LEVITON, BROWN, & SILER: PHILIPPINE VENOMOUS SNAKES 
517 
Description. — Scales on head and chin smooth or irregularly keeled; second upper labial 
fused to scale forming forming anterior border of facial pit; body scales in 21 longitudinal rows 
around midbody, 29 rows around neek; a distinet light stripe, or at least a series of light spots, pres¬ 
ent along outer scale row; dorsal color highly variable, with dark pigments present, usally blue 
green, green, or dark blue gray, sometimes as scattered, irregular spots or blothches, also as distinet 
erossbars; tail not distinctly differentiated from body by color; hemipenes without spines; ventrals 
(cJ) 170-178, (?) 177-182, subeaudals (cJ) 62-71, (?) 58-63. 
Size.— Snout-vent length (c?) 614 mm, (?) 929 mm; tail length ((?) 151 mm, (?) 163 mm. 
Distribution. — Endemic to Philippines (Camiguin; Jolo; Leyte; Luzon [Prov.: Aurora, 
Bataan, Bulacan, Cagayan, Camarines Norte, Iloeos Norte, Isabela, Kalinga, Laguna, Quezon]; 
Mindanao [Prov.: Davao, Lanao]; Mindoro). 
Remarks. — Gumpreeht et al. (2004:32) chose not to recognize T. flavomaculatus halieus as 
a subspecies and elevated T. f mcgregori to the rank of full speeies, as do David et al. (2011:43). 
With respect to T. f. halieus, we are inclined to agree with their handling of that taxon. Indeed, 
recent field observations by several of the authors indicate that there is a wide range of color and 
pattern polymorphism both within and among populations throughout the range of the species. We 
also agree with the elevation of T. mcgregori to the rank of full speeies. Furthermore, reeent exam¬ 
ination of material from Mindanao suggests that the population inhabiting that island is quite dis¬ 
tinet from Luzon T. flavomaculatus and should possibly be accorded recognition as a full species 
for whieh the name T. schadenbergi Fiseher, 1885, is available. Aceording to Gemot Vogel and 
Patriek David (2007:37), this matter is under investigation and the results are seheduled to appear 
in due eourse; thus we refrain from making any changes at this time. 
Trimeresurus {Parias) mcgregori (Taylor, 1919) 
McGregor’s Pitviper 
Figures 14, 51 
Trimeresurus mcgregori Taylor, 1919:110.— Taylor, 
1922a:284.— Gumpreeht et al., 2004: 35, 18 col. 
photos (pp. 246-250). 
Trimeresurus flavomaculatus mcgregori, Leviton, 
1964:261.— Toriba, 1993:98.— David and Ineich, 
1999:284. 
Description. — Scales on head and ehin 
smooth or irregularly keeled; seeond upper labial 
fused to scale forming forming anterior border of 
facial pit; a distinct light stripe, or at least a series 
of light spots, present along outer scale row; dorsal 
color yellow to greenish yellow with darker pig¬ 
ments forming irregular spotted patches along mid¬ 
dorsum; tail not distinetly differentiated from body 
by color; hemipenes without spines. 
Size.— Snout-vent length (?) 587 mm; tail 
length (?) 97 mm. 
Distribution. — Endemie to Philippines 
(Batan, Sabtang, and Cagayan Ids.). 
Remarks. — See remarks above under 
T. flavomaculatus. 
Figure 51. Trimeresurus {Parias) mcgregori, color 
and pattern variants. Photo by Rafe Brown. 
