174 DR - F - A - JENTINK. MAMMALS. 



No. 408. Very old Q. Bivak Island, January 10. 1910 (skin and skeleton). 



N°. 412. Adult cf. Bivak Island, January 11. 1910 (skin and skeleton). 



N°. 413. Young adult cf. Bivak Island, January 11. 1910 (skin and skeleton). 



N°. 420. Young adult cf. Bivak Island, January 19. 1910 (skin and skeleton). 



N°. 436. Young adult Q. Alkmaar, January 1910 (skin and skeleton). 



N°. 437. Adult Q. Alkmaar, January 1910 (skin and skeleton). 



N°. 443. Very old Q. Alkmaar, January 31. 1910 (skin and skeleton). 



N°. 444. Old Q. Alkmaar, January 31. 1910 (skin and skeleton). 



N°. 476. Old cf. Bivak-island, February 20. 1910 (skin and skeleton). 



N°. 483. Very old Q. Bivak Island, February 25. 1910 (skin and skeleton). 



N°. 486. Very old (f. Bivak Island, March 1. 1910 (skin and skeleton). 



N°. 488. Very old Ç>. Bivak Island, March 3. 1910 (skin and skeleton). 



N°. 497. Adult cf. Bivak Island, March 5. 1910 (skin and skeleton). 



Skeleton with 13 thoracic, 6 lumbar, 2 to 4 sacral and up to 31 caudal vertebrae; N°. 488 

 has 13 thoracic vertebrae like ail the other spécimens but 7 lumbar vertebrae, that is one 

 more; there is no other différence at ail. Mesosternum with four segments; xiphisternum 

 nearly as long as the three adjoining mesosternal-segments taken together, not spatula-shaped. 



Mammae: 1 — 2=6. Some measurements in millimeters: 



^ — 33^ — 335— ^4J_ — 343 — 344— 408 — 41^— 4£3 — 420 

 head and body . 220 — 255 — 255 — 220 — 225 — 240 — 200 — 220 — 210 — 175 



tail. . . . . (i) 180 — inc. — 185 — 170 — 190 — 180 — 175 — 166 — 165 — 141 



hindfoot. ... 42 45 - 42 — 44 — 42 — 44 - 46—33—37 



ear 19 — 20 — 20 — 20 — 20 — 20 ■ — 20 — 19 — 20 — 16 



43 6 — 437--443_ — 444 — 47^ — 483 — 486 — 488 — 497 

 head and body . 195 — 235 — 245 — 240 — 240 — 275 — 260 — 260 — 200 



tail (i) 147 — 173 — 183 — 185 — 170 — 205 — 195 — 190 — 162 



hindfoot . . . . 41 — 43 — 41 — 44 — 47 — 48 — 46 — 45 — 43 

 ear 18 — 19 — - - — 21 — 20 — 23 — 20 — 21 — 20 



Lorentzimys Nouhuysii n. g. et n. sp. 



N°. 319. Old maie. Bivak II (± 400 m.), October 10. 1909. (skin and skull). 



Some measurements taken in the flesh, in millimeters : 



head and body 85 skull: basai lenght 18 



tail 103 zygomatic breadth .... 12.5 



hindfoot 22 diastema 5 



ear 15 upper molar séries .... 3 



This beautiful little jumping mouse is characterized by a very slender and elongated 

 tail, by very large hindfeet and elongated pointed ears. 



Upperparts and sides of body, middle of head and upperparts of cheeks of a fine 

 reddish brown tinge, each hair being slaty for its 2 / 3 basai part and tipped reddish brown 

 for its '/ 3 part; the very soft hairs are closely set, the longest hair does not exceed 6 mm.; 

 head slaty round eyes and from the eyes to the ears; sides of muzzle white; lower parts of 

 cheeks hâve the hair slaty basally, tipped with white; from nose to upper lip pure white 



