fiSG LARUS DELAWAKEN8I8, RING-BILLED OXTUj. 



organization, woakcr 1»i]l, &c., it hIjouh an evidont approach to the "Mcv. fInllH" 

 (delawarimxiH, caniiH, &(;.), and apparently connectH the latter n'onp wit li lar(;(;r llcrring- 

 GiilJs with ll(-hl]-f;oloi(!(l fci;t. But tho lialjility to error in Kiving thi- colorH of the U-vt, 

 &c., of water hirJs, is very great; Mr. Lawrence! liirnHclf (li. N, A. p. H4()) Hinting lh;i,t 

 the legH are " flcuh-colored," although their tint wan corn^ctly giviii by hiiu wlieji 

 introducing the species. 



For a iiion; i-xteiiHlvo discnssion of t,h(! point, I rc.U-.r to my piiper in the I'hlladc.lphia 

 Academy " I'roiiwdings." Wliile it, is proljable l.lial, Ricbardson's name i<;li;rH to tlio 

 species described by Mr. L.-twrenni!, I liy no means insist nporj this iderilifi(;;ilJoii, nor 

 would wish to 8n|>i',r»itdc, the n.'irrii: enlijorriiciiK. 



Comparison of L. californifuv ir/i.tli. the, liuriiiimii L. ariientattiH. — 'I'ho termifjiil tnaiklngs 

 of thi- primaries of tho two iiie identical, arid in sizii thesficcies iire not vi ry dissiniilur. 

 Thi! color of till; f(ti-t is strikingly divcu-He fdnsky gieenislj iji oalifiirninm ; ib'Hli-colori-il 

 in arr/f.ntataii) ; and the picture of the liam-H of tiic, i)iirn:irii-H very difliTent, as follows : 

 In eai(/ornic«« the bluish color is very light in tint, in fact alnrost whilr; teriniicdiy ; 

 extends very far along l.hc! feathers (espi-ei:illy on the lirst quill), its edge parallel with 

 the rhachis for nearly its whole length, and then it turns suddenly off at an acute 

 angle, running up nearly as far on the eilge ri.s in the centre of the iimcr VMue of the 

 feather. In rirr/i-jilahii the color is but little, if any, lighter than the nuintle; it ex- 

 tends along the feather with an outline ohliijue to the shaft ; runs np nnuli further in 

 the centre of the inner web than along its edge, alorjg which latter the black dc^wM-rids 

 a little way as a narrow ifjarginal line. In cdliforniciiH the line of demareatiou of tho 

 two colors is njuch more trenchantly marked than it is in aryeniatun. 



LARUS DELAWAREXSI8, Old. 



Bing-btlled Gull. 



Xarus delairarenhiH, Out), Guthrie's Geog. 2<{ Am. ed. ii, \Slf>, 'M'.t. — Lawk., IS. N. A. l^^FiR, 

 fc4(;; Ann. Lye. N. Y. viii, Irffii;, ^9:) —Coot-. &, .St(;K„ N. H. Wash Tcr. It-{i(), 

 273.— Wlii'.Ai., Ohio Agrie. Itep. IWiO, No. 267,— O.CKS, I'r. Phila. Aciid. Hdl, 

 246; 1862, ;iO:i.~(Joi,|,„s, Smiths. Ke|>. Ifiol, 418 — Vjoitn., Pr. Ess. Inst, lii, I'-iW, 

 160.— IJu,M!i)M., J'l. lio.st. ,Soc. ix, 186^, i:!l.— Hem,., .\IUfi. I'.-B. iv, IWi:',, Lari, ji. 

 22.— AiJ.L.v, I'r. Ess. Inst, iv, 1861, riO,— (Joi.ks, I'r. I'.o.st, .Soc. xii, IWi-j, \-m;.— 

 'I'l i:,\n., h. K. Pa. l-^ri'.i, :W.— (;or;i,s, Pr. X'hila. Acad. 1^,71, liy.—Oni'.,',, Key, 

 187:^, ;il:j.— i;iii(;w., Ann. Lye. N. Y, x, 1874, ;W (Illinoi.H;. 



Larun imiiuh, I',v., .Syn. 1828, 259. Not of anthors. 



Ldrim zoiiHrhijiinkuH, KiCd., F. I). A. ii, 18:il, 421. — ,\r;TT., Man. ii, 18;'.4, ;S00. — A(:i>., Orn. 

 Biog. iii, 18:',.j, 98 ; v, I8:i9, 6:i8 ; pi. 212 ; Syn. 18:i9, :W7 ; 1!. Auj. vii, 1844, 1.'.2, pl. 

 446.— Gn:., J). L. I. 1844, •MVI.—iii:, Compt(« Kendn.s, 1856, 771 ; (Jon.sp. Av. ii, 

 18.'j6, 224.— liLAS., J. f. O. 186.'., •.',r;(l. 



Larut zonorlii/iiikiiii var. hnichii, Hi'., Gonsp. ii, 18.')6, 224. 



Larun zoiiorhijnihuH var, riKMcaiiuM, Bp,, Gonsp. ii, l8,'j6, 224. 



CrlauimH z<in(jrliiiiii:hiiH, lilM.cn, J. f. O, 18.')ii, 102. 



Oariiia zonorhijtiduj,, IJi-., .\anm. iv, 18.")4, 2IU.—finx:(:u, .J. f. 0. 18/,.',, 282. 



Gar/iKU hruchii, Br., .Nuuru. iv, l8.'il, 2^)2. — IU:i:<:u, J. f. O. 18,v'i, ii'^.'-i. 



DiAf>, L. ronlro vigrocincU/, pallio i:i/rukii-perLaiu:o, rcmiiji; priruo Hpatio huhapicaliatbft, tano 

 diiiilo medio lour/ion;. 



Hah. — North America generally; throughout the int^^rior Jis well as coastwise. Cnba 

 (Cah,, J. f. O. v, 2;;6j. 



Adult in KunirnfT. — Bill rather sfcont, as long as the middle toe and claw ; the npper 

 mandible considerably corjvex at the end; under nianilible much thickcnci at the 

 angle, which is prominent ; the outline from base to angle, and fronj arjgle to tip, both 

 concave. Middle toe and claw .icari:ely more than turee-fourtbh the tarsus. Ii,ll 

 grccni.sh-ycllow, at tip chrome, encircled at the angle with a broad band of black, 

 Jjcgh and feet dusky bluish-green. .Vlajjtle light pearl-blue, fading into white at the 

 end.s of the .secondaries and tertials, the line of demarcation indistinct. Priniaiies: 

 first black, the basal [KJi-tion of the inner wi^b very light bluish- white, almost pnn-, 

 with a spot of white alwnt 1.2.') inches long near the end^ of etjnal extent on Wolh webs, 

 divided by the black shaft ; second with a small w hitx; S[Mit on the inner web, and the 

 inner web whitish at base, for a longer distance ; the whitish of the bases of the jirirna- 

 rJes regiilaily increasics inward and the black dccrcas<;s, until on the ,sixth it is merely 

 a transver.se bar. Apex of first pi imar,y black, of others white, the sjMit being very 

 minute on the second, and gradually increasing; seventh Jind innermost primaties 

 without any black, like tlie secondaries. 



Adult in iriiitfi: — As in sumiucr, but the h«a<l and neck behind spotted (not streaked 

 nor nebulatedj with dusky. 



YoijiiOjfirnl ii:iiil.er. — IJpiier parts irregularly motthjd with dusky brown and the pearl- 



