No. 22.] HYMENOPTERA OF CONNECTICUT. 595 



2. Color deep red, gaster black 3 



Color light red, gaster brown 



sanguinea subspecies subintegra 



3. Head and thorax not infuscated; slaves nearly always present 



in formicaries sanguinea subspecies rubicunda 



Head and thorax often infuscated above; slaves few or entirely 

 absent sanguinea subspecies aserva 



4. Posterior border of head broadly excised exsectoides 



Posterior border of head not excised 5 



5. Body rather stout; head of larger workers usually but little 



longer than broad; second to third funicular joints, much 

 more elongated than sixth to eighth; color red, with brown 



or black gaster 6 



Body more slender and graceful; head of larger workers dis- 

 tinctly longer than broad; second to third funicular joints 

 but little more elongated than sixth to eighth; color rarely 

 as in preceding 9 



6. Petiole broad, with sharp upper border 7 



Petiole narrow, thick and blunt above difficilis var. consocians 



7. Gula, or lower surface of head, with erect hairs 8 



Gula and body without erect hairs . .truncicola subspecies integra 



8. Tibiae with suberect hairs ; females large 



truncicola subspecies obscuriventris 

 Tibiae without suberect hairs; females very small nepticula 



9. Middle funicular joints more than one and one-half times as 



long as broad; scape very slender and nearly straight; 

 petiole with convex anterior and posterior surfaces and 

 blunt upper margin; body smooth and rather shining 



(pallide-fulva) 10 



Middle funicular joints usually less than one and one-half 

 times as long as broad; scape distinctly curved at base; 

 posterior surface of petiole flat, body more densely pubes- 

 cent (fusca) J 3 



10. Gula and petiolar border with erect hairs 



Gula and petiolar border without erect hairs 12 



11. Yellowish or reddish brown, gaster but little darker, gula 



and petiolar hairs numerous 



pallide-fulva subspecies schaufussi 

 Somewhat smaller and darker, with only a few erect hairs on 

 gula and petiolar border pallide-fulva schaufussi var. incerta 



12. Head and thorax deep reddish; gaster brownish black, 



shining pallide-fulva subspecies nitidiventris 



Head and thorax as well as gaster dark brown or piceous, sur- 

 face more opaque pallide-fulva nitidiventris var. fuscata 



13. Gula without erect hairs *4 



Gula with erect hairs x 5 



