1907.] Wheeler, Fungus-growing Atits of North America. 711 



the thorax, excepting the inferior pronotal pair, covered with tubercles. Petiole 

 from above oblong, slightly longer than broad, with bidentate anterior angles, and 

 a pair of longitudinal dorsal ridges elevated into short spines or teeth at their anterior 

 ends. Postpetiole more than twice as broad as the petiole, somewhat broader than 

 long, transversely elliptical, with the sides produced in the middle in the form of 

 short double spines; posterior margin semicircularly excised and somewhat reflected; 

 upper surface with a pair of irregular elevations and numerous small tubercles. 

 Gaster subspherical, but little longer than broad, anterior border straight, first seg- 

 ment obtusely ridged on the sides anteriorly, without a median depression and uni- 

 formly covered with small tul^ercles which are somewhat larger on the dorsal than 

 on the ventral side. Legs well-developed and, like the antenna! scapes, covered 

 with small tubercles. 



Mandibles somewhat shining, finely striated at their bases, more coarsely towards 

 the inner edges of the blades. Remainder of body opaque, granulate-rugulose; 

 rugulae on the sides of the head and between the lateral and frontal carinte longitudi- 

 nal and minutely and irregularly tuberculate, on the front con^'erging from each 

 side towards the median line. On the thorax the rugulce are irregularly longitudinal, 

 more regularly on the mesonotum and scutellum where they are interrupted by low 

 tubercles. Postpetiole and first gastric segment, especially at its base, obscurely 

 and longitudinally rugulose. 



Hairs dark brown, short, hooked or curved, suberect, uniformly covering the 

 body and appendages. Antennal funiculi with very fine whitish pubescence. 



Ferruginous brown, front and vertex darker, mandibular teeth black. Whole 

 surface of body bluish pruinose. 



Male. Length: 4.5 mm. 



Head, without the eyes, somewhat longer than broad, a little broader behind 

 than in front, with straight posterior border. Posterior orbits at the middle of the 

 head. Mandibles well-developed, with two larger, acute apical and several small 

 basal teeth. Clypeus with entire, broadly rounded anterior border. Frontal 

 carinse with well-developed anterior lobes and short posterior ridges which bend 

 around laterally and pass over into the lateral carinse, thus enclosing two elliptical 

 facial cavities. Antennae slender, scapes slightly thickened distally and reaching 

 more than ^ their length beyond the posterior corners of the head. Posterior corners 

 with short, acute spines, those on the superior and inferior angles being somewhat 

 larger than the others. Inferior and superior pronotal spines very small and acute. 

 Mayrian furrows of mesonotum distinct but shallow. Scutellum like that of the 

 female. Epinotum with base somewhat shorter than the oblique declivity; spines 

 rather short, somewhat longer than Inroad at the base, as long as the base of the epino- 

 tum, acute, directed l:)ackward and slightly outward, covered with small tul^ercles. 

 Petiole similar to that of the female but concave in the middle and traversed by four 

 longitudinal tuberculate ridges. Postpetiole less than twice as broad as the petiole, 

 and nearly twice as broad as long, subpentagonal. with broadly excised posterior 

 border and covered with tubercles. Gaster elliptical, convex above, covered uni- 

 formly with small acute tubercles except in the middle line near the base. Outer 

 genital valves short and broad, with rounded tips; median pair terminating in a 

 straight, attenuate point. Hypopygium entire, very bhmtly jiointetl in tlic middle. 

 Legs long and slender, covered with very small and rather indistinct tulicrclcs. Last 

 tarsal joints enlarged. 



