A MONOGRAPH OF THE BATS OF NORTH AMERICA. 103 



liglitei- shade to tlio fur and a slightly smaller thnirib wonhl readily 

 carry them over to V. nitidus ciUolahruni. 



Two examples (No. 12450, U. S. N. M., both gravid females) collected 

 by ]\lr. H. W. Heiishaw, near Wingate, IST. Mex., in ISI'2, presented 

 snch marked color phases as to suggest that if these i)rove to be con- 

 stant in individuals collected from this portion of the country that a 

 separate geographical snbs})ecies of T'. nitidus be based u[)on theni and 

 the somewhat similarly colored si^ecimens from the Death Valley re- 

 gion. The fur is long, silky, nearly white above in one specimen, and 

 brilliant light aureons in the second. Both specimens are quite white 

 beneath. Interfemoral membrane hairy above nearly to ankle, the back 

 of thigh and leg being covered. The general jiroportions are quite as 

 in the type of T". nitidus. If subsequent observation confirms such sub- 

 specific determination, the name T". nitidus Henshan-ii may be given it. 

 Mr. Heushaw was the first collector who brought this phase of vesper- 

 tilionine life to the attention of naturalists. 



V;ir. ((). Vespertilio nitidus longicrus (True). 



VesiwrtUio Iviigicriis F. W. True, Proc. U. S. Nat. Mus., 1887, (5. 



The following is the original text of the description : 



Glandular prominences of the sides of the face well developed, as in T'. lucifugns, 

 making the muzzle appear hlunt. Ears shorter than the head; laid forward they 

 do not reach the nostrils by a millimeter; inner margin evenly convex from lobe to 

 tip; upper third of outer margin scarcely conclave, lower two- thirds rather strongly 

 convex. Length of the tragus slightly more than one-half the height of the ear; in- 

 ner margin concave, outer margin convex, crenulate; tij) rounded off. 



Wings from the base of the toes; foot less than one-half the length of the head. 

 Tail long. Interfemoral membrane deep antero-posteriorly ; the hinder margin 

 straight in the posterior half. Calcaueum ending in a small rounded lobe in the 

 middle of the hinder margin of the interfemoral membrane; the margin between this 

 lobe and the foot very convex. Only the cartilaginous extremity of the tail free. 

 Tibia very long, excelling the head by nearly one-fourth. 



The fur of the body extends on the interfemoral membrane along the tail as far as 

 a line joining the centers of the tibia^. The fur above uniform umber colored, or 

 slightly lighter at the extremities; beneath, umber in the basal three-fourths, dull 

 Naples yellow in the apical fourth. Membranes dull brown. 



Skull with the face very short and the brain-case greatly elevated. Teeth as in 

 V. htcifttgus, except that the Jirst upper premolar is not crowded behind the canine. 



On account of the length of the tibia I have thought it appropriate to name the 

 species Vespertilio lour/icrus 



It is evident that it is closely allied to V. I iicifugus, hut it is readily distinguish- 

 able from that species by its shorter and l>roader ears, longer tibiie, smaller feet, and 

 duller color. 



MeaaurcmvntH of Vespertilio lonyicrus, 15623, I'ltt/et iSoiauI. 



Millimeters. 

 Length of head and body 47. 5 



Length of head 16. 



Height of ear 12. 5 



Lengtii of tragus 6. 5 



Length of forearm 39. 



Length of thumb 6. 



Length of tibia 20. 



Length of foot 7. 5 



Length of tail 45. 



