358 bulletin: museum of compaeative zoology. 



13. Opithopsis diadematus var. dubius, var. nov. 



Worker. Length 4.5 mm. 



Differing from the typical diadematus in having the head more 

 flattened as in rufithorax and in having the second gastric segment 

 entirely orange-yellow above. 



A single specimen taken by Mr. A. M. Lea at Longreach, Queens- 

 land. Perhaps this form should be regarded as a variety of rufithorax, 

 and perhaps diadematus should be regarded as a subspecies of that 

 form. The head of the new variety is certainly intermediate in shape 

 between the two, though its coloration is that of diadematus. 



14. Opisthopsis major Forel. 



Plate 1, fig. 7, 8. 



Opisthopsis major Forel, Rev. Suisse zool., 1902, 10, p. 492, ^ ; Frog- 

 gatt, Agric. gaz. N. S. W., 1905, p. 28, ^ ; Forel, Rev. Suisse 

 zool., 1910, 18, p. 70, y . 



Worker. Length 4.5-7 mm. 



Averaging larger than most of the preceding species. Head rather 

 broad, evenly convex above and below, with convex sides, straight 

 posterior border and rather small eyes. External borders of the 5- 

 toothed mandibles convex. Clypeus broader than long, indistinctly 

 carinate. Funicular joints a little shorter than in the preceding spe- 

 cies. Thorax with the epinotum decidedly lower, so that the outline 

 of the mesonotum and base of the epinotum, though forming a straight 

 Hne, slopes backwards; base and declivity of epinotum subequal, 

 forming a rounded and very obtuse angle. Petiole of the usual shape, 

 its scale as high as the epinotal angle. Gaster and legs of the usual 

 shape. 



Shining, very finely and indistinctly shagreened and very finely 

 and sparsely punctate. Mandibles coarsely shagreened and punctate. 



Hairs yellow, erect, sparse on the head and gaster, absent on the 

 thorax and petiole, except on the pronotum where they form a con- 

 spicuous tuft arranged in a semicircle. Pubescence almost absent, 

 very short and dilute on the sides of the head. 



Orange-yellow; mandibular teeth brown; antennal funiculi, except 

 their basal joint, gaster behind the second segment, posterior half or 

 two thirds of the second segment and a narrow transverse band near 



