328 bulletin: museum of comparative zoology. 



longer than broad, decidedly broader behind than in front, with 

 straight sides, rounded posterior corners, and narrow, excised, and 

 marginate occipital border. In profile the head is very convex in the 

 region of the vertex above and posterior portion of the gula below, 

 flattened in front and on the sides to the sharp edge of the frontal 

 carinae and their backward continuations. Clypeus rather concave, 

 about as long as broad, with semicircular, entire anterior border. 

 Eyes convex, at about the middle of the head, but near the ventral 

 surface and not visible when the head is seen from above. Antennae 

 robust, scapes terete but distinctly swollen, first funicular joint as long 

 as the second and third together. These are subequal and scarcely 

 longer than broad. Third joint longer than broad and nearly ^ as long 

 as the terminal joint. Thorax slender, through the pronotum about 

 half as broad as the head, broadest through the humeri which are very 

 projecting and distinctly angular or conical. Pro- and mesonotum in 

 profile gently convex, not separated by a suture, the mesonotum 

 laterally marginate and with a median longitudinal ridge, the meso- 

 pleurae high and rather concave. The lateral marginations of the 

 mesonotum are continued back over the base of the epinotum into the 

 spines, which are well developed, straight, and acute, nearly as long 

 as the base of the epinotum and directed backward, upward, and out- 

 ward. Their bases are laterally compressed and translucent below. 

 Epinotal declivity concave, somewhat shorter than the base, its 

 inferior angles compressed but not acute. Petiole with a long pe- 

 duncle, as long as the node, which rises abruptly in front and has a 

 gently convex, backwardly sloping dorsal surface; seen from above 

 the node is as long as broad and evenly rounded and submarginate on 

 the front and sides. Attached to the ventral border of the peduncle 

 and node is a long, compressed, band-shaped, transparent, spongiform 

 appendage. Postpetiole from above, transversely elliptical, nearly 

 twice as broad as the petiolar node and twice as broad as long, in profile 

 a little longer than high, evenly convex above, with a large and promi- 

 nent ventral and two smaller, lateral spongiform appendages. Gaster 

 a little larger than the head, elliptical, with nearly straight anterior 

 and rather sharply marginate lateral borders, its ventral as convex as 

 its dorsal surface and nearly the entire surface formed by the first seg- 

 ment. Its anteroventral surface is furnished with a flat, squamiform 

 and pointed spongiform appendage. Legs rather long and stout. 



Mandibles shining, evenly and sparsely punctate. Head sub- 

 opaque; clypeus and upper surface of head reticulate-rugose and 

 coarsely punctate; antennal scrobes and gula densely and evenly 

 punctate; region of the frontal area smooth and shining. Thorax 



