220 Proceedings of the Biological Society of Washington. 



(1) Aporophis melanocephaliis Griffin (1917 Mem. Carnegie Mus. 

 vii, 3, p. 171) which is clearly a synonym of Rhadinea steinbachi 

 Boulcnger (1905, Ann. Mag. Nat. Hist. (7) xv, p. 454), both snakes 

 coming from Bolivia and both collected by the same man. 



(2) Liophis atahuallpae Steindachner (1901 Anz. Ak. Wiss. Wien, 

 p. 195) from Ecuador is, according to Boulenger in the Zool. Rec. for 

 1901, a synonym of Rhadinea undiddta Wied (1825 Beitr. Nat. Bras. 

 I, p. 329). 



Tachymenis surinamensis, sp. n. 



Type.~M. C. Z., No. 5123, Surinam. 



Ventrals 196, anal divided; caudals 98; scales 19; total length 417 mm.; 

 tail 113 mm.; eight upper labials, 4th and 5th entering eye; one pre- and 

 and two postoculars; temporals 1-1; frontal very long and narrow, no 

 broader than supraocular, longer than parietals, much longer than its dis- 

 tance from tip of snout; loreal longer than high. Color, (faded) very light 

 above and below ; a black dot on end of each ventral and one at tip of each 

 scale in row one; second, third and fourth scale rows rather peppered with 

 tiny black specks; a black dot on about every third scale in row four, 

 larger black dots on about every third scale in row eight, on the neck these 

 last fuse in pairs across median line and there is an elongate dark blotch on 

 the middle five scale rows just back of the parietals; a light, dark bordered 

 line along the frontal; a dark band from nostril through eye continuous with 

 the slightly darker scale rows 2, 3 and 4; behind the eye on the labials this 

 line bordered with black below; a dark spot below eye on fifth upper labial; 

 lower labials and throat sprinkled with darker. 



A second specimen with same data has ventrals 200, anal divided, 

 caudals 89, total length 300 mm.; tail 75 mm. The upper series of dots on 

 the back is on the seventh row; the marking on the frontal is not visible 

 and the subocular streak extends from eye nearly to lip across fifth and sixth 

 labial. 



Related to Tachymenis elongata Despax from Peru. But elongata has 

 scale pits; the parietal is as long as the frontal; the temporals are 1-2 and 

 tfif' coloration, wliile generally similar, differs in detail. 



I am in some doubt as to whether the generic assignment of this snake 

 is correct. It agrees with Coniophanes in the absence of scale pits and in 

 the round pupil, but it is evidently closely allied to Tachymenis elongata. 

 It is somewhat doubtful whether Coniphanes and Tachymenis can be kept 

 apart. Tachymenis is the older name. 



