68 REVISION OF AMERICAN MOLES— TRUE. vol.xix. 



with S. aquaticus than with S. hreiceri. In an earlier paper I separated 

 Brewer's mole under the generic name of Parascalops.^ 



The (characters which I rely on in making tliis redivision are to be 

 found in the pelvis, the t3^mpauic bulla', and the teeth. Upon com- 

 paring the pelvis of the three species mentioned, it will be observed 

 that in Scalops aqiudicus and Sca2>anus toirnsendi the lateral processes 

 of the sacral vertebra? have united with the ischium in two places, 

 the first opposite the acetabulum and the second more posteriorly. In 

 front of the first bridge on either side is a large oval vacuity or foramen, 

 III addition the spines of the sacral vertebra* in these two species are 

 completely anchylosed together, forming one continuous ridge of bone 

 (as shown in fig. 1). 



Turning to Parascalops hreiceri we find that the sacral vertebrie have 

 no osseous connection with the j^elvis i^osterior to the acetabnhi, and 

 further that the neural spines, though connected at their extremities 

 by a continuous bar of bone, have vacuities between them, so that the 

 several vertebne are readily distinguishable. 



In Scalo2)s aquaticus and Scaptoius toivnsendi the tympanic bulhe are 

 complete, and end externally in a small but well formed bony meatus. 

 Quite diflerent conditions obtain in Parascalops hreiceri, in which the 

 bulhe are irregularly annular and do not conceal the tympanum or form 

 a meatus. 



Finally, in Scalops aquaticus and Scapanus towiisendi the crowns of the 

 molar teeth consist of two large V-shaped external cusps, with a simi)le 

 internal basal projection surrounding the internal edge of the anterior 

 one. 



In P. breweri the basal projection is trilobed and bounds the inner 

 edge of both external cusps. 



On the basis of these characters alone it would be necessary to unite 

 S. aquaticus and S. townsencU in the same genus Scalops.^ But the 

 dental formula of S. aquaticus (together with the relative size and posi- 

 tion of the teeth) differs from that of iScapanus ton')isen((i, and the genus 

 should be retained. 



PARASCALOPS BREWERI (Bachman). 



]?REWER'S MOLE; OR HAIRY-TAILED MOLE. 



Scalopa breweri, Bachman, Boston Jonrn. Nat. Hist., IV, 1842, p. 32. 

 Saqianiis hreiceri, Pomel, Arch. Sci. Phys. et Nat., IX, 1848, p. 247. 

 Siaptinus amcriranus, Coues, Ainer. Nat., XIII, 1879, p. 189. 

 ParascaJops breweri, True, Proo. U. S. Nat. Mus., XVII, 1894, p. 242. 



Size moderate (average length about 177 mm.). Snout acute; nostrils 

 lateral, crescentic. Auricular orifice large, about 3.5 mm. in diameter. 



»Proc. U. S. Nat. Mus., XVII, 1894, p. 242. 



- See the stateineut of Flower and Lydekker : •• The right [of Sciqxuiun] to generic 

 distinction is doubtful." (Mammals, p. G30.) 



