VOL 



'so^^i^'] PROCEEDINGS OF THE NATIONAL MUSEUM. 735 



The scale rows ou the middle of the body number 25. 



The coloration above is pale drab, tlie margins of the scales being 

 paler, the underside uniform pale bufit"; rouud the neck a single broad 

 bluish black collar covering 12 gastrosteges and about as many scales 

 on the vertebral line, starting on the fifth gastrostege and on the sixth 

 vertebral scale from the parietal. A spot of similar bluish black below 

 the eye, but not reaching the commissure. 



Atractaspis rostrata Gi'XTHER. 



One specimen (Xo. 20127) from Wange, Island Manda, collected by 

 G. Deiihardt; 23 scale rows. 



C'ausus ihombeatus (Licut.). 



Two specimens (U. S. Nat. Mus., Nos. 16757, 10758) collected by Dr. 

 Abbott at Kilinia Njaro, in poor condition. They have 19 scale rows; 

 normal rostral; internasal broadly in contact with loreal; large dark, 

 white margined spots on the back. For these reasons I refer the species 

 to C. rhomheatus, of whicjh I have no authentic South African specimen 

 at hand for comparison; but Abbott's specimens agree well with tlie 

 type of Halloweirs C. maciUaftis, except that in the latter the rhombs 

 are more distant, and the angle of the black cephalic chevron more 

 acute. It will be observed that Peters has already recorded the species 

 from Taita (Monatsber. Ak. Wiss. Berlin, 1878, p. 207). 



Causus nasalis, s]). uov. 



Diagnosis. — Nineteen scale rows; rostral produced, but forming no 

 ridge above; internasal not in contact with loreal, being excluded by 

 the prefrontal which is in contact with the posterior nasal; anal single; 

 back with narrow, more or less distinct chevron cross-bands having the 

 angle turned backwards. 



Habitat. — Trojncal Africa. 



Type.— JJ. S. National Museum, No. 10055, S ; West Africa; W. H. 

 Brown coll. 



Eemarls. — In the form of the rostral the present species seems to be 

 vsomewhat intermediate between Causm rhomheatus and C. resimm (both 

 species with 19 scale rows), it being more pointed and prominent than 

 in the former, though not to the same extent as in the latter, which is 

 described and figured (Monatsber. Ak. Wiss. Berlin, 1802, p. 277, pi., 

 fig. 4) as having " das Itostralschild vorspringend mit aufgestiilpter 

 Krempe," From both of these, however, it differs iu the relation of the 

 internasal to the loreal, the posterior outer corner of the former bending 

 down behind the posterior nasal in the two old species, while in the pres- 

 ent one it is considerably shorter and not meeting the loreal at all. The 

 cross-bauds on the back of C. n<(salis show a style of pattern entirely 

 ditterent from that of C. rhoiiihratvs: The type of C. rcsiiHus appears 

 to have been uniform on the back, but it is possible that young speci- 



