NO. 1116. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



531 



and throat almost, sometimes quite, uiiiformly this color) and the upper 

 parts very much darker. lu fact, they resemble exactly in coloration 

 the young of (}. fuliyhiosa, but are decidedly smaller. Only one of 

 them has the sex determined, and that is marked " 9 ." itnless these 

 are unusually small young birds of G.fuHginosa, I should be inclined to 

 regard them as all young males of G. imrvula, notwithstanding the 

 determination of the specimen mentioned; for it looks very much as if 

 the sexual difference in color might, in this form, be as well marked in 

 the young as in the adults. 



An adult male from Chatham Island, which seems to be referable to 

 G. parvula, has a longer wing and tail than Abingdon Island specimens, 

 but does not otherwise differ in measurements, which are as follows 

 Length (skin), 3.90; wing, 2.39; tail, 1.45; culmen, 0.47; gonys, 0.25 

 basal width of mandible, 0.25; basal depth of bill, 0.32; tarsus, 0.72 

 middle toe, 0.51. In color it resembles the adult (or nearly adult) male 

 from Abingdon Island described above, having the rump dusky olive 

 and the posterior under parts (from upper belly and middle of sides 

 backward) much streaked or intermingled with dull grayish white. 



Respecting the occurrence of this form on Barrington and Indefati- 

 gable islands, 1 hnd among the notes made on the Baur- Adams collec- 

 tion a memorandum to that effect; but as my present understanding 

 of G. parviila is somewhat different from what it was at the time the 

 specimens were examined, the specimens (which unfortunately I have 

 not access to at present) should be reexamined. 



Measuremenis of (reospiza parvuJa. 



GEOSPIZA ACUTIROSTRIS, Ridgway. 

 (Plate LVII, fig. 21.) 



Geospiza acittirostris, Ridgway, Proc. U. S. Nat. Mus., XVII, No. 1007, Nov. 1,5, 

 1894, p. 363 (Tower Islaiid, Galapagos Archipelago; collection of Dr. G. 

 Baur). 



Specific characters. — Similar to G. parimla, Gould, but bill longer, 

 with straighter outlines, and extremely acute at tip. 



Measurements of type. — Wing, 2.45; tail, 1.58; culmen, 0.55; depth of 



