||
| 17 Av | 117.29 | 70.42 | 47.18 | 15.47 | 3.13 |
| Max | 121.00 | 74.00 | 50.00 | 17.00 | 3.20 |
| Min | 111.00 | 66.00 | 44.00 | 14.00 | 3.00 |
| 2xStand. error | 1.27 | 1.51 | .75 | .35 | .03 |
| Baiomys musculus grisescens, | |||||
| Comayaguela, Honduras | |||||
| 7 Av | 103.71 | 59.00 | 44.71 | 14.57 | 3.31 |
| Max | 118.00 | 68.00 | 50.00 | 15.00 | 3.40 |
| Min | 97.00 | 51.00 | 42.00 | 13.00 | 3.20 |
| 2xStand. error | 5.50 | 4.16 | 2.40 | .78 | .06 |
| Baiomys musculus nigrescens, | |||||
| Valley of Comitán | |||||
| 11 Av | 115.00 | 72.09 | 42.91 | 15.31 | 3.15 |
| Max | 120.00 | 77.00 | 45.00 | 16.00 | 3.40 |
| Min | 108.00 | 69.00 | 89.00 | 14.50 | 2.90 |
| 2xStand. error | 2.12 | 1.59 | 1.0 | .23 | .10 |
Geographically, pullus is partly isolated by the Cerros De Villaguaire and the Cerros El Zapotillo to the west and the Cerros De Azaculapa to the north. Certain individuals of a series of specimens, referable to B. m. nigrescens, from 1 mi. NW San Salvador and 1 mi. S Los Planes, El Salvador, are intermediate in coloration between that subspecies and pullus. Three of 28 specimens from El Salvador possess the mid-ventral white stripe.