130 
William Morton Wheeler 
permagnum et subcordiforme (in operariä majori)“. The extreme 
measnrement which he gives of this phase (14 mm) is undoubtedly 
excessive. He examined 5 specimens, one in the Geolog. Inst. Koenigs- 
berg Coli. (3719/67), which, though a very small specimen (6 mm), is 
to be regarded as the type, and one speoimen each in the Berendt,. 
Klinsmann, Menge and Mayr Oollections. Besides the type I have 
examined 12 specimens, distributed as follows: 9 in the Geolog. Inst. 
Koenigsberg Coli. (N 18831, B 5435, B 5348, B 5195. B 5520 and 4 
without nnmbers), one in the Berlin Mnsenm (without a nnmber) one 
in the Brussels Museum (232) and one (K 5631) in the Klebs Collection. 
Although these specimens vary considerably in size and are often in 
unfavorable positions or heavily coated with white films, a few of them 
nevertheless show the structure of the head very distinctly and enable me to 
assert that the species is a true Formica , allied to the North American 
F. palliäefulva, which it closely resembles especially in the structure of the 
head, antennse, frontal carinse, maxillary palpi and thorax, although it 
evidently represents an extinct and highly specialized offshoot of the 
probably Mesozoic, ancestral stem which gave rise to the F. pallidifulva 
group of Formicce in the nearctic region. In the structure of the thorax 
and petiole the resemblance to Cataglyphis bicolor Fabr. is even closer. 
It is barely possible that the smallest specimens, to which Mayr’s type 
belongs, may differ specifically from the largest, as the joints of their 
antennal funiculi are proportion ally shorter, but this cannot be decided 
without more and better preserved material. 
Formica sträng nlata, sp. nov. 
Worker (Fig. 62). Length about 7,5 mm. 
Head large, excluding the mandibles about as broad as long T 
broader behind than in front, with feebly convex sides and nearly 
straight posterior border. Eyes rather large. Maxillary palpi long. 
Clypeus sharply carinate, with entire, broadly rounded anterior border. 
Frontal carinse approximated in front and curved, straight and di- 
verging behind. Antennal scapes curved at the base, slightly and 
gradually enlarged at the tip, reaching about 1 / 3 their length beyond 
the posterior border of the head; basal funicular joints fully twice 
as long as broad, distal joints somewhat shorter. Thorax narrower 
than the head, dumb-bell shaped, deeply constricted in the meso- 
epinotal region, so that the dorsoventral diameter just in front of the 
epinotum is less than half that of the pro- or epinotum. Pronotum 
convex and evenly rounded above as is also the epinotum, which 
