392 Bulletin American Museum of Natural History. [Vol, XXI, 



outer pair triangular, neariy three times as long as broad at the base, tapering 

 to a rounded tip; the bifurcated median pair are slender, digitiform, with 

 the papillose surfaces at the tip; the inner pair are simple and triangular, 



with tapering 

 rounded tips. 

 Legs long and 

 slender. 



Shining ; the 

 head and thorax 

 a little more 

 opaque than the 

 g a s t e r as their 

 surfaces are 

 somewhat sha- 

 greened. Ap- 

 pendages sub- 

 opaque. 



Pile and 

 pubescence simi- 

 lar to those of the worker. Hairs on the outer genital appendages rather 

 feeble. 



Dark brown, gaster nearly black. Mouth parts, articulations of legs, wing- 

 insertions, antennal funiculi, and genital appendages yellow or pale brown. 

 Wings uniformly grayish hyaline, with very pale veins. 



Fig. 3. — A outer, B median, and C inner genital valve of male Prenolepis 

 arenivaga sp. nov. 



Described from several specimens taken in the pine barrens at 

 Lakehurst, Sept. 25, 1904. This species occurs also in the sandy 

 post-oak woods at Delvalle and Montopolis near Austin, Texas. In 

 all these localities it lives in the pure sand and makes the same kind 

 of nests, namely, flat craters about i^ to 2 inches in diameter with a 

 small central entrance. At Lakehurst the ants live in the pure white 

 sand overlying 

 a layer of ochre 

 yellow sand. As 

 they dig down 

 into the latter 

 the craters con- 

 trast in color 

 with the sur- 

 rounding white 

 surface. 



Although the 

 workerofP. 



avenivaga resembles that of P. guatemalensis in its pale yellow color, 

 the former species is nevertheless clearly distinct as shown' by the 



Fig. 4. — A outer, B median, and C inner genital valve of male Prenolepis 

 guatemalensis Forel. 



