1. Harporhynchus crissalis, _Henry_. Cal., 11533. 2. “ cinereus, _Xantus_. C. St. L., 26343. 3. “ lecontei, _Bonap._ Ariz., 40718. 4. “ redivivus, _Caban._ Cal., 3732.] Harporhynchus crissalis, HENRY. RED-VENTED THRASHER. _Harporhynchus crissalis_, HENRY, Pr. A. N. Sc. May, 1858.—BAIRD, Birds N. Am. 1858, 350, pl. lxxxii; Review, 47.—COOPER, Birds Cal. 1, 18. SP. CHAR. Second quill about as long as the secondaries. Bill much curved; longer than the head. Above olive-brown, with a faint shade of gray; beneath nearly uniform brownish-gray, much paler than the back, passing insensibly into white on the chin; but the under tail-coverts dark brownish-rufous, and abruptly defined. There is a black maxillary stripe cutting off a white one above it. There do not appear to be any other stripes about the head. There are no bands on the wings, and the tips and outer edges of the tail-feathers are very inconspicuously lighter than the remaining portion. Length, 11 inches; wing, 4.00; tail, 5.80; tarsus, 1.25. HAB. Region of the Gila River, to Rocky Mountains; Southern Utah (St. George, Dr. Palmer). A second specimen (11,533) of this rare species is larger than the type, but otherwise agrees with it. Its dimensions are as follows:— Length before skinning, 12.50; of skin, 12.50; wing, 3.90; tail, 6.50; its graduation, 1.45; first quill, 1.50; second, .41; bill from forehead (chord of curve), 1.65, from gape, 1.75, from nostril, 1.30; curve of culmen, 1.62; height of bill at nostril, .22; tarsus, 1.30; middle toe and claw, 1.12. The bill of this species, though not quite so long as in _redivivus_, when most developed, is almost as much curved, and much more slender,—the depth at nostrils being but .22 instead of .26. The size of this specimen is equal to the largest of _redivivus_ (3,932); the tail absolutely longer. The feet are, however, considerably smaller, the claws especially so; the tarsus measures but 1.30, instead of 1.52; the middle claw .29, instead of .36. With these differences in form, however, it would be impossible to separate the two generically. A third specimen (No. 60,958 ♀, St. George, Utah, June 9, 1870), with nest and eggs, has recently been obtained by Dr. Palmer. This specimen, being a female, is considerably smaller than the type, measuring only: wing, 3.90; tail, 6.00; bill, from nostril, 1.15. The plumage is in the burnt summer condition, and has a peculiar reddish cast.