A MONOGRAPH OF THE BATS OF NORTH AMERICA. 25 



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

 as in Macrotm. Ghiloni/cfcris in like nuinuer 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 Chilonycteris the tuberosity of the ischium is anchylosed 

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

 in Chilonycteris it is less firmly defined. The pectineal spine in Mor- 

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

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

 fibrous tissue to the vertebrae. In both of the genera of Lobostomidfe 

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

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



In 3£olossiis 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 inner trochanter much larger than the 

 outer; truncate with a downward-projecting spine, not carried back- 

 ward. The outer trochanter separated from the head by a slight notch. 

 Condyles equal 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 epiphysis 

 of the femur narrower than the expanded shaft. In N'yctinomus 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 is blunt, rudimental ; tuberosity of the 

 ischium lies in the same line with ilium, and approaches the sacrum, but 

 is not articulated therewith. Both trochanters of the femur are carried 

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

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

 length. Condyles high and narrow, the inner scarcely the wider; 

 notch narrow, deep. Tibia curved with medianly projecting inner 

 tuberosity, malleolus scarcely discernible. Fibula entire; upper i)()r- 

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

 and in the male at least the symphysis ])ubis is well defined; the tuber- 

 osity of the ischium extends back of the line of tiie ilium and almost 

 touches the sacrum. The pubic bone without a thickened inferior 

 border. The femur and tibia nnich as in VesjiertiJio. 



In Yespertilio the ilium is narrow, not expanded above, and not con- 

 cave posteriorly ; the out6r border scarcely thickened near the crest. 

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

 scarcely higher than the acetabulum. The inferior border of the pubic 

 bone greatly thickened near the symphysic line in the male. The in- 



