ALLEN: BATS OF THE GENUS CORYNORHINUS. 345 



Color. — Adults: general effect above a uniform 'warm sepia.' 

 The basal half of the hairs is dark slaty in strong contrast to the 

 terminal half or third which is nearly 'snuff brown.' Downy hairs 

 at the posterior bases of the ears and on their anterior rim, whitish. 

 Below, the rich brownish of the back passes gradually into a wash of 

 pale wood brown, nearly ' avellaneous ' (Ridgway, 1912). All the 

 hairs of the ventral surface are 'blackish plumbeous' in the basal 

 half. 



Immature specimens (76250 Biol. Survey Coll., from Comox, B. C.) 

 are darker, the hairs nearly uniform blackish plumbeous, with a faint 

 brown tipping, above. Below, the pale tips of the hairs are more 

 noticeable, and the coloring is much as in the adult, though lacking 

 the warm brownish or russet wash. 



Skull. — No tangible differences can be made out that will distin- 

 guish the skull of townsendii from that of pallescens. As in the latter 

 the second lower premolar is frequently drawn in from the axis of the 

 tooth-row and the inner upper incisor is normally unicuspidate. In 

 two specimens examined, however, the latter tooth has a distinct 

 shoulder or incipient cusp (204435, 76250 Biol. Survey Coll.). Com- 

 pared with C. macrotis the profile of the skull is more abruptly ele- 

 vated from the rostrum. 



Measurements. — No. 9744 Field Mus. Nat. Hist, from Goldbeach, 

 Oregon: forearm 43 mm. (average of ten Oregon specimens 42.0); 

 digit III, metacarpal 38 (average of ten Oregon specimens 38.4); 

 first phalanx 12.8 (average of same ten 12.7); second phalanx 16 

 (average of same ten 16.8). Collector's measurements: total length 

 111mm.; tail 47; hindfootl2; ear 36. 



Skull: greatest length 16.2 mm.; basal length 13.5; palatal length 

 7.5; zygomatic breadth 8; interorbital constriction 4; mastoid 

 breadth 9; width of braincase 8; upper toothrow 6.3; lower tooth- 

 row 7. 



Remarks. — This dark brownish race is characteristic of the humid 

 coastal area of western North America from southern British Columbia 

 southward to the region of San Francisco, California. Inland from 

 the coast ranges and to the south and east of San Francisco the 

 increasing aridity causes a progressive decrease in the amount of dark 

 pigment so that complete intergradation by imperceptible degrees 

 takes place with the interior subspecies pallescens. Specimens from 

 intermediate localities can usually be referred to one or the other, 

 however, though occasional individuals are strictly intermediate. A 

 skin from Mt. Veeder, Napa County, just north of San Francisco, is 



