654 Bulletin American Museum of Natural History. [Vol. XXIV, 



zygomatic breadth, 21, nasals, 16.7). The two forms apparently are quite 

 similar in coloration, judging from Tomes's description (P. Z. S., 1861, 

 pp. 282-284). 



22. Akodon teguina (Alston). Five specimens, all collected at San 

 Rafael del Norte, altitude 4000 to 5000 feet, April 12-17, 1907. Provision- 

 ally referred to A . teguina, the type locality of which is Coban, Guatemala, 

 although probably subspecifically different. 



23. Reithrodontomys modestus Thomas. Seven specimens, of which 

 four are from San Rafael del Norte and three from Lavala. Unfortunately 

 the skulls are lost or too much broken to be of use in identification. Three 

 adults measure, total length, 140 mm., tail, 70-75. A young adult agrees 

 very well with Thomas's description of modestus, but two adults differ in 

 having the sides of the body strongly suffused with yellowish rufous, and 

 the tail is gray below instead of concolor, and the breast spot is fulvous instead 

 of drab, as in the younger specimens. The type locality of modestus (Jino- 

 tega, Nicaragua, altitude 4650 feet) is only a short distance from San Rafael 

 del Norte. 



24. Reithrodontomys sp. One specimen, without skull, Ocotal, May 11, 

 1908. A dull-colored medium-sized species; total length, 170 mm., tail, 80. 



25. Reithrodontomys sp. Two immature specimens, without skulls, 

 one each from Rio Grande and Tuma (below 1000 feet). 



26. Reithrodontomys sp. One specimen, San Rafael del Norte, April 

 10, 1907. A very small species with a very long tail (total length, 140 mm., 

 tail, 90), wholly unlike the other San Rafael specimens of Reithrodontomys. 



Further notice of these undetermined species of Reithrodontomys is 

 deferred in the hope that additional specimens with good skulls will be 

 received in later shipments. 



27. Oryzomys (Melanomys) chrysomelas Allen. Sixteen specimens 

 all from the east coast low country, as follows: Lavala, 2 specimens, Oct. 11 

 and 13, 1907; Tuma, 6 specimens, Nov. 20-28, 1907; Chontales, 2 speci- 

 mens, Feb. 20 and 25, 1908; Rio Grande, 6 specimens, Feb. 25, 28, March 

 30, April 2 and 4, 1908. 



The collector's measurements of 12 specimens, about an equal number 

 of males and females, all adult, are: Total length, 206 mm. (200-220); 

 tail vertebrae, 98.5 (80-110); hind foot, without claws, 20.1 (20-20.5). 



Externally these specimens are indistinguishable from the original type 

 series of five from Suerre, Costa Rica, of which there were no external 

 measurements, of which none was very old, the teeth of all being nearly 

 unworn. In the present series the skulls average slightly larger, evidently 

 owing to the greater age of most of the specimens, in some of which the 

 teeth are much worn. 



