270 THE SKULL AND TEETH OF ECTOPHYLLA ALBA. 
( a. Angle of lower jaw narrow, aciculate, not deflected ; posterior border of ascending 
ramus defined ; hard palate oblong ; palate produced. 
b. Palatal bones extend to point answering to the middle of zygoma. Upper incisors 
flat ; first upper premolar broadly lanceolate ; crowns of molars rugose ; proto- 
conid and paraconid of first lower molar prominent, subequal, the others rudi- 
ee mental. 
CEO pe OUCI NS eres Gy WIDE #roccsccecocsscontcooscs0ssdoonnoos.osnao2esenscasnseosoososcaerocnBNNONOADNODSONN Artibeus. 
Gl. WIGS 2 -cococonencoso op eanbacoadapo Scand cnoSesndoorocosDosHONENDOAboSSHHoooSSANNIG Dermanura. 
b’. Palatal bones extend to point answering to the anterior third of the zygoma. 
Upper incisors conical, contiguous ; first premolar narrow lanceolate ; crowns 
of molars smooth ; all cusps of first lower molar subequal, anterior commissure 
Ip 
@msjaneeine 8 NOMEN 2 oocossocoasos ope cocogasQnecdencencocosoeponHSSconBeGREoSioconnCoD4 Sturnira. 
Il. First lower molar subquadrate without paraconid. 
if d. Hard palate oblong, palatal bones produced. Upper incisors conical. 
e. Angle of lower jaw quadrate, not deflected, posterior border defined. 
Nasal bones absent in adult ; palate bones produced nearly to 
the line of glenoid cavity. First upper premolar acicular ; first — 
ae lower molar with protoconid and mesaconid subequal. Molars 2... 
Group Vampyropini....-.- Cee 
e/. Angle of lower jaw acuminate, not deflected. Protoconid of first 
lower molar aciculate, enormous. 
Jf. Hypoconid first lower molar rudimental ; molars 2... Vampyrops. 
jf’. Hypoconid first lower molar none ; molars 3.........-.. Ectophylla. 
ad’, Hard palate round, palatal bones scarcely, if at all,* produced. 
| e/’. Angle of lower jaw rounded, deflected, posterior border ascending 
ramus not defined. 
g. Frontal bone in orbit greatly inflated ; palatal bones extend 
to a point answering to the anterior root of the zygoma ; 
| pterygoids produced, inflated and nearly teaching the 
panic bones; upper incisors conical ; protoconid of 
first lower molar searcely larger than other cusps ; hypo- 
| conid of the same tooth marginal, rudimental molars 2... 
| Pygoderma. 
Cremicrenodencie | g'. Frontal bone in orbit not inflated ; palate bone produced 
to anterior third of zygoma; upper incisors conical ; 
protoconid first lower molar enormous; hypoconid of 
same tooth marginal ; molars }...-.....-.---..-.-+ Ametrida. 
g'’. Frontal bone in orbit scarcely inflated ; hard palate with 
posterior margin excised; pterygoids not produced. 
| 
| 
| 
| 
| Upper incisors flat; protoconid of first lower molar 
| enormous. 
h. Palate excised to first molar ; hypoconid of first lower 
| molar inside contour. Molars .........-. Stenoderma. 
| h’'. Palate excised to middle of first molar ; hypoconid of 
| 
first lower molar marginal. Molars 2 ... Trichocorys. 
* Mr. O. Thomas (Ann. and Mag. Nat. Hist., 1889, p. 70) first employed this character to separate this group from 
the foregoing. 
