552 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
[Anous] stolidus subsp. galapagensis Forses and Roginson, Bull. Liverp. Mus., 
ii, no. 2, 1899, 56. 
Anous galapagoensis Baur, Am. Nat., xxxi, 1897, 782 (Duncan Island), 783 
Gardner-near-Hood Island). 
Genus MEGALOPTERUS Boie. 
Megalopterus Bon, Isis, 1826, 980. (Type, by monotypy, Sterna tenuirostris 
Temminck.) 
Micranous¢ SaunpeErs, Bull. Brit. Orn. Club, no. xxiii, Jan. 29, 1895, p. xix; 
Ibis, April, 1895, 276. (Type, by original designation, Sterna tenuirostris 
Temminck.) 
Anousella 6 MatruEws, Birds Australia, ii, pt. 4, Nov. 1, 1912, 412, in text. (Type, 
by original designation, Anous leucocapillus GouLD.) 
Medium-sized or rather small Sternide (wing 210-225 mm.) 
resembling Anous, but with gonys longer than mandibular rami 
(instead of shorter), maxilla not decurved distally, and tail léss 
strongly graduated and less deeply forked. 
Bill relatively slender, longer than head, nearly straight (the 
exposed culmen, however, shorter than middle toe with claw), its 
greatest depth equal to only one-fourth (or less) the distance from 
anterior end of nostril to tip of maxilla; culmen straight for most of 
its extent, very slightly decurved distally; gonys longer than man- 
dibular rami, straight, slightly ascending terminally, rather prominent 
basally; nostril narrowly elliptical or linear, longitudinal, almost 
wholly anterior to mental antia; anterior outline of feathering on 
forehead and lores sloping backward and downward from frontal 
antia (at base of culmen) to rictus, without trace of loral or latero- 
frontal antia. Wing long and pointed, the longest primary (outer- 
most) exceeding distal secondaries by decidedly more than half the 
length of folded wing, but by very much less than twice the distance 
from tips of distal secondaries to bend of wing. Tail decidedly more 
than half as long as wing, slightly forked and moderately graduated, 
the lateral pair of rectrices about three-fourths as long as the longest 
(third and fourth pairs, counting from middle), the middle pair 
shorter than longest by much less than half the distance between 
tips of longest and shortest rectrices; rectrices slightly but distinctly 
tapering terminally, with rounded tips. Tarsus decidedly shorter than 
middle toe without claw; outer toe as long as middle toe or very 
slightly shorter; webs between anterior toes with anterior edge but 
slightly excised. 
Plumage and coloration.—Plumage blended throughout as in Anous, 
with occipital feathers not elongated,. Adults plain dusky, except 
pileum and nape, which are grayish or whitish. 
Range.—Tropical seas of both hemispheres. (Two species ?) 
@ Mixpés, small; + Anous (avoos, silly, stupid). (Richmond.) 
b Anous (&vous, foolish)+ella. (Mathews.) 
