The Ants of the Baltic Amber. 



43 



joints together. The head and pronotum are rather densely, the epi- 

 notum very densely punctate. All of these characters are well shown 

 in the two specimens, ex- 

 cppt the mandibles, which 

 are tightly closed and in an 

 unfavorable position. Both 

 specimens are black, with 

 the surface more or less ob- 

 scured by a silvery air-film, 

 and both show long, sparse, 

 suberect hairs on the gaster. 

 One of the specimens has 

 the long sting exserted. 

 Two additional specimens in 

 the Geolog. Inst. Koenigs- 

 berg Coll. (No. 638/10245 

 and one without a number) each measure about 5,5 mm. and are in 

 an excellent state of preservation. 



Fig. 11. Sima simplex '^Ia.yr. a) Worker; b) antenna. 



Sinia angustata Mayr. (Fig. 12.) 



Sima avgustata Mayr, Beitr. Naturk. Preuss. I, 1868, p. 102, PI. V, Fig. 106, $; 

 Dalla Torre, Catalog. Hymen. VII, 1893, p. 53;. Haxdlirsch, Foss. 

 Insekt. 1908, p. 872. 



This is a smaller and more slender species than the preceding, 

 measuring only 3,5 — 6 mm. It also 

 lacks ocelli. The mandibles are 

 somewhat narrower at the mas- 

 ticatory border than through the 

 base, the first funicular joint of 

 the antennie is longer than the 

 two succeeding joints together 

 and the punctuation of the head 

 and thorax are somewhat sparser. 



1 have seen ten workers 

 which agree with Mayr's des- 

 cription, two from the Klebs Coll. 

 (K. 817 and K. 794) and eight 

 from the Geolog. Inst. Koenigs- 



berg Coll , namely: No. 319/7605 (Mayr's type), XXB 29, XXB 

 4164, B 261, XXB 1048, B 18545 and two without a number. The 



Fig. 12. Sima angustata Mayr. 

 Worker XXB 29. 



