COLLUUIO EXCUBITOROIDES. 453 



COLLUIUO LUDOVICIANUS. 

 Soiillicrii Slirikc 



ft. excuhitorokles — White-rumpcd Shrike. 



Lanius excubitoroides, Swainson, Fauna Bor. Am., II, 1S31, 115, pi. 35. 

 Volhjr'w cxvubitoruidcs, Baikd, B. N. Am., 1858, 5L'7, pi. 75, fig. 2 ; Cat. N. Am. B., 



1859, No. L>38. 

 Collurio crcubitoroUlcs, Baiud, Eeview Am. B., 186G, 445. — Cooi'KR, Orn. C.il., l.'JS. 

 CoUurio hidoiicianus var. cxaibitoroidcs, CoUES, Key, 1872, 125; Check Li.st, 187."{, 



No. 135a.— B. B. & If., ni.st. X. Am. B., I, 1871, liM. j.I. xix, (ij,'. 3.— Dkn- 



8IIAAV, 1875, 233. 



Scarcely a locality was visited where this Shrike was not found, in 

 greater or less plenty, its range including both the Sacramento Valley and 

 the country eastward of the Sierra Nevada. At Sacramento it was frequently 

 observed about the outskirts of the city, where it frequented the oak-groves 

 and scattered trees, or the borders of the fields. In the Interior it was most 

 common at those localities where there was a greater or less extent of willow 

 thickets, Avith meadow-lands and sage-bru.sh adjacent; but it was not rare 

 on the higher mountain ranges, where it inhabited the mahogany and cedar 

 groves in preference to other places. It was most usually observed perch- 

 ing quietlv on the summit of a dead weed-stalk or prominent naked branch 

 of a bush or tree, patiently watching for its food, or during its curious 

 undulating flight, so strikingly characteristic of the species of this genus. 



List of specimens. 



15G,<?j«i-.; valley of tbe nuiuboldt (Camp 17), September 2, 1807. 0— 12A— 3]|— 

 ^^^ — 1^ — 1 — 2,^^.-. Bill, slaty borii-black, basal portion of lower maiulibk' paler; iris, 

 brown ; tarsi and toes, black. 



Sii-juv.; cotton-woods of Carson River, Fort Churchill, Nevada, December fi, 1S07. 

 0^— 123— 4— .3^— ji— 1— 4— 2^. Bill deep black, lower mandible paler basally; iris, 

 brown ; tarsi and toes, black. 



442, <? ad.; Canson City, Nevada, March 10, l!-^G8. <ij_1.3— 4i— .3^. Bill, pure 

 black; iiis, bister; tarsi and toes, black. 



482, <? ad.; Carson, April 2, 1808. 91—134—4/5—3^7;.. Same remarks. 



524, (? ad.; Carson, April 24, 18C8. 9— 13— 4J— 35. Same remarks. 



849, ? ad.; East Uumboldt Mountains, Nevada, July 21, 1808. (Mahoganies; 

 altitude 9,000 feet.) 9i— 13— (.')— 3<;. Bill, pure black; inteiior of mouth, livid ll<-sliy- 

 wbite ; iris, bister; scntella? of tarsi and toes, pure black, the interspaces dirty white. 



889, juv.; East UumbokUMouutaius, September 4, 1808. BJ— 12i— (f)— -TfV Bill, 



