wheeler: ants of the genus opisthopsis. 359 



the posterior margin of the first segment, black or dark brown. Eyes 

 pearl-gray or black. 



Female. Length 8-8.5 mm. 



Head like that of the worker, but a little shorter. Mandibles 5- 

 toothed. Thorax elongate elHptical, through the wing-insertions not 

 broader than the head through the eyes. Mesonotum distinctly 

 broader than long. Epinotum with distinct base and declivity, the 

 former short and convex, the latter long, abruptly sloping and con- 

 cave in profile. Petiolar scale with very feebly emarginate superior 

 border. Gaster elliptical, as long as the thorax. Wings rather 

 short (7 mm.), with a well-developed, triangular discal cell. 



Sculpture and pilosity as in the worker, but mesonotum and scutel- 

 lum smoother and more shining, pronotum without hairs and meso- 

 notum sparsely hairy. 



Color like that of the worker but with the scutellum and middle of 

 the metanotal sclerite black. Wings distinctly tinged with yellow, 

 especially towards the base, with resin-yellow veins and pterostigma. 

 Eyes black. 



Queensland: Mackay, type-locality (Turner); Cape York; 

 Townsville (F. P. Dodd); Rockhampton (A. M. Lea). 



I have examined two cotype workers received from Professor Forel, 

 four workers and a female taken by Mr. Dodd and a worker taken by 

 Mr. Lea. 



This species is very distinct in its average large size, in the structure 

 of the epinotum of the worker, the conspicuous tuft of hairs on the 

 pronotum and the color of the gaster. In Fig. 7 the epinotal angle is 

 too sharp and the base and declivity should be more nearly equal. 

 The head, represented in Fig. 8, is a little too broad. 



L5. Opisthopsis jocosus, sp. nov. 



Plate 3, fig. 22-24. 



Worker. Length 4-6.5 mm. 



Head of the largest workers large and very broad through the middle, 

 with very convex sides and feebly concave posterior border, narrowed 

 at the anterior border; in profile evenly convex above and below; in 

 the smallest workers the head is narrow, with straight sides and more 

 concave posterior border and its dorsal and ventral surfaces are less 

 convex. Eyes far apart, relatively larger in the small workers. 

 Mandibles with feebly concave external borders, 5-toothed. Clypeus 



