Pheidole caltrop ^HNS new species

Types Mus. Comp. Zool. Harvard.

Etymology ML caltrop ^HNS, a four-pointed weapon placed on the ground to impede movement.

Diagnosis A unique member of the fallax ^HNS group characterized as follows.

Major: yellow; occiput, genae, and promesonotal dorsum rugoreticulate; large "sharkfin" protrusion on humerus extends beyond the

boundaries of the rest of the pronotum when viewed from above; dorsum of postpetiolar node carinulate.

Minor: large "sharkfin" angle protrudes from humerus; all of body except gaster foveolate and opaque; very thin nuchal collar

present.

Measurements (mm) Holotype major: HW 1.22, HL 1.18, SL 0.64, EL 0.14, PW 0.62. Paratype minor: HW 0.60, HL 0.66, SL 0.66, EL 0.10, PW 0.42. color Major: concolorous dark yellow. Minor: concolorous medium yellow.

range Known only from the type locality.

biology "From large thorns hollowed out on living tree" (A. E. Emerson, collection note 13 April 1935).

figure Upper: holotype, major. Lower: paratype, minor. PANAMA: Barro Colorado Island (Alfred E. Emerson). Scale bars = 1 mm.