314 WHEELER. 



•cular articulations fuscous. In some specimens the last gastric 

 ■segment is infuscated and the mesonotum has a fuscous streak on each 

 parapsidal furrow and a broader, paler brown, anteromedian streak. 

 The pilosity, especially on the thorax, is shorter than in the typical 

 jnlosum. Wings less yellowish, slightly infuscated, with brown, 

 instead of resin yellow veins. 



I regard as typical pilosum males several specimens in my collec- 

 tion from Frontera, Tabasco, Mexico; Nogales, Arizona (Oslar), 

 Texas (Belfrage), Wharton, Texas (Cornell Univ.) and Austin, Texas 

 (Wheeler). Forel's var. aztccwn is extremely close to some of these. 

 His subsp. roscnhergi is scarcely smaller (13 mm.), the head behind 

 the eyes is described as feebly convex, instead of concave, the mesono- 

 tum as not so far advanced anteriorly over the pronotum, the tibiae 

 as less enlarged apically, the color as darker and the wings as tinged 

 with blackish brown. I am inclined to believe that this is not a form 

 •of piloswn, but a distinct species, as Forel himself surmised. 



Eciton (Acamatus) carolinense Emery. 



Female (Fig. 8a and h). Length nearly 14 mm.; gaster 8.6 mm. 



Head from the front as long as broad, scarcely broader anteriorly 

 than behind, its sides rather rounded, its posterior border slightly 

 emarginate, with a median longitudinal groove, deep and very distinct 

 on the anterior half of the head, very faint on the posterior half. At 

 the sudden transition between the two halves of the groove the surface 

 is distinctly impressed. Seen from behind the head is subpentagonal, 

 narrowed above, with concave occipital border and bluntly angular 

 inferior occipital corners. Ocelli lacking; eyes reduced to minute 

 white dots, just in front of the posterior third of the head. Mandibles 

 narrow, edentate, straight, their pointed tips not incurved. Clypeus 

 broad, somewhat impressed in the middle, the anterior border nearly 

 straight, very feebly arcuate. Frontal carinre short, welt-like, not 

 encircling the antennal foveae in front. Antennal scapes robust, 

 about half as long as the head, excluding the clypeus; funiculi nearly 

 three times as long as the scapes and more slender; first joint small, 

 as broad as long; joints 2-8 a little longer than broad; remaining 

 joints longer; last joint nearly as long as the two preceding taken 

 together. Thorax long, narrow through the pronotum, broader 

 through the mesonotum and broadest through the epinotum, which 

 •does not, however, equal the width of the head. In profile the thorax 



