7. Not occurring on Galapagos Islands _L. borealis._ 7'. Known only from Galapagos Islands (both ear of 7.6 mm. and thumb of 6.4 mm. allegedly shorter than in _L. borealis_ of adjacent mainland; presence of lacrimal ridge not verified) _L. brachyotis._ 6'. Upper parts not brick red to rusty red; lacrimal ridge not developed. 8. Forearm more than 46.5 mm. (48 in only known specimen, a male); dorsum bright rufous (absence of lacrimal ridge not verified) _L. egregius._ 8'. Forearm less than 46.5 mm.; dorsum not bright rufous. 9. Upper parts mahogany brown washed with white; forearm less than 43 mm _L. seminolus._ 9'. Upper parts deep chestnut; forearm more than 43 mm. (44.8 in only known specimen, a female) _L. castaneus._ 1'. Color yellowish; only one premolar on each side of upper jaw. 10. Total length more than 119 mm.; length of upper tooth-row 6.0 mm. or more _L. intermedius._ 10'. Total length less than 119 mm.; length of upper tooth-row less than 6.0 mm _L. ega._ Lasiurus intermedius Northern Yellow Bat _Diagnosis._--Upper parts yellowish-orange, or yellowish brown, or brownish-gray faintly washed with black to pale yellowish gray; size large (forearm, 45.2-62.8; condylocanine length, 16.9-21.5). _Distribution and Geographic Variation_ _Lasiurus intermedius_ H. Allen, type from Matamoros, Tamaulipas, has been reported from the Rio Grande Valley of Texas southward to Honduras and in Cuba. _Lasiurus floridanus_ (Miller), type from Lake Kissimmee, Florida, has been recorded from southeastern Texas, eastward along the Gulf of Mexico to Florida, and thence northward along the Atlantic Coast to extreme southeastern Virginia (see records of occurrence beyond and Fig. 2). Specimens of _intermedius_ from the vicinity of the type locality and from other localities in Mexico differ from specimens of _floridanus_ (from Florida and southern Georgia) as follows: Larger, both externally (especially forearm) and cranially (see measurements); teeth larger and heavier; skull heavier and having more prominent sagittal and lambdoidal crests; braincase less rounded, more elongate; auditory bullae relatively smaller; upper parts averaging brighter (yellowish to yellowish-orange in general aspect, rather than yellowish-brown to brownish-gray).