304 



bulletin: museum of comparative zoology. 



Mandibles densely and finely striolate and with elongate punctures. Front 

 of head between frontal carinae longitudinally striate; remainder of front 

 except between eyes and antennae, strongly and concentrically striate; lateral 

 fossae at the anterior border with short striae, but most of the surface smooth 

 and shining; vertex and sides densely striate, the striae becoming more subtle 

 posteriorly and lacking for a short distance from the sides of the medial impres- 

 sion; occiput sparsely punctate and shining. Prothorax transversely and 

 somewhat arcuately striate; meso- and epinotum transversely striate. Base 

 of petiolar node striate. Gaster finely punctate and shining. 



Female. Length 19 mm. 



Mesonotum and scutellum with strong longitudinal striae. 



Anterior portion of prothorax, a discal spot, disc of mesothorax and anterior 

 face of scutellum fuscous. The rest as in worker, with the usual sexual 

 differences. 



Wing (length 12 mm.) faintly infuscated; veins and stigma brown. 



Male. Length 12 mm. 



Head, excluding eyes, longer than broad, broadly rounded behind. Mandi- 

 bles rudimentary. Cl3rpeus convex, the anterior border almost straight. 



Antennal scape thick, three times 

 as long as the first funicular joint; 

 funicular joints, except the first, 

 very long and slender; the second 

 three times as long as the scape; 

 remaining joints gradually shorter; 

 with the terminal joint less than 

 twice as long as the penultimate. 

 Eyes emarginate on inner border. 

 Ocelli large and prominent. Me- 

 sonotum little convex above. Scu- 

 tellum a little broader than long, 

 somewhat pyramidal in shape, 

 with a short, longitudinal impres- 

 sion at apex. Epinotum slightly 

 convex basally, with a well-marked 

 declivous portion. Petiole two 

 and a half times as long as broad; 

 in profile twice as long as high; anterior face concave, narrowly margined at 

 sides; upper surface elevated into a flat projection that is strongly and sharply 

 margined on its posterior face; spiracles on sides situated at tips of strong, 

 elongate tubercles. Gaster long and slender. 



Subopaque. Head, pro- and mesothorax, and scutellum delicately striolate 

 and punctate. Epinotum more strongly, obliquely longitudinally striate. 



Fig. 12. — Odontomachus imperator emery i 

 Mann. Males. Lateral views showing varia- 

 tions in petiole. 



