The Ants of the Baltic Ambor. 95 



Hairs delicate, sparse, erect, present only on the mandibles, 

 clypeus and posterior portion of the gaster. 



Color black. 



Described from a single specimen (B 5385) in the Geolog. Inst. 

 Koenigsberg Coll. It is in a beautiful state of preservation in clear 

 amber, and with the exception of the anterior portion of the head, 

 in a very favorable position for study. 



This ant does not seem to be a typical Iridomyrmex, but I know 

 of no other genus to which it can be assigned, and it does not seem 

 advisable to erect a new one for its accomodation, since none of the 

 characters in which it departs from the other species of Iridomyrmex 

 is very prominent. From all of the previously enumerated amber 

 species it is distinguished by its subrectangular head and the peculiar 

 shape of its thorax and petiole. 



Genus Lionietopum Mayk. 

 Lionietopmn oligocenicunif sp. nov. 



Worker (Fig. 46). Length 5,2 mm. 



Head, excluding the mandibles, a little longer than broad, broader 

 behind than in front, with rounded posterior corners, concave posterior 

 and feebly convex, lateral borders. Eyes in front of the middle of 

 the head. Ocelli small, but distinct. Mandibles with convex lateral 

 borders, somewhat flattened upper surface and 8 — 9 -toothed apical 

 borders. Clypeus flattened, with the anterior border straight in the 

 middle, projecting and slightly swollen on each side. Maxillary palpi 

 long, 6-jointed, labial palpi 4-jointed. Antennae rather stout, the tips 

 of the scapes reaching nearly to the posterior corners of the head; 

 joints 2 — 9 of the funiculi as broad as long, first joint fully twice as 

 long as broad, second joint somewhat shorter. Thorax rather long, 

 with longer and more angular epinotum and more distinct epinotal 

 suture than in the recent species of the genus. Petiole as in the recent 

 L. apiculatum Mayr, with the node inclined forward and pointed above. 

 Gaster moderately large, elliptical and somewhat flattened dorsoven- 

 trally. Legs stout. 



Mandibles very coarsely punctate. Body and appendages opaque, 

 without distinct sculpture, but apparently very finely punctate or 

 shagreen ed. 



Erect hairs sparse, visible on the head, thorax and gaster. Pubes- 

 cence very short, but dense, visible on the legs, antennii' and many 

 portions of the trunk. 



