TRIMERESURUS 285 



first small, triangular, narrowly in contact with rostral; second 

 high, reaching almost to canthus rostralis ; third much the largest, 

 broadly in contact with subocular; fourth and fifth scales each 

 separated from subocular by a single scale; temporal scales dis- 

 tinctly enlarged, larger than or as large as posterior labials ; 

 mental broadly triangular, wider than rostral; 11 lower labials, 

 first, seventh, and eighth largest; a pair of large chin shields, 

 much longer than wide, broadly in contact, bordered by 3 labials ; 

 •5 pairs of scales between chin shields and first ventral ; 28 scales 

 from angles of mouth across occiput; 13 scales between supra- 

 oculars; 29 scale rows on neck (at seventh ventral) ; 21 rows 

 on body; ventrals, 175; subcaudals, 56; anal single; temporal 

 scales . perfectly smooth ; body scales slightly keeled on the 8 or 

 10 median rows ; head rather angular, flattened above, and de- 

 pressed in supraocular region ; tail prehensile. 



Colo7' in life. — Above, bright yellow with a darker yellow 

 lateral streak (in alcohol entire snake almost paper white with 

 practically no trace of marking) ; tail with a few small, reddish 

 bro'wni spots near tip. 



Measurements of type and ootype of Trhneresurus mcgregori Taylor. 



Total length 



Tail . ' 



Head width 



Head length 



Eye to end of snout 



Eye to mouth 



Supraocular width 



hength of eye 



Width of eye 



Variation. — A second specimen from the same locality shows 

 the following variations. The scale counts are as follows : 

 ventrals, 179; subcaudals, 59; scale rows on neck (at seventh 

 ventral), 29; body, 21; scales between eyes, 13; upper labials, 

 11-10; lower labials, 12; 3 scales behind supranasals bordering 

 rostral. On the right side, the third labial does not touch sub- 

 oculars ; the lateral stripe covers one whole and a half scale rows. 



Remarks. — This species belongs to the Trimeresurus gram- 

 ineus (Shaw) group, which includes T. flavomaculatus and T. ha- 

 lieus of the Philippines. It is differentiated from the other spe- 

 cies, however, by the striking color with no dark markings, the 

 larger number of scales on snout and supraocular region, and the 

 larger unkeeled temporals; the supranasals are larger and more 

 clearly differentiated. Mr. McGregor, its discoverer, and for 



