VOL. XI 

 1*91 



!'•] lMM(i:i;i.l.\(iS ov TllK NATIONAL Ml'SEUM. ♦ilT 



Diadophis punctalus I. inn. 



H(l. aii(K;ii(l.,Cai. Ir'o.i, p. IPJ, Xo. 1. Cope, Cht-i-k IAhI IJatr. aiwl IJ.'pt., lH7r>, p. :\7. 



Culnbtr i)iiit<latii8 L'iu\w,^ys{vm:i i\;itmn-,t. i, i>. :{7(i ; Latrcillo, Hi.st. iiat. «li-s. n-pt., 

 t. IV, part 2, p. l:5(); (iuiclin, Liii. Syst. Nat., t. i. part I!, p. lOS'.l ; Daiitlip, llmt. 

 iiat. (les iL'pt., t. VII, p. l/H, Lai-.'p., ii, p.2»7; IJoniiat. Opliiol., \k Id; Moir. T.nt., 

 p. i;5(); Harlan, Jouiii. Acad. Nat. .Sti. I'liila., l.s-27, p. :t.'.-J ; ami M.d. VU\>*. 11,h., 

 IK}.'>, p. 117; Storrr, Kipoils, ld:U) p. -Jjri; Molhr., N. Anit-r. II. i ).<•(., 1-IJ, m, t. H. 



\atrix 2yiincttttit8 Merroin, Tentameii, p. \'M\, spec. ][K\. 



IloDKtloaomn jiiDirtalinii Waylor, Sy.st. dcr Aiiipli., l-^iU), p. l.ll. 



Sj)ilt>irx piiiicl(tli(» t^\\i\\i)8oi\, Cyclopod. K'rpt., ls;',i», p. ikm. 



(.'alamarUi punclata Sclilcf^cl, Era., 18:i7, t. i, ji. \'.\'2\ 1. ii. ]t. 'Mi. 



Abhtbcs 2)itnctatiis Diimdrijet Hibroii, Eip. Cen., iH.'il. t. \ ii, part i. p. :tlO; (iiiiitlior 

 Cat. Col. Snakes Ilrit. Mns., ls:)S, p. -JS. 



Coluber ti>rijiiahin Sliaw, (Jon. Zoi31., If^Ki, t. in, p. ;"):{. 



Dia(lo}>lii!i difnopcs Cop«', Pvov. Acad. Pliila., IHiO, '>'>[. 



Eastern ami Auvstroripariaii ro{:ifion.s excei>t Texan District. 



HYPSIGLENACopr. 



Proc. Acad. Pbila., i-tm, ,hiuc, p. -Jlo; IJuH. IJ. 8. Nal. .Mu.scinn iij, l-"7, p. ;.4; 

 I'svitdodipHaH Vi'U'rs, Monat.slier. PriMi.s.s. Akad. Wiss,, IMIU, p. .VJ rOi fdli.i i. r,>. 

 mattes, .Jan. Elenco Sistoniatico Ophidi, IHGIi, p. l(i;i. 



Dentition iliacranterian ; /. <., a long, .smooth, posterior maxillarv 

 tooth, separated from the anterior by an edentulous sj)ace. I'npil ellip 

 tic, erect ; head distinct, broad posteriorly ; body cylindrical. Cephalic 

 shields normal. Two nasals, nostril between ; onelorcal; two pre- ami 

 two posloeiilars. S(;ales smooth, (lastrostej^es not angnlated. Anal 

 ami snbcandal scutella divided. Tail not elonj^ate. 



This genus includes four species of Central America, Mexico, and 

 parts of the United States adjacent to the latter. They are of snniU 

 size and resemble considerably the more robust si)eciesof Sibon. Their 

 vertical pupil indicates that they are of nocturnal habit. 



But one species enters the limits of the United States. 



Hypsiglena oclirorhyncha Cope. 



Troc. Acad. Phila., ISdO, p. 'Jltl; Ilypniylvna chloroplto'a Cope, loc. cit. Com<uie>i quin- 

 ciiticiatit8, Jan, Icon. Geu. Ofid., it, :{-* I, Fig. 1. 



Sonoran, and Lower Californian regions; Chihuahim. 



PHYLLORH5fNCHUS .StoJ!io;,'cr. 

 Proc. U. 8. Nat. Miis., IH'J ', p. ir>l. 



Head slightly distinct, short; tail short: palatine teeth present; den- 

 tition diacranterian; rostral i>late greatly ndarged, with frrt' lateral 

 liorders and produced backwards so as to separate the supranasals 

 entirely; anal undivided; no scale pits; pupil vertit-al ; two nasals; 

 loreal present ; supralabials not in contact withorliit: one |>air ofge- 

 nials only. 



This genus is a curious example of tho.se snakes in which tin- rostral 

 shows a most extrordinary development. In the present instance thi.s 

 shield resembles a thick leaf loosely attached to the front of the snout 



