182 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
to the tips, with a narrow edging only of reddish, instead, as in both the other species, of 
having the entire inner webs of most of these feathers light cinnamon. The bill is shaped as 
in crinitus, hut the edges are slightly convex instead of straight; it is broader than in mexi- 
canus. 
It is probable that the male of this species is somewhat differently colored from the female 
described above. 
It is not improbable that this bird may belong to the genus Blacicus of Cahanis (Journal fur 
Ornithologie III, Nov. 1855, 480,) characterized as having the wings shorter than in Myiar- 
chus ; the bill much depressed, flat, and broad ; the tail somewhat emarginated. In this event, 
and should the genus he considered worthy of retention, the present species will he called 
Blacicus lawrencii. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collected. 
Whence obtained. 
Orig’l 
No. 
Length. 
Extent. 
Wing. 
Remarks. 
10028 
9 
San Diego, New Leon. 
Spring of 1853 
Ll. Couch. 
110 
7.00 
10.00 
3.50 
Eyes brown, bill and feet dark slate. 
SAYORNIS, Bonaparte. 
Sayornis, Bonap. ? Ateneo italiano, 1854 .—Ib. Comptes Rendus, 1854, Notes Orn. Delattre. 
Aulanax, Cabanis, Journal fur Orn. 1856, 1, (type nigricans.) 
Ch. —Head with a blended depressed moderate crest. Tarsus decidedly longer than middle toe, which is scarcely longer 
than the hind toe. Bill rather narrow ; width at base about half the culmen. Tail broad, long, slightly forked ; equal to the 
wings, which are moderately pointed, and reach to the middle of the tail. First primary shorter than the sixth. 
This genus agrees with the preceding in the length of the broad tail, hut has a longer tarsus 
and a different style of coloration. The species are distinguished as follows : 
Sooty black ; belly and edge of the tail pure white. S. nigricans. 
Brownish olive above; crown darker; beneath and edge of tail yellowish..AS'./«scws. 
Grayish brown ; belly reddish cinnamon. S. sayus. 
This genus I first find referred to by Bonaparte in the notice of Delattres’-collections, in 
Comptes rendus, 1854, where he names Sayornis nigricans. I am, however, inclined to believe 
that he has given a conspectus of the Tyrants in the Paris Ateneo italiano for 1854, and in it 
this genus. 
Cabanis calls the supposed 11 Tyrannula fusca” of Cuba Aulanax fuscus, and claims the “ T. 
nigricans” as type if Bonaparte’s name he untenable. 
Comparative measurements of the species. 
Catal. 
No. 
Species. 
Locality. 
Sex. 
Length. 
Extent. 
Wing. 
Tail. 
Tarsus. 
Middle 
toe. 
Its claw. 
Bill 
above. 
Along 
gape. 
Specimen 
measured. 
Remarks. 
7226 
Sayornis sayus . . 
Tejon valley..«... 
<? 
6.84 
4.00 
3.46 
0.80 
0.64 
0.22 
0.56 
0.82 
Dry........ 
...... .... 
7219 
Sayornis nigricans 
Sac. valley. 
<? 
6.82 
3.64 
3.54 
0.74 
0.60 
* 0.22 
0.60 
0.82 
Dry. 
4005 
.do. 
Cadereita, Mexico 
9 
6.60 
. 
3.32 
3.06 
0.66 
0.54 
0.20 
0.60 
0.80 
Dry. 
Poor spe- 
cimen. 
6.50 
11.75 
3.25 
Fresh. 
6 40 
3 32 
3.22 
0.66 
0.64 
0.24 
0.54 
0.72 
Dry. 
a 
3.24 
0.70 
0.60 
0.20 
0.54 
0.80 
Dry. 
7. 
11 . 
3.41 
3.26 
Fresh. 
Q 
6.40 
3.16 
0.66 
0.54 
0.24 
0.56 
0.82 
Dry. 
6 75 
10.83 
3 33 
Fresh . 
$ 
5.90 
3.30 
3.16 
0.70 
0.58 
0.22 
0.50 
0.74 
Dry. 
9103 
.do. 
Mexico. 
6.86 
. 
3.22 
3.30 
0.66 
0.56 
0.20 
0.54 
0.80 
Dry. 
