1907.] Wheeler, F ungus-groinng Ants of North Avicrica. 701 



body and appendages. Pubescence abundant on the body and rather long, of the 

 same color as the hairs; absent on the appendages, with the exception of the antennal 

 funicuh. 



Ferruginous brown; borders of mandibles black. 



Media. (Fig. 7 and PI. XLIX, Fig. 13). Length: 3-9 mm. 



Resembling the soldier but with proportionally smaller head and all the cephalic 

 and thoracic spines longer and more acute, especially the posterior occipital and the 

 superior pronotal pairs. The latter are often much longer than the epinotal spines 

 and curved forward at their tips. 



Minima. (Fig. 7 and PI. XLIX, Fig. 14.) Length; 1.5-2.5 mm. 



Head proportionally smaller than in the soldier and media; mandibular teeth 

 more acute; lobes of frontal carirue, lateral carinse and ventro-lateral surfaces of 

 head without teeth. Anterior and posterior occipital spines much reduced. On the 

 thorax the superior are not longer than the inferior pronotal spines and much shorter 

 than those on the epinotimi. Pubescence and hairs much sparser and more incon- 

 spicuous than in the soldier and media. 



Female. (Fig. 7.) Length: 17-18 mm. 



Head without the mandibles, much broader than long, arcuately excised behind, 

 with rather straight, anteriorly converging sides. Mandibles and clypeus similar 

 to those of the soldier, but the former ^\'ith at least 12 basal teeth, the latter with the 

 two teeth of its anterior border blunter and more prominent. Frontal and lateral 

 carinse with prominent teeth. Spines of anterior occipital and ventro-lateral surface 

 of head reduced to low projections. Posterior occipital spines small but acute. 

 Thorax robust, distinctly longer than the first gastric segment; twice as broad as 

 the head. Inferior pronotal spines small and acute; superior pair lacking. Scutel- 

 lum rounded, convex, ^N-ithout a median longitudinal impression. Epinotum with 

 a pair of small, acute, backwardly directed spines, each of which has a prominent, 

 elongate swelling in front of its base. Petiole more than twice as broad as long; 

 broadest in the middle and produced on each side into a long, slender spine or proc- 

 ess. Postpetiole less than twice as broad as the petiole and fully twice as broad 

 as long, widest behind with two pairs of truncated lateral projections, of which the 

 posterior is the longer. Lower surface with a pronainent transverse ridge. Gaster 

 nearly as broad as long, but little broader in the middle than at its straight anterior 

 border. Anterior corners of first segment rectangular. Legs slender and weak. 



Mandibles, anterior border of clypeus, scapes and legs shining; clypeus and 

 mandibles punctate, the latter also ver\' coarsely striated. Remainder of body 

 opaque, granular-rugulose. Mesopleurte coarsely rugose. 



Hairs and pubescence tawny, the fomier dense and erect on the body and ap- 

 pendages, the latter sparse, somewhat reclinate and hooked, most conspicuous on 

 the head and gaster. 



Deep maroon brown, legs more reddish; borders of mandibles black. Wings 

 with ferruginous brown veins and a strong suffusion of the same color in the mem- 

 branes, especially along their anterior borders. ',: 



Male. (Fig, 7, and PI. XLIX, Fig. 24.) Length: 13-14 mm. 

 Head small, without the mandibles but little broader than long, flattened behind 

 but not excised, with large and very prominent eyes and ocelli. Mandibles well- 



