116 Proceedings of the Biological Society of Washington. 



America, comparatively few specimens having found their way into mu- 

 seum collections. The type of the new form here described flew one 

 evening through the open door of the American Consulate at Coatzacoalcos 

 where Mr. Nelson happened to be sitting, and was secured by him. The 

 curiosity of the people was aroused by its capture, but none of those 

 questioned had ever seen such a bat, and no other examples were met 

 with by us in the course of our work in tropical Mexico. 



Specimens examined. — Total number, 4, as follows : 



Mexico: Coatzacoalcos (type locality), 1. 



Nicaragua: Chinandega, 1. 



Panama: Boqueron, 2. 



Sturnira lilium parvidens, subsp. nov. 



NORTHERN YELLOW-SHOULDERED BAT. 



Type from Papayo (about 25 miles northwest of Acapulco), Guerrero, 

 Mexico. No. 126,555, 9 adult, U. S. National Museum (Biological Survey 

 collection), collected by E. W. Nelson and E. A. Goldman, April 17, 

 1903. Original number 16,313. 



General characters. — Similar in general to Sturnira lilium lilium of 

 Paraguay, but forearm and tibia usually shorter; skull similar in length 

 but narrower, with smaller molariform teeth. 



Color. — Within the range of individual variation exhibited by examples 

 of S. I. lilium; upperparts in the type (dry skin) overlaid with cinnamon- 

 brown, the basal color of the fur near clay color; underparts tawny-olive. 

 A younger example is drab brownish above and below. 



Skull. — About like that of S. I. lilium in length, but narrower through- 

 out; incisive foramina less widely open; molariform teeth smaller, the 

 reduction in size mainly in transverse extent. 



Measurements. — Type: Forearm, 41.9; tibia, 14.2; foot (calcaneum to 

 end of claw), 13.3 (without claw), 12. Skull (type): Greatest length, 

 23.4; breadth of braincase (across paroccipital processes), 11.6; inter- 

 orbital breadth, 6; maxillary toothrow (front of canine to back of pos- 

 terior molar), 6.6; mandibular toothrow, 7.9; distance between outer 

 sides of canines at cingulum, 5.9. 



Remarks. — Sturnira lilium, undivided subspecifically, has been ac- 

 corded a geographic range from Paraguay to Mexico, but comparison of 

 Mexican material with 24 examples from Villa Rica and Sapucay, Para- 

 guay, reveals the existence of a well-marked northern race. The forearm 

 is shorter in most of the specimens available of the Mexican form, but in 

 two from Mirador it is as long as in some of the Paraguayan examples. 

 Characters more obviously distinguishing the Mexican form are the nar- 

 rowness of the skull and molariform teeth. The skull of the specimen 

 from La Tuxpana, Campeche, appears abnormally small (greatest length, 

 20.1) for a form of S. lilium and may represent that of a distinct species. 



Specimens examined. — Total number, 6, as follows: 



Campeche: La Tuxpana, 1. 



Guerrero: Papayo (type locality), 1. 



Vera Cruz : Mirador, 4. 



