^°is9yy' ] PROCEEDINGS OF THE NATIONAL MUSEUM. 23 



In Monnop.s tlie ilium is y;reutly compressed between the veutral unci 

 dorsal surfaces; first joint of the tail very long. The femur and tibia 

 as in MaerotuH. Ghilonycteris in like manner exhibits a compressed 

 ilium ossified to sacrum with broad rugose external border adjoining 

 crest. Dorsal surface slightly concave and expanded. In both Mor- 

 mops and Ghilonycteris the tuberosity of the ischium is anchylosed 

 to the sacrum. The pubis in the male of Mormops is bony and entire; 

 in Chilomjcieris it is less firmly defined. The pectineal s[)ine in Mor- 

 mops is two-thirds the length of the ilium. In Chilonycteris davyl it 

 is remarkable for being nearly as long as this bone and bound by 

 fibrous tissue to the vertebrii?. In both of the genera of Lobostomida'. 

 the trochanters of the femur are approximate, coufiuent, and carried 

 well back of the head. Tibia and fibula much as in Macrotus. 



In Molossus the innominate bone is compressed, expanded. It is con- 

 cave dorsally with narrow iliac upper border slightly projecting. Pec- 

 tineal spine one-third the height of the ilium. Pubic symphysis en- 

 tire, bony. Tuberosity of the ischium projects well backward, but is 

 free from the sacrum. The inn«^r trochanter much larger than the 

 outer ; truncate with a downward projecting projecting spine, not car- 

 ried backward. The outer trochanter separated from the head by a 

 slight notch. Condyles ei^ual in size; notch wide, shallow. Tibia 

 straight with large malleolus. 



In Promops the pelvis entire as in Molossus; characters much the 

 same as in this genus, but the upper border of the ilium without spine 

 and the tuberosity articulating with the sacrum, but not anchylosed 

 thereto. Femur and tibia of the same character — the distal epiphj'sis 

 of the femur narrower than the expanded shaft. In Nyetinomus the 

 ilium as in Molossus, but the pubic bones free ; femur and tibia the 

 same. 



In Atalapha the ilium is quite as in Molossus, but is not anchylosed to 

 the sacrum. The pectineal spine blunt, rudimental; tuberosity of the 

 ischium lies in the same line with ilium apprc^aches sacrum, but is not 

 articulated therewith. Both trochanters of the femur are carried 

 backward as in Vampyri, but are not approximate; /. e., they are visible 

 from in front; the inner is the narrower, though they are of the same 

 length. (Jondyles high and narrow, the inner scarcely the wider; 

 notch narrow, deep. Tibia curved with mediauly projecting inner 

 tuberosity, malleolus scarcely discernible. Fibula entire; upper por- 

 tion membranous. In AntrozoHS the ilium is anchylosed to the sacrum 

 :and in the male at least the symphysis jiubis is well defined; the tuber- 

 'osity of the ischium extends back of the line of tne ilium and almost 

 touches the sacrum. The i^ubic bone without a thickened inferior 

 border. The femur and tibia much as in Vespertilio. 



In Vespertilio the ilium is narrow, not expanded aboi^e and not con- 

 <'.ave posteriorly ; the outer border scarcely thickened near the crest. 

 The pectineal spine low. compressed, directed slightly forward, blunt, 



