82 
Psyche 
[June-September 
all as in solifontis , and even the pilosity of the two species 
is closely similar. The compound eyes of dyak are nearly 
twice the size of those of solifontis , and are more strongly 
convex and protruding laterally. Clypeus depressed and 
excised anteromedially. 
Petiolar node as in solifontis, longer than broad and slight- 
ly longer than its peduncle; spongiform appendages well 
deve^ped, but the lateral lobes not reaching the anterior 
nodal slope. Postpetiolar node smaller than that of soli- 
fontis, bare\y broader than long and only slightly broader 
than the petiole, its disc convex, smooth and shining, with 
a few short, weak longitudinal costulae along the anterior 
border. Unlike those of solifontis, the definitely smooth, 
shining areas on the sides of the alitrunk in dyak are re- 
stricted chiefly to the lower mesopleura. Basal gastric cos- 
tulae somewhat spongiform, extending about 1/5 the length 
of the basal tergite. 
Ground pilosity of head rather sparse, consisting of sub- 
reclinate to obliquely erect, short, fine truncate hairs, be- 
coming feeb'y spatulate on the free clypeal margin. Scape 
hairs fine, directed apicad. Ground hairs of alitrunk rare, 
fino and inconspicuous, appressed to reclinate. About 6 
longer, erect, fine truncate hairs bordering each occipital 
lobe laterally, posteriorly and medially ; 3 pairs of the same 
on the alitrunk, the humeral pair being long and subflagel- 
late mesonotal pair long, pair on mid-pronotum not so long, 
incfined anteriorly. Sparse growth of long, fine erect hairs 
on petiole, postpetiole and gaster. Propodeal teeth acute 
and elevated, their infradental lamellae moderate in size, but 
expanded below and with a small growth of spongiform 
tissue laterally. Color ferruginous yellow (possibly faded) ; 
dorsum of head, except occipital lobes, faintly more pig- 
mented. Mandibles and appendages light yellow, with red- 
brown teeth on the former. 
Holotype a single worker from “head Camp, N. Borneo” 
(leg. E. Mjoberg, British North Borneo collecting tour), 
deposited in MCZ. 
Paratype a single worker in mcz, “foot of Mt. Murud,” 
North Borneo (Mjoberg leg.). Size slightly smaller than in 
holotype, but proportions of head and mandibles identical. 
