110 PROCEEDINGS OF THE ACADEMY OF 



Elaps mipartitus Dum. Bibr. 



Four specimens from Guayaquil, and one from the valley of Quito. 



EliAPS IMPERATOR Cope, Sp. UOV. 



This is a species of the E. c o r a 1 1 i n us group, and is nearest to the series B. 

 II. a. y. aa. of Gunther's synopsis of individuals of this genus ;* or to the E. 

 o rn a t i s s i ni u s of Jan. It differs from the latter and from all others, in 

 that the black bands are wider than the red and cease at the third row of 

 scales, not extending on the first two, or on the gastroteges. The two rows 

 are margined with black on a yellow ground. Black bands T-5, red ones 5 

 scales wide ; scales in the latter, of the first row, narrowlj-, of the two following 

 broadly tipped with black ; the remaining dorsal series entirely black or with 

 a faint basal shade of red. Yellow margins on half scales alternating. The 

 red bands cross the belly on two and a half gastrosteges. Top of head and 

 nape black, except outer half of internasal and prefrontal plates, which with 

 the labials are yellow. Labials black edged, not in contact with temporals, 

 which are yellow edged at bases. Lower lip, rostral plate, chin and belly un- 

 spotted, yellow. Two postoculars, Gastrosteges 225, anal 1 | 1 : urosteges 37. 



Total length 2 ft. 3 in. 4 lin. ; of tail 2 in. 7 1. 



From the Napo and Maranon ; one specimen. 



It is difficult to imagine a more elegantly colored species of this beautiful, 

 but venomous genus. Dr. Giinther has shown the inconstancy of colors in some 

 species of the genus. Within certain limits the species are very constant, as I 

 have had occasion to observe in numerous specimens of E. lemniscatus, E. 

 elegans, E, mipartitus, E. nigrocinctus, E. euryxanthus, E. fulvius, etc. 



SOLEJVOGLFPHA. 



Tbleuraspis nitida Cope. Lachesis nitida Giinther, Proc. Zool. Lond., 1859. 

 From Guayaquil. 



Trigonocephalus brasiliensis. Bothrops jararaca Wagl. Craspedocephalus 



Gray. 



Three specimens from Napo and Upper Amazon ; the smallest with fifteen 

 urosteges behind the vent, undivided. 



Trigonocephalus xanthogrammus Cope, sp. nov. 



Form rather elongate ; head elongate, muzzle short. Scales of body in 

 twenty-seven longitudinal series, not strongly keeled, the dorsal narrow, those 

 of the first row ovate, longer than broad. Scales of the whole top of the head 

 small, smooth, nine or ten rows between the large superciliary shields. Four 

 elongate plates in a row on top of the end of the muzzle, which are bounded 

 behind by four much smaller ovate ones. Superior labials seven, the second 

 bounding the pit anteriorly ; the last five large and of nearly equal size, infe- 

 rior labials eleven, the two anterior broadly in contact in front of geneials. 

 Two preoculars are loral, two nasals ; rostral elevated. Gastrosteges 196, 

 urosteges 54. 



Color above very dark olive, with a zigzag yellow line on each side from the 

 head to the origin of the tail, the apices of the open Vs usually meeting on 

 the vertebral line, enclosing dorsal rhombic spaces and lateral triangles. The 

 bases of the triangles embrace seven or eight transverse series of scales. 

 Gastroteges black, paler medially, with yellow irregular spots at their extrem- 

 ities. Gular region, chin, and superior labials bright yellow ; a bright golden 

 band round the end of the muzzle, involving the greater part of the sui)ercil- 

 iary plates, passes to the nape, and is bounded below by a black band from eye 

 to angle of mouth ; top of head black, with a pair of undulating yellow bands 

 from the nape which meet on the vertex forming a V. 



* Ann. Magaz. N. Hist., 1859, 171. 



[March, 



