1014 REPORT OF NATIONAL MUSEUM, 1898. 



Color in longitudinal bands; the vertebral dark brown, five scales 

 and two half scales in width, extending over the head to the upper por- 

 tions of the rostral and labials; the first laterals of yellowish brown, 

 from the occiput, two half scales wide; the second of dark brown, two 

 scales and.two halves; the exterior of brownish yellow, two scales and 

 a half. The darker lateral edges of all the scales give the api)earaiice 

 of narrow stripes. Abdominals, subcaudals, lower part of head, upper 

 labials, and rostral dull yellow or straw cglor. Without spots. It is 

 likely that in life the dark bands were purplish or bluish and the light 

 flesh colored. 



Liodijtes allenii Garman. 



EUTyENIA Baird and Girard. 



Eutcenia Cope, Proc. Amer. Phil. Soc, 1886, p. 495. 



JEutainia Baird and Girard, Cat. N. Amer. Rept., Pt. 1, Serp., 1853, j). 24. 



Thamnoplds Fitzinger, >Syst. Rept., 1843, p. 26. 



Prymnomidion Cope, Proc. Acad. Nat. Sci, Phila., 1860, p. 558. 



Chilopoma Cope, Rept. Expl. 8urv. W. of 100 Mer., V, 1875, p. 543 (preoccupied). 



Stypocemus Cope, Proc. Amer. Phil. Soc, 1875, p. 887; Bull. U. S. Nat. Mu8.,No. 

 32, 1887, p. 60. 

 Cephalic jilates normal; two nasals, one loreal. Eye resting on 

 superior labials. Scales keeled, without pores. Anal plate entire; sub- 

 caudals divided. The maxillary teeth are rather abruptly longer near 

 the posterior extremity of the maxillary bone than elsewhere, as in the 

 genus Natrix, with two exceptions. These are the species E. multimac- 

 nlata Cope and E. melanogaster Wiegmann. I have on this account dis- 

 tinguistied these species as constituting another genus which I called 

 Atomarchus, the character distinguishing it from Eutamia being the 

 equality in length of the maxillary teeth. As the excess in length of 

 the posterior teeth is small in some of the species of the latter, I have 

 not for the present retained this genus, although it may be found to be 

 advisable to do so hereafter. The two species mentioned are more 

 aquatic in their habits than the EutiTBuite proper. 



This genus was established by Baird and Girard in the Catalogue of 

 Serpents of North America, published in 1853, on species which had 

 been previously referred to the genus Natrix (Tropidonotus). To the 

 three species previously known these authors added four; and nine 

 names were proposed for what are in my estimation either subspecies 

 or individuals of the seven species actually distinguished. In the year 

 1800 Keunicott added five species. At various dates between 1860 and 

 1885 the present writer added nine species, and referred to the genus a 

 species long previously described by Wiegmann. In 1890 Brown added 

 a species, and a species is described for the first time in the present 

 review. The total number of si^ecies is, then, twenty-four. 



