250 Mr. 0. Thomas on new 



colour ; thorax, abdomen, and legs pale fawn-colour. Pri- 

 maries and secondaries pale reddish fawn-colour; primaries 

 crossed from the apex to the inner margin close to the base by 

 a dark brown line, lightest on the outer edge. Underside 

 the same as above, but without any line on the primaries. 



Expanse 1^ inch. 



Ilab. Amazons (Leech, Mas. Druce). 



Maschane neobule, sp. n. 



Male. — Head, antennae, and collar yellowish brown ; tegula?, 

 thorax, and abdomen greyish. Primaries yellowish fawn- 

 colour, almost yellow along the costal margin ; a very fine 

 brown line crosses the wing close to the base ; a brown line 

 extends from the apex to the middle of the inner margin ; 

 two round dots in the cell and a submarginal row of very 

 minute brown dots extends from the apex to the anal angle ; 

 the fringe brown : secondaries reddish brown, palest at the 

 base. Underside of both wings reddish cream-colour. 



Expanse If inch. 



Ilab. Costa Rica (Mus. Druce). 



XXIX. — New Formsof Saimiri, Saccopteryx, Bulantiopteryx, 

 and Thrichomys from the Neotropical Region. By 

 Oldfield Thomas. 



Saimiri Oerstedi citrinellus, subsp. n. 



The Costa Rica form of the Panama S. Oerstedi — the 

 head less blackened, and the limbs less yellow. 



General characters as in true Oerstedi. Back of the same 

 vivid orange or orange-ochraceous, or slightly paler, but ante- 

 riorly that colour narrows between the shoulders, leaving the 

 region of the shoulder-blades greyish, like the arms. Below, 

 the belly is scarcely, instead of being strongly, more yellowish 

 than the white throat and axillee, and the groins and inner 

 sides of the thighs are whitish instead of yellow. Crown of 

 head either altogether grey, as in S. sciurus, or with the tips 

 of the hairs blackish, as in 6\ boliviensis, not deeply black as in 

 S. Oerstedi. Arms to wrists and legs from thighs downwards 

 grizzled greyish, with but little yellowish suffusion, these 

 parts being in Oerstedi strongly suffused with orange-yellow. 

 Hands orange, of rather a paler shade than in Oerstedi, the 

 orange running up the outer side of the forearms to the 



