208 FORMICARIID. 
year! These we now figure. It, with D. striaticeps, belongs to a section of Dysi- 
thamnus with mottled heads, the present bird being spotted, its ally striped over the 
whole surface of the crown. ‘The presence of D. puncticeps in Costa Rica is proved by 
a specimen in the national museum of that country from Pacuare °. 
3. Dysithamnus striaticeps. . 
Dysithamnus striaticeps, Lawr. Ann. Lyc. N.Y. vii. p. 130°; ix. p. 107°; Boucard, P. Z. S. 1878, 
p. 60°; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 115°; Scl. Cat. Birds Brit. Mus. xv. 
p- 228°. 
Supra cinereus, pileo et nucha nigro striatis, dorso postico, alis et cauda brunnescentibus, tectricibus alarum 
nigris albo terminatis: subtus gutture cinerea albo intermixta; pectore et ventre medio albis, illo nigro 
striato; hypochondriis et tectricibus subcaudalibus fulvo tinctis: rostro et pedibus plumbeis, illius mandi- 
bula pallidiore. Long. tota 4:5, ale 2:25, caudw 1:3, rostri a rictu 0-7, tarsi 0°75. (Descr. maris ex 
La Balza, Costa Rica. Mus. nostr.) 
Hab. Costa Rica, Angostura (Carmiol12, Zeledon *), La Balsa (Carmiol), San Carlos 
(Boucard *). 
A rare species, restricted in its range to Costa Rica, whence but few specimens have 
been sent. ‘The first of these formed part of the large collections made for the United- 
States National Museum by Carmiol and others, and was described by Mr. Lawrence in 
18651. Carmiol also sent us a male example, and M. Boucard obtained another 3. 
We have never seen a female of this species, but Mr. Lawrence describes it as having 
a bright rufous head, each feather with a narrow black central stripe. In other respects 
the sexes appear to differ very much as do those of D. puncticeps. 
MYRMOTHERULA. 
Myrmotherula, Sclater, P. Z. S. 1858, p. 234; Cat. Birds Brit. Mus. xv. p. 229. 
This is numerically one of the larger genera of Formicariide, containing some twenty- 
four or twenty-five species, which are divisible into several well-marked groups. The 
genus has a wide range over Tropical America, extending northwards to the forests of 
Northern Vera Paz, and southwards to the southern confines of Brazil, its focus being 
the valley of the Amazons throughout its length and Guiana. In Central America 
Myrmotherula is poorly represented by four species, not one of which is peculiar to the 
country. T'wo out of the four do not range beyond Costa Rica, and the fourth, the 
common MM. ménétriési, occurs in all the heavily-wooded country as far as Eastern 
Guatemala. No member of the genus reaches Southern Mexico. 
Of the sections into which Mr. Sclater divides the genus, the first, of which MW. surina- 
mensis is typical, is the most distinct. Besides the difference in the style of coloration, 
the bill is relatively longer and rather wider at the base, where the culmen is less 
elevated, the nostrils are situated a little further from the longest supranasal feathers, 
the hind tarsal scutella are more definite, and the tail shorter and squarer. 
