462 bulletin: museum of comparative zoology. 



above, as broad as long, with a pair of low longitudinal welts anteriorly 

 and expanded postero-lateral borders, bluntly dentate anteriorly and 

 posteriorly. The scutellum is bluntly bidentate and projecting. 

 The epinotum is abruptly declivous, without distinct base and de- 

 clivity, and with a pair of longitudinal ridges terminating behind in 

 large, blunt, compressed teeth. Between these ridges the surface is 

 transversely rugose. The petiole is small and similar to that of the 

 worker, the postpetiole very large, broader than long, subrectangu- 

 lar when seen from above, with two short, blunt, longitudinal ridges, 

 terminating in large blunt projections behind and separated by a deep 

 concavity. The gaster is broadly oval, hardly longer than broad, 

 rounded above, on the sides and behind, without longitudinal ridges 

 and with a distinct median longitudinal groove at the base. 



'29. Iridomyrmex iniqutis Mayr. ^ . — Cinchona, 5,000 ft. 



30. Iridomyrmex iniquus Mayr var. nigellns Forel. ^ .— Kingston. 



31. Prcnohpis (Nylanderia) longicornis Latr. S 9 .^Newton, 

 3,000 ft. 



32. Prenolepis (Nylanderia) vividula Nyl. ^ . — Cinchona. 5,000 

 ft. 



33. Brackymyrmex hccri Forel var. ohscurior Forel. ^ 9 & .~ 

 Cinchona, 5,000 ft. 



34. Cam.poiwtus (Myrmoturba) conspicuus F. Smith. 



JVorkcr maxima. (Fig. 1, a). Length 8-10 mm. 



Head rather small, trapezoidal, with broadly excised posterior 

 border and the sides straight in the middle and rounded anteriorly. 

 Cheeks with an oblique impression. Eyes moderately large, vertex 

 with three ocellus-like pits. Mandibles small, very convex, 7-toothed. 

 Clypeus sharply carinate, its lobe very short and indistinct, hardly 

 notched in the middle. Frontal area small, rounded anteriorly and 

 posteriorly. Antennal scapes slightly flattened but not dilated at the 

 base, gradually enlarged distally and extending about \ their length 

 beyond the occipital border of the head. Thorax narrow and low, 

 laterally compressed behind, its dorsal outline in profile rather evenly 

 convex, but with the base of the epinotum feebly concave. The base 

 is twice as long as the declivity into which it passes through a distinct 

 obtuse angle. Mesonotum present but bounded by feeble sutures; 

 promesonotal suture strongly impressed. Petiole small, oval, as high 

 as the epinotal angle, convex in front, flat behind, with entire, rounded, 

 moderately sharp border. Gaster elongate elliptical. Legs slender, 



