NO. 2013, 



BATS OF THE GENU 8 MOLOSSVS— MILLER. 87 



which Geoffroj knew at firat hand and from which he derived his 

 technical characters. The generic name MqIossus therefore continues 

 to be applied to the group for which it is in current use, though with 

 M. major (^&vv) = V es'pertilio molossus of authors (part) form Mar- 

 tinique as the type. 



KET TO THE BATS OF THE GENUS MOLOSSUS. 



Greatest breadth across upper canines 5 mm. or more (m/tts-group). 

 Forearm 47-51 mm.; greatest length of skull 21-23 mm. 



Color brownish (French Guiana to Peru and Paraguay) rufus (p. 88). 



Color blackish (Mexico) nigricans (p. 88). 



Forearm 43-47.5; greatest length of skull 19-21.3 mm. 



Color light and dull (Mexico to Panama) sinalose (p. 89). 



Color dark and rich (Venezuela) pretiosus (p. 88). 



Greatest breadth across upper canines less than 5 mm. 



Greatest length of skull 18-18.6 mm. (currentium-grouip) . 



Color with a decided tendency toward broccoli-brown and drab (Argentina). 



currentium (p. 89). 

 Color a rich dark brown (Central America and northern South America) 



bondse (p. 89). 

 Greatest length of skull 14.8-17.4 mm. 

 Forearm 33-37 mm. (pygmaeus-gromp) . 



Braincase unusually inflated, its greatest width about 9 mm. (British 



Guiana) burnesi (p. 91). 



Braincase normal, its greatest width about 8 mm. 



General color a light brown usually much tinged with drab, espe- 

 cially on underparts (Curasao, Peru, and Ecuador) 



pygmseus (p. 92). 



General color a clear brown rarely if ever distinctly tinged with drab. 



Upper parts very dark, usually something between burnt-umber 



and seal-brown (Panama) coibensis (p. 92.) 



Upper parts not very dark, usually something between raw- 

 umber and wood-brown (Cuba) tropidorhynchm (p. 92). 



Forearm 36-41 mm. (otscMrtts-group). 



Lower leg 19-21.6 mm.; greatest length of skull 15-16.4 mm. 



Molars averaging larger (Dominica, [Martinique], Trinidad, Vene- 

 zuela) major (p. 90). 



Molars averaging smaller (St. Eitts, Nevis, Antigua, Montserrat). 



debilis (p. 90). 

 Lower leg 20-23.8 mm.; greatest length of skull 16-17.4 mm. 

 Lower leg usually more than 22.6 mm. (22-23.8 mm.) 



Rostrum normal (Porto Rico) fortis (p. 89). 



Rostrum short and heavy. 



Molars large (Jamaica) fuliginosus (p. 90) . 



Molars small (Santo Domingo) verrilli (p. 90). 



Lower leg usually less than 22.6 mm. (21-22.6 mm.) 



Underparts with a decided tinge of drab (Mexico) .aztecus (p. 91). 

 Underparts without decided tinge of drab. 



General color moderately dark, approaching raw-umber 



(Paraguay) crassicaudatus (p. 91). 



General color very dark, burnt-umber or darker (Brazil, 

 British Guiana, Barbados, St. Lncia,)... obscuriis (p. 91). 



