.|4<l ru()vi:i':niN<;s of tiik satiosm. musiam. voi..xxi. 



:il>I(i lor (■oMipiirlsoii, llu'it^ is<>hs«irviil>U"> lilllo, if ;iny, iiiii(,4'iiiil (lilVcreuce 

 in color abovo, Mi()ii;;h cerroen.sis ji|)|)oars to hit ratluT li;iliter. 



AlMioiijili the c-hanu'torH abovci }»iveii will Hcrvo to disciiiiiinato <7r- 

 roriisis, lil<^y can br (•(nisidciitMl only aviM-aji'd disl inclioiis, ami coiiso- 

 <liioiilly do not WiUTaiit I^o^^ lliaii snbspocilic rank, wliiidi stains it 

 scciniH lluM'cfoit'i ncM'cssary that (vr/Tor»,si.s' should occupy. Tho wido 

 (ciniinal band ol-^iay on the tail leathers ami lowoi' tail-covcrts, which 

 IMi-. Anthony r<'j;ards as a chaiactcr st^|>aiatin,n' th(^ ( Vmi-os Island liird 

 Iroin ('haricnlnriis, is a pni'cly individual variation, and consiMpu'Utly 

 of no diajiiiostic valuta Tlni sanjc nuiy bo siiid of the indistinctness of 

 [\\is barring on the <u'ntra.l rc^ctrici^s, whi(;h is obseivablo to a, ^icatei- or 

 less (^.\tent in all the Ibrins of tlu^ {i'cinus. Tlici wid^^ lateral arcias oC 

 (^ray in tlx^ type are appariMilly due in part to the nuike of the skin 

 and aie probably not of ninch diagnostic, importance, lor Homo S])Ocinu^ns 

 oi' cli<ui< iihinis ilr(^ v»My similar in this respect. 



'^lu^ present subspecies of //rvr/c/./Ms well dill'erentiated from I'lirjio- 

 VKiiK's hnricaiiihis l>y its conspicimiisly longer tail, lonji'cr win^', and 

 very much shorter cnbiMMi, aside from its somtnvhat paler upp«M' siirtiuro. 

 I<"'n)m ii<st>i>/iiliiN it may be distin^nisla'd by its much paler and less 

 rnlesctMit npjx^r snrliice, {grayer Hanks and sides, short »m- bill, and slightly 

 {iieat«'r lenj^t h (►! tail. It aA(M•a,^«^s also rather less in all its other meas- 

 urenK^nls. Tlu^ charai'tt"irs which st^parale (his tenia from Itiiroiiliriis are 

 the <larktM' npixM parts, rather nu)io deeply ji'ray Hanks, much shorter 

 bill, appriM'iably shorter win;; and tarsus. It diflers from ilrii»Ht<'its in 

 somewiiiit darker, much hvss rufescent. sides, Hanks, and n|»pei' surface, 

 less heavily barred crissum, shorter bill, and sli<;lilly shortin- win}^'. 



A May specinu^u is rather more j^rayish than the type, this bein};' 

 possibly du(^ to abiasion. Three other birds, when allowiince has been 

 msnU^ for lln^ir worn condition, ar«' but slightly dilViMent from the tyi)0. 



Fi\e specimens cxainini'd, ;i;ll from ('(^rl•os Islaml. 



THKYOMANKS INSULARIS (Lawrence). 



I'nxilDiljilcs inxuluris Law kknck, Ann. N. Y. \jyr. Nut. llisl.., 1S71, .\, j). U (ox 

 Itiiird, niiinuH(M-i|it). 



ClKtrs. sp. — Thryoiminos T. b. loucoi)hryi aHinia, sod alls (taiuhKino 

 brevioiibns, reetricibns fuscis utiimpu^ fas(^iatis, ncc lat(^ albido termi- 

 natis, strijiii. snperciliari nniji'is ri'stricta., corpore infra ochraceo lavato, 

 crisso macniato nee. fasciato, primo viau distinfiiuMidus. 



Mcanuremcuts {10 Hpveimcns). — VVin}»', 4(>.r> to 51 (averajj^e, 18.7) mm.; 

 tail, lli to 17 (avera{»e, 11.5) mm.; exposed culmen, 15 to 1(5 (averajjo, 

 15.2) mm.; bill iVom nostril, II to III (averajje, 11.5) mm.; tarsus, 1S.5 

 to 21 (averajic, !'.>.!>) mm.; middle t.o(^ with claw, 11 to 17 (averaifo, 

 15.1) mm. 



7'i//n' locdiilii. — Socoiro Island, western Mexico. 



(iC(Kir(q>liic (UnlriOidioH. — So(u)rro Island, weslein Rlo.xico. 



