106 
William Morton Wheeler 
Differing from the worker major in lacking the ocelli, in having 
the mesonotum less sharply marked off from the metanotnm and 
in having the gaster less convex above and more tapering posteriorly. 
The head seems also to be smoother and more shining and the front 
less distinctly and less extensively striated. 
I have redescribed this species in detail because the single worker 
seen by Emery was rather poorly preserved and in an unfavorable 
Position. The single known living species on wich Andre based the 
genns Dimoryhomyrmex , D. janeti, occurs in Borneo and Sumatra. 
According to Andre, its workers are dimorphic, differing in the size 
of the head and body, the latter measuring 6 mm in the soldier and 
3,5 mm in the worker. Emery has given reasons for supposing that 
intermediate forms occur, so that the generic name is not very apt. 
The measurements of D. theryi given above, include also those for 
the forms which may be regarded as mediae. The size of Emery’s 
specimen (between 5 and 5,5 mm) and its lack of ocelli shows that 
it was a minor or minim worker. 
I have examined 36 specimens of D. tlieryi , which are distributed 
as follows: 25 in the Geolog. Inst. Koenigsberg Coli. (B 18900, B 18882, 
B 14186, B 19494, B 14128, XXB 2048, B 19056, B 19722, B 18757 
(two specimens in one block), B 19097, B 18726, B 18992, B 5509, 
B 18416 and ten without numbers); 8 in the Klebs Coli. (K 6397, 
K 4252, K 4442, K 779, «21, «185 and a 245), one in the Berlin 
Museum (313) and two in the Haren Coli. (976 and 1733). K 6397, 
which contains two workers, a major and a minor, side by side in 
the same block, has enabled me to correlate these two phases. In 
this specimen the major is in a very advantageous position and is 
beautifully preserved, but the front of the head of the minor is 
obscured by cracks in the amber. 
Dimorphomyrmex mayri , sp. nov. 
Worker (Fig. 51). Length about 6,5 mm. 
Differing from D. theryi in the following particulars: The head 
is proportionally longer and narrower, with larger and more convex 
eyes; which are nearly half as long as the sides of the head. Ocelli 
lacking. Clypeus longer and more convex, its anterior lobe more pro- 
jecting and rounded, Üie palpi and especially the mandibles decidedly 
longer, the latter being also more slender, with much less convex upper 
surfaces and external borders, and the two basal joints of the antennal 
funiculi are distinctly longer. Mesonotum larger and more convex, 
petiolar node proportionally broader and shorter, being more compressed, 
