426 BULLETIN 195, UNITED STATES NATIONAL MUSEUM 



George) ; central Arizona (Fort Whipple, Camp Verde, and Pinal 

 Mountains) ; and southern New Mexico (Carlisle, Cliff, Bosque del 

 Apache, Tularosa, and Carlsbad). East to southern New Mexico 

 (Carlsbad) ; western Texas (Guadalupe Mountains, Glass Mountains, 

 Marathon, and Boquillas) ; southern Coahuila (Saltillo and Diamante 

 Pass) ; and Hidalgo (Portezuelo). South to Hidalgo (Portezuelo) ; 

 southwestern Texas (Lajitas, Chisos Mountains, and Fort Hancock) ; 

 northern Chihuahua (Colonia Diaz) ; and northern Sonora (Guay- 

 mas). West to northwestern Sonora (Guaymas, Rancho Costa Rica, 

 and Kino Bay) ; northeastern Baja California (El Valle de la Trini- 

 dad, west side of the Laguna Salada, and Gardners Laguna) ; and 

 central southern California ( Alamorio, Martinez, and Palm Springs) . 



The entire species as outlined has been divided into three subspecies 

 or geographic races. The crissal thrasher {T. d. dorsale) occupies the 

 range in the United States and northern Mexico from Chihuahua to 

 extreme northeastern Baja California; the Trinidad thrasher {T. d. 

 trinitatis) occurs in El Valle de la Trinidad between the Sierra Juarez 

 and the Sierra San Pedro Martir ; another race occurs in Mexico. 



Egg dates. — ^Arizona : 88 records, February 18 to July 3 ; 44 records, 

 April 2 to May 21, indicating the height of the season. 



California : 56 records, February 10 to June 10 ; 28 records, March 

 11 to April 6. 



Baja California : 6 records. May 8 to June 10. 



TOXOSTOMA DORSALE TRINITATIS Grinnell 

 TRINIDAD THRASHER 

 HABITS 



Dr. Joseph Grinnell (1927a) described and named this thrasher, 

 based on a series of six specimens collected by Chester C. Lamb in the 

 Trinidad Valley in northwestern Baja California. He says that it is 

 similar to the crissal thrashers of California and Arizona, "but bill 

 longer and distinctly more curved (as seen in lateral profile), and 

 tone of coloration darker, more slaty. This latter qualification applies 

 to both upper and lower surfaces, and particularly to the wings and 

 tail, which are between fuscous and fuscous-black (of Ridgway, 1912) , 

 rather than near mummy brown. The bill, feet and claws also aver- 

 age blacker." 



This subspecies evidently is isolated in a very restricted range, for 

 he says that it is known only from the vicinity of the type locality 

 in the Trinidad Valley. "This is a rather extensive, east- west valley 

 which separates the Sierra San Pedro Martir immediately on the south, 

 from the Sierra Juarez on the north. The Trinidad Valley is thus 

 part of an intermountain pass, and through it many desert-side plants 

 and animals have gone more or less distance onto the Pacific side, and 



