10 NORTH AMERICAN IJATS — II AI.LEN. 



Ill illiishMtioii of IIm' \;ilu(' <»r the car in clussilicatiou Mic lollow iiij;- 

 table is iliawii up iVom tlic iiumuIkms of the biits described in this 

 UKMUoir. 



PhyUosioinUltv. — ICxtcrnal ear without intciual basal h»be. l'j.\ternal 

 rid^e rudiineutal or absent. Extenuil basal lobe not marginal, but lies 

 Avell within the huge second scallo]), Avhich is eoiitinued well in front; 

 tragus proreet, coarsely crenulate or spiuose on outer border. 



Molossi. — Ears without internal basal lobe. Internal ridge produced 

 tbrniiug a "keel." External ridge marginal, produced, l)onnding exter- 

 nal basal lobe. Externa! basil noteh oix'u, /. <•., not covered by h>wer 

 scalloj); tragus rudiineutal. 



]^<:sj)cffili(>iti<l(r. — b^arswitli internal basal lobe, rntei'ual an'd exter- 

 nal ridges rudinieutal, not jiroduced. h^xternal basal lobe marginal 

 (except Plecoti), not touching external basal ridge. External basal 

 notch oci'upied by i)roduced lower scalloi». Tragus obscurely cn'nu- 

 late on outer border, or smooth. 



SECONPAIJY SKIN DEVELOPMENTS. 



At the nuizzle the skin folds are median and lateral. The margins 

 of the nostrils expand above and at the outer side while they are sepa- 

 rated by a groove or a ridge in the middle line, as is seen in Brachi/- 

 j)ln/ll(( and Xi/ctiiiomus. Or the two lines of ])erinarial expansion may 

 meet below in the space between the nostrils and the lip to Ibnn a 

 swollen ridge as in Glossopliana or a lap])et as in most V<())q)i/ri, while 

 the iuternarial ridge is continuous with a vertical leaflet. This is the 

 type seen in most of the Phyllostomidje as exemplitied in this memoir 

 in Arflhcits and ^[(t<^n>tKs. The nostrils may remain simple with upper 

 border ad\anced upon lumen of the opening so as to divide it into two 

 coruua as in most Vespertilionida' or the lumen ma> i)e oval as in IJu- 

 (Urma 



The lower lip is liriidy held to the gum of the lower incisor teeth, as 

 in \'espertilio, or it is free and forms a ])rotrnsile, membranous fold 

 as in At((l((pha. It maybe entire or divided in the center so as to form 

 two chin ])lates as in Macrotiis and as a variation in Xi/rtic(jus. In 

 Atalapho a distinct lappet extends entirely across the chin and in de- 

 grees of development distinguishes the sexes. The chin itself and the 

 space directly back of it is adorned with scattered warts in all forms, 

 but in ]*Iiifllost<tnii(J((\ as shown in ArtihcKx, the entire chin is conspicu- 

 ously adorned with verruca^ arranged in median and lateral groups. 

 In (^liilonin-tcriN and ,1/o/-;//(>/m' these are the sites of curi<msly complex 

 leatlets. 



The sides of the face are furnished with skin folds of \arious lengths, 

 which are continuous with the external border of the auricle, or a large 

 wart lies directly back of or below the angle of the moutli, while the 

 sides of the muzzle ai'C ai)t to be moie or less thickt'ued by swollen 

 glantl-masses, which tend to embrace the side of the nose-leaf as in 



