ART. 19 BATS OF THE GENUS TADARIDA — SHAMEL 13 



Remarks. — This bat bears a close relationship to T. aurispinosa the 

 type and only known specimen of which has no skull. However, 

 T. aurispinosa has a longer tibia and forearm, 15.5 mm. and 50.0 mm. 

 as against a shorter tibia and forearm, 13.2-14.6 mm. and 45.6-48.6 

 mm. in T. laiicaudata, which leaves some ground, though slight, for 

 the separation of the two animals. 



TADARIDA FEMOEOSACCA (Merriam) 



1889. Nyctinomus femorosaccus Merriam, North Amer. Fauna, No. 2, p. 23, 



October 30, 1899. 

 1902. Nyctinomops femorosaccus Miller, Proc. Acad. Nat. Sci. Philadelphia, p. 



393, September 3, 1902. 

 1923. Tadarida femorosacca Miller, List North Amer. Recent Mamm. 1923, 



BuU. U. S. Nat. Mus. 128, p. 86, April 29, 1924. 



Type locality. — Agua Caliente, Sonoma County, California. Type 

 specimen in United States National Museum. 



Geographic distribution. — Arizona, California, Lower California, and 

 Jalisco, Mexico. 



Diagnosis. — Like T. laticaudata but occipital depth of skull slightly 

 less, 6.0-6.4 mm. as against 6.5-7.0 mm., and color of only skin ex- 

 amined, which is immature, darker, and less red than in South Ameri- 

 can specimens of similar age. 



Measurements. — For detailed measurements see tables, pages 22 

 and 27. 



Specimens examined. — Nine specimens examined from the following 

 locahties: Arizona: Fort Huachuca, 1 alcohohc, Coyote Mountains, 

 1 skin. California: Agua Caliente (type), 1 alcohohc; Colorado 

 Kiver mouth, 1 alcohohc. lower California: Santa Anita, 1 alco- 

 hohc; San Pedro Mountains, 1 alcohohc. Jalisco: Zacoalco, 3 

 alcoholics. 



Remarks. — The skins of T. laticaudata are near vandyke brown 

 (Ridgway 1912), except one immature skin which is lighter in color 

 than the adults, but distinctly different in color from the young 

 T. femorosacca. 



This form is so Uke T. laticaudata that if the form had not already 

 been named there would be no very good reason for separating it. 



The three specimens from Jahsco extend the known range of 

 Tadarida femorosacca into central western Mexico. These specimens 

 have been in the coUection smce 1892, but had never previously been 

 separated from some specimens of T. mexicana collected at the same 

 locahty. Compared with specimens taken farther north they have a 

 slightly longer ear, 22.2-22.8 mm. as against 18.6-21.5 mm. in five 

 specimens from the United States and Lower Cahfornia. The skulls 

 have a rather better developed sagittal crest and the width at the 

 base of the canines is greater, but these differences are sUght and of 

 no great importance in so small a series. 



