1918] Grinnell: A Synopsis of the Bats of California 297 
Natural History—lIt is probable that in California this species 
is migratory and breeds chiefly in the Transition Zone. The only 
specimens in the Museum of Vertebrate Zoology which are recorded 
as secured in midsummer were taken in the Transition Zone. Stephens 
reports securing specimens in San Diego County in spring and 
autumn only. 
As noted above, a female taken near Pasadena May 29 contained 
a single embryo. 
Myotis thysanodes Miller 
Fringed Bat 
Vespertilio albescens velifer (variety), H. Allen (1894, pp. 92-93). Dul- 
zura (see Miller, 1897b, p. 80). 
Vespertilio albescens evotis, H. Allen (1894, p. 90), part. Old Fort Tejon 
(see Miller, 1897b, p. 80). 
Myotis thysanodes Miller (1897b, pp. 80-85). Original description; type 
locality, Fort Tejon. 
Myotis evotis thysanodes, Elliot (1901, p. 406). Diagnosis; distribution. 
Myotis thysanodes, Miller and Rehn (1901, p. 258). Type locality. 
Myotis thysanodes, Elliot (1904b, pp. 572-573). Diagnosis; distribution. 
Myotis thysanodes, Elliot (1905, p. 479). Distribution. 
Myotis thysanodes, Stephens (1906, p. 268). Description; distribution. 
Myotis thysanodes, Lyon and Osgood (1909, p. 273). Nature and location 
of type. 
Myotis thysanodes, Miller (1912,'p. 59). General range. 
Myotis thysanodes, J. Grinnell (1913b, pp. 278-279). Range in California. 
Diagnosis —Total length, 85 to 95 millimeters. Free border of 
uropatagium thickened and densely haired. 
Description —Largest Myotis found in California excepting Myotis 
velifer. Easily distinguished from velifer by the much longer ears 
which, when laid forward, reach from 3 to 5 millimeters beyond end 
of nose. In an alcoholic specimen the ear measures 15 millimeters 
from notch and the tragus 10 millimeters. Ear convex in outline 
along anterior edge, bluntly rounded at tip and concave along upper 
half of posterior margin, thence convex to the well-defined basal notch. 
Tragus slender and straight, or nearly straight, along anterior edge 
almost to tip, but convex just below bluntly rounded tip; posterior 
border slightly concave just below tip, then convex; margin notched 
just above the basal lobe. 
Limbs and Membranes—-Wing membranes similar to those of 
closely related species of Myotis, but interfemoral membrane heavier 
and more leathery, and distinctly thickened on its free edge. Wings 
arise just proximal to bases of toes. Calear distinct and slightly 
lobed at tip. Foot slightly less than half length of tibia. Forearm 
slightly longer than tail. 
Pelage—Except for thickly haired border of uropatagium dis- 
tribution of fur is similar to that of related species. 
