The Ants of the Baltic Amber. 59 



are deepest in the middle of their course and fade out towards the 

 base and posterior border of the segment. 



Pilosity like that of the worker. 



Color black; wings brownish, with darker brown veins and stigma. 



Described from five specimens in the Geolog. Insr. Koenigsberg 

 Coll.. four workers (No. 639/ 10 246 — Mayr's type; 67*)/ 10 331, XXB 540, 

 B 5164) and a single female (B 260). All the workers have the body 

 curled up so that the peculiar conical tip of the gaster can be seen 

 iu only one of them. The female, though it has a white film over 

 much of the body, shows the structure of the gaster and pedicel and 

 the sculpture of the different regions very clearly. The left fore wing 

 has a small adventitious cell at the distal end of the second cubital cell. 



Mayr saw only a single, poorly preserved specimen of this ant 

 (No. 639) and was therefore quite unable to appreciate its remarkable 

 characters. He overestimated the length of the worker, which he gave 

 as about 6 mm, and his Figs, 87 and 88 are quite erroneous as may 

 1)6 seen by comparing them with my own. That the species cannot 

 be assigned to the genus Myrmica is evident at a glance, and it is 

 equally clear that none of the recent genera of Formicidse can be 

 made to receive it. In the structure of the head, thorax, petiole and 

 pos'petiole it closely resembles Triglyphothrix of the Old World tropics, 

 but the pilosity, venation and especially the structure of the gaster 

 remove it from this genus. In the character last mentioned, it is 

 unique among the Myrtnicinw and recalls the gastric structure of the 

 small group of Ponerince including the genera Syspliincta, Proceratium, 

 Diacothyrea, Alfaria, Spaniopone and Bradoponera. 



Genus Myrmica Latreille. 

 Myrmica longispinosa Mayr. 



Myrmica longispinosa Mayr, Bcitr. Naturk. Preuss. I. 1868, p. 87, Taf. V, Fig. 86 $; 

 Dalla Torre, Catalog. Hymen. VII, 1893, p. 112; Handlirsch, Foss. 

 Insekt. 1908, p. 874. 



The only specimens of this species I have seen are Mayr's single 

 type (No. 40/316) and an unnumbered specimen in the Geolog. Inst. 

 Koenigsberg Coll. The former is rather poorly preserved, having the 

 body curled up, and in great part enveloped iu a white cloud, together 

 with a small specimen of Iridomyrmex goepperti. In Mayr's opinion 

 the species is closely related to the recent M. sulci)iodis Nyl. of Europe. 

 It shows distinctly the pectinated spurs on the middle and hind tibia. 



