446 bulletin: museum of comparative zoology. 



elevated, not concealing the articulation of the antennae. Eyes well developed, 

 of medium size and strongly convex. Antennae 12-jointed, the last three 

 joints forming a rather narrow club which is much shorter than the remainder 

 of the funiculus. Thorax narrower than the head, arcuate in profile, dorsum 

 without distinct sutures or constrictions, humeral angles bearing triangular 

 teeth, inferior angles of prothorax rounded. Declivity of epinotum with two 

 pairs of spines, the basal pair more elongate than those above. Petiole strongly 

 pedunculate, node well developed, elongate, without ventral tooth. Post- 

 petiole much shorter than petiole and convex above. Gaster a little broader 

 than head, oval, with well-developed sting. Legs rather stout, anterior tibia 

 with pectinate spur, claws simple. Head and body, except the gaster, coarsely 

 sculptured. 



Differs from Podomyrma in the more pronounced dimorphism, the 

 complete absence of thoracic sutures, the strongly armed epinotum, 

 the well-developed petiolar node with its lack of inferior spine, and 

 in the 12-jointed antennae. 



Genotype. — Poecilomyrma senirewae, sp. nov. 



36. Poecilomyrma senirewae, sp. nov. Fig. 16. 



J]'orker major. Length 5 mm. 



Head about as long as broad, as broad in front as behind, with convex sides, 

 broadly posterior corners, and straight border. Mandibles rather thick, their 

 blades with six stout triangular teeth, the anterior two of which are longer 

 than the other and acuminate apically. Clypeus moderately convex at middle, 

 very faintly concave at middle of anterior border. Frontal area large, tri- 

 angular, and very distinct. Frontal carinae little elevated, parallel basally 

 rather than divergent and extending up the front as crenulate carinae. An- 

 tennal scapes extending to occipital corners; first funicular joint longer than 

 the second, but shorter than the second and third together, second joint dis- 

 tinctly longer than broad and longer than the third, joints 3-8 very slightly 

 broader than long; last three joints forming a poorly differentiated club, with 

 the first two about one and one third times as broad as long and together a 

 little longer than the terminal joint. Eyes convex, situated at middle of sides 

 of head. Thorax and epinotum without sutures above, broadest and with 

 convex sides in the pronotal region, which is broader than long and separated 

 from mesonotum by narrow lateral incisions; humeri produced into triangular 

 teeth, which are flat above and a httle broader at base than long; mesoepino- 

 tum broadest in front, gradually narrowing behind, rounding into the flattened 

 declivous portion. Epinotal spines a little shorter than their distance apart 

 at base, straight, thick, blunt apically, extending upward and backward and 

 moderately divergent; basal spines much longer and curved, thick at apical 



