356 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 92 
KEY TO MEMBERS OF THE FORMOSUS GROUP 
1) Utymieally. one canta oe ee 2 
Typically two canthal se ee ee a ee eee 4 
2. Supraoculars very large, in a single row, frequently one or more in contact 
with median head scales; dorsals 31 to 38; a lowland species ; Motagua River 
valley and arid basin at Salama, Guatemala___________---------_- lunaei 
Supraoculars smaller, in 2 rows, rarely any in contact with median head 
scales) dorsals. 30) to: Ls highlanduraces! =. 222— 4 22 ieee eee 3 
3. Dorsals 30 to 39; El Salvador and central Honduras to Panama 
malachiticus malachiticus 
Dorsals 39 to 51; central plateau of Guatemala and its extensions 
m. smaragdinus 
4, Median separated from lateral frontonasals_________-_-___-__________---- 5 
Median in contact with lateral frontonasals_.__-___________--_______2__- == C 
5. Dorsals about 31; internasals large, keeled, 3 from rostral to median fronto- 
nasal; known only from Conjab, between San Bartolomé and Comitan, 
Chiapas see til ret te thy eee ie as es ee Dee ota Pie Sealey prezygus 
Dorsals 37 to 45; internasals smaller, not keeled, rugose or not_------------ 6 
6. A complete nuchal collar, sometimes narrowly interrupted medially; central 
Veracruz to Isthmus of Tehuantepec___-_-_---_--_-_- malachiticus salvinii 
Nuchal collar incomplete; highlands of Chiapas and northern Guatemala in 
@oban’ arenes. es2 ive ewe ee ee ee eee m. taeniocnemis 
co | 
. Anterior section of frontal usually longitudinally divided; canthals sharply 
ridged; no nuchal collar; ventrals a fourth, laterals not more than two- 
thirds, size of dorsals; mountainous regions of western Mexico from Nayarit 
COMGICRRChO See Sa Oe ee ee ee ee asper 
Anterior section of frontal rarely longitudinally divided; canthals rounded; 
a nuchal collar or not; ventrals a half, laterals three-fourths size of 
GOrsalsh es fe SRO Set FN ee a a ee ee ee eee 8 
8 A: broad, nearly or quite complete, nuchal collar____________-__~--.---_=- g) 
Collar, if present, restricted to sides\of necks=-__=22=- 2-2 ee 10 
9. Femoral pores 12 to 16; one or more of supraoculars generally in contact with 
median head scales; Pacific coast foothills, Chiapas to El Salvador 
malachiticus acanthinus 
Femoral pores 16 to 21; supraoculars not in contact with median head scales ; 
eentral: Guerrero, (‘Rierra .Colorada) 22-2222. 223 =a stejnegeri 
10. Males without yellow on throat, dorsal scale rows black-edged, dorsal head 
seales with a light blue center; central Guerrero_____~- formosus scitulus 
Males with yellow or orange on throat, dorsal surface uniform blue, head 
seales not light-spotted; central Veracruz south in mountainous regions to 
the: Isthmusiof Tehuantepecs £22 = a ee ee ee f. formosus 
SCELOPORUS MUCRONATUS AUREOLUS, new subspecies 
Holotype—U.S.N.M. No. 112232, male, 2 miles west of Acultzingo, 
Veracruz. 
Paratypes—Twenty-six topotypes (Nos. 112233-112258) in the 
United States National Museum; 36 topotypes (Nos. 3073-8080, 3082- 
3102, 3171-8174, 3193-8195) in the EHT-HMS collection; 16 speci- 
mens (No. 1516) from Atzitzintla, Puebla, in the Field Museum of 
Natural History; and 6 specimens (Nos. 18815-18820) from the vicin- 
