388 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Sides of head of worker usually converging anteriorly, posterior 
border of head of worker and female straight or convex or at 
most very feebly excised. Basal border of mandibles without 
vestiges: 1ob tteetiat pablo nklaiel slo 0 gated) a 4 
4. Body of worker robust. Head of largest individuals not or 
scarcely longer than broad. Funicular joints 2-3 longer and 
more slender than joints 6-8. Petiole usually with rather sharp 
border. Body opaque, color of species light or dark red with 
brown: orblack<easter HAA Pie sa a. og 5 
Body of worker more slender. Head of largest individuals usu- 
ally distinctly longer than broad. Funicular joints 2-8 only 
slightly more slender than joints 6-8. Petiole usually narrow, 
rather thick and with blunt border. Color and sculpture 
diverse thi. ee dies Geen oa Mai). | 6 
5. Female larger than the largest workers, measuring 6-11 mm. 
rufa group. 
Females not larger and sometimes even smaller than the large 
workers, measuring only 4-6 mm............ microgyna group. 
6. Thorax of worker rather short. Median joints of funiculi usually 
less than 14 times as long as broad; scapes stout, distinctly 
curved at the base. Petiole flattened behind. Stipes of male 
genitalia but slightly longer than the volsellae and sagittae. 
fusca group. 
Thorax of worker longer. Median joints of funiculi more than 
14 times as long as broad; scapes slender, scarcely curved at the 
base. Petiole convex behind. Stipes of male genitalia much 
longer than the volsellae and sagittae. 
Subgenus NEororMica, subgen. nov. 
SuBGENUS FoRMICA. 
SANGUINEA GROUP. 
Workers. 
10: (Palaearetie tomas: iedoaaeuenteroxtailerw tar! tacts: bs been eee 2 
Neéareticutonmaseiatial i vcawededis (lediiicrnectemm Useoche le See 6 
2. Head and thorax rich red or brownish red, head above more or 
less infusea temiabtone. Hates <eald osctaist. Sa riders daaee eee s 
Head and thorax more yellowish red, head above not infuscated .5 
