130 William Morton Wheeler 



permagnum et subcordiforme (in operaria majori)". The extreme 

 measurement which he gives of this phase (14 mm) is undoubtedly- 

 excessive. He examined 5 specimens, one in the Geolog. Inst. Koenigs- 

 berg Coll. (3719/67), which, though a very small specimen (6 mm), is 

 to be regarded as the type, and one specimen each in the Berendt, 

 Klinsmann, Menge and Mayr Collections. Besides the type I have 

 examined 12 specimens, distributed as follows: 9 in the Geolog. Inst. 

 Koenigsberg Coll. (N 18 831, B 5435, B 5348, B 5195. B 5520 and 4 

 without numbers), one in the Berlin Museum (without a number) 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.pallidefulva, which it closely resembles especially in the structure of the 

 head, antennae, frontal carinas, 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 FormiccB 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 proportionally shorter, but this cannot be decided 

 without more and better preserved material. 



Formica strangnlata, sp. nov. 



Worker (Fig. 62). Length about 7,5 mm. 



Head large, excluding the mandibles about as broad as long,, 

 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 Y3 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, whioli 



