1955] 
Gregg — A Neiv Pheidole 
23 
\0R WORKERS) 
Pheidole p. coloradensis 
N Strong longitudinal rugae 
I fading out toward occiput; 
I entire head finely granu- 
I late; vertex and occiput 
It with coarse piligerous fo- 
I veolae ; opaque 
I Thorax granulate; faint ir- 
I regular rugae; opaque; gas- 
I ter shagreened but slightly 
I shining 
I Length, 4.67 mm. 
Head index, 0.94 
I (average 10 individuals) 
| Prominent 
Conules prominent and 
sharp 
Very shallow 
Body dark reddish brown , 
head and gaster somewhat 
lighter 
Pheidole p. pacifica* 
Feeble transverse occipital 
striae, confined to the top 
of the occiput; vertex 
strongly shining 
Dorsum of the pronotum 
smooth and shining, pleurae 
finely rugulose; epinotum, 
petiole and postpetiole 
punctate 
Length, 4.50 mm. 
Head index, 0.93 
(2 individuals) 
Prominent 
Conules present but blunt 
Shallow and concave 
Head yellowish red with a 
brown spot on vertex; tho- 
rax and gaster brown 
Pheidole senex 
Longitudinal rugae on 
frons ; transverse rugae on 
occiput converging to fur- 
row ; interrugae granulate, 
subopaque ; vertex smooth 
and shining 
Thorax opaque ; pleural 
rugae longitudinal, dorsal 
rugae transverse to irregu- 
lar; petiole, postpetiole, gas- 
ter granulate 
Length, 5.41 mm. 
Head index, 0.91 
(average 10 individuals) 
Very prominent 
Conules decidedly promin- 
ent, sharp 
Shallow and concave 
Head brownish red ; tho- 
rax dark brown ; gaster 
light brown 
vERS 
Entire head, thorax, and 
petiole granulate; head also 
with fine, longitudinal ru- 
gulae, opaque; postpetiole 
smooth dorsally; gaster 
shagreened 
Postpetiole narrow. IV 2 
times as wide as petiole 
Head finely, longitudinally 
rugulose and punctate; sub- 
opaque 
Very similar to coloraden- 
sis except postpetiole granu- 
late dorsally 
