GUIRACA.—ORYZOBORUS. 347 
This bird, as already stated, differs from G. concreta in the colour of its plumage, 
which is of a clearer blue shade, the forehead and cheeks being of a still paler colour. 
It was originally described by Lafresnaye from Panama specimens, and it has since been 
traced southwards through Colombia*® to Western Ecuador 6. 
4. Guiraca parellina. 
Fringilla parellina, Licht. Mus. Berol.’ 
_ Cyanoloxia parellina, Bp. Comp. Av. i. p. 502”. 
Goniaphea parellina, Scl. P. Z. S. 1856, p. 302°; 1857, p. 2284; Baird, Mex. Bound. Surv. ii. 
Birds, p. 17°. 
Cyanospiza parellina, Sumichrast, Mem. Bost. Soc. N. H. i. p. 551°. 
Guiraca parellina, Scl. P. Z. S. 1859, pp. 3657, 378°; Lawr. Bull. U.S. Nat. Mus. No. 4, p. 20°; 
Mem. Bost. Soc. N. H. ii. p. 276°; Boucard, P. Z. S. 1883, p. 444. 
G. concrete et G. cyanoidi affinis, sed multo minor; fronte, genis, uropygio et tectricibus alarum minoribus leete 
eeruleis. Long. tota 4:8, ale 2°7, caude 2:2, tarsi 0°7. (Descr. maris ex Jalapa, Mexico. Mus. 
nostr.) 
2 fusca, subtus dilutior, gula et abdomine medio fere albicantibus, alis et cauda fusco-nigris. (Descr. femine 
ex Mazatlan, Mexico. Mus. nostr.) 
Hab. Mexico? 4, Sierra Madre, Nuevo Leon (Couch®), Presidio, near Mazatlan (Forrer), 
Manzanilla Bay (Xantus 1°), State of Vera Cruz (Sumichrast ®), Alvarado (Deppe 2), 
Cordova (Sallé*), Jalapa (de Oca"), Totontepec ®, San Andres Tuxtla 4 (Boucard), 
Tehuantepec City, Huallago (Suwmichrast °), Merida in Yucatan (Gawmer "). 
This is a miniature form of the South-American G. cyanea, and more closely related 
to it than to G. concreta, which, like G. parellina, is a Mexican bird. The first speci- 
mens of this species which were sent to Europe were probably those obtained by Deppe 
at Alvarado, in Mexico, and which remained under a MS. name of Lichtenstein’s until 
Bonaparte described them in 1850. It has since been found nearly everywhere in the 
hotter parts of Mexico, from the Northern States of Nuevo Leon and Sinaloa to 
Tehuantepec and Yucatan. Hardly anything has been recorded of its habits; and 
Sumichrast merely remarks that the limit of its upward range does not exceed about 
2600 feet °. 
ORYZOBORUS. 
Oryzoborus, Cabanis, Mus. Hein. i. p. 151 (1851). 
In this genus are included several species allied to Spermophila, but with much 
stouter bills. ‘They are spread over tropical America from Southern Mexico to South 
Brazil, but are absent from the Antilles. Two species occur within our limits. Some 
of the forms are not very definite, and we have little doubt that of the species now 
recognized several will have to be withdrawn. The characters upon which their 
distinction is based are decidedly variable, especially as regards the size of the bill. 
44* 
