56 



William Morton Wheeler 



shorter and somewhat broader than the petiole, convex above and 

 constricted behind. Gaster about as large as the head, with very 

 large first segment into which the remaining segments are withdrawn. 

 Legs long, femora somewhat incrassated; middle and hind tibiae 

 without spurs. 



JElectromyrmex klebsi Wheeler. 



Electromyrmex Klebsi Weehler, Ants, Their Structure, etc. ]910, p. 164, Fig. 94, $. 



Worker (Fig. 21). Length about 5,5 mm. 



Mandibles, clypeus, pronotum, gaster and legs apparently smooth 

 and shining; head with sharp, longitudinal rugae running its entire 



length; mesopleurae and epinotum 

 regularly and transversely, petiole 

 and postpetiole longitudinally rugose. 

 Hairs short, sparse and erect 

 on the body and mandibles, appa- 

 rently absent on the scapes and 

 gaster. 



Color black throughout, more 

 or less of the surface with a sil- 

 very luster. 



Described from a single spe- 

 cimen (K. 2658) in the Klebs Coll. 

 This singular ant is so unlike any of the recent species known 

 to me in the structure of its mandibles, thorax and petiole that it 

 evidently deserves to rank as the t3'-pe of a new genus. The specimen 

 has the tip of the gaster involved in a white cloud and much of the 

 sculpture on one side is obscured by bubbles and air films, but the 

 main characters are sufficiently distinct. The large, anteriorly placed 

 eyes and the slender body and appendages indicate that the insect 

 was an exquisitely arboreal form like the recent species of Sima and 

 Pseudomyrma. 



Genus Agrceconiyrniex, gen. nov. 



Worker. Body short and thickset. Head subrectangular, 

 scarcely longer than broad, slightly broader behind than in front, 

 with rounded sides and posterior angles and small, very convex eyes 

 placed very near the posterior angles, and deep antennal scrobes 

 running from the antennal foveae to the inner border of the eyes. 

 Ocelli absent. Mandibles, short, convex, with 5 subequal teeth. Clypeus 



Fig. 21. 



Electromyrmex klel'si Wheeler. 

 Worker. K 2658. 



