The Ants of the Baltic Amber. 



45 



Tribe Monomoriini, trib. dov. 

 Genus Mononiorhnn Mayr. 



31ono}noriuin pHipes Mayr. (Fig. 14.) 



Monomorium pilipes Mayr, Beitr. Naturk. Preuss. I, 1868, p. 91, Taf. V, Figs. 93, 94, $; 

 Dalla Torre, Catalog. Hymen. VJI, 1893, p. 69; Erx. Andre, Bull. Soc. 

 Zool. France. XX, 1895, p. 82; Handlirsch, Foss. Insekt. 1908, p. 872, 



Twenty two workers of this species, all in the Geolog. Inst. 

 Koenigsberg Coll., have been examined, namely: No. 137/3789 (seen by 

 Mayr and doubtfully referred to this species), XXB 2168, XXB813, 

 XXB 1550, XX 1897, XIII B 3000, B 5338, B 19461, B 304, B 19401, 

 B 251, B 5367, B 18477 and nine without numbers. 



The mandibles have 5 subequal teeth; the mesoepinotal constric- 

 tion is pronounced, the epinotum subangular in profile, with subequal 

 base and declivity, the former feebly 

 convex, the latter sloping and slightly 

 concave. Antenn?e 12-jointed. The pe- 

 tiole has a well-developed, rounded and 

 anteroposteriorly compressed node and 

 a distinct peduncle. The postpetiole is 

 lower and more lounded than the 

 petiolar node. The mesopleurte and 

 epinotum are longitudinally rugulose, 

 the remainder of the body smooth and 

 shining, with scattered piligerous punc- 

 tures, which are most distinct on the pio. j^ 

 head and gaster. Most of the specimens Monomorium pilipes Mayk. Worker, 

 are brown or reddish throughout, a 

 few, which are more decomposed, are black. Length 2 — 2,5 mm. 



Mayr states that this species is most closely related to the living 

 If. destructor Jerdon (= M. hasale F. Smith), an originally paleotro- 

 pical ant now common also in neotropical countries. M. dcatructur, 

 however, has a much more slender thorax, petiole, postpetiole, antenna^ 

 and legs than M. inlipes. 



Monotnoi'itan tncif/rianuni, nom. no v. (Fig. 15.) 



Lampromyrmex gracillimus Mayr, Beitr. Naturk. Preus.s. I, ISdS, p. 9.'). Taf. V, 

 Figs. 97. 98, $; Dalla Torrk, Catalog. Hymen. VII, 1S93, p. 78; 

 Handlirsch, Fos.s. In^^ekt. 1908, p. 873. 



This form unquestionably belongs to the genus Muuunioriiini as 

 at present defined. Mayii was apparently induced by the 11 -jointed 



