OF WASHINGTON. 23 



ID. Thorax with only the meta-notal suture present, indicated by a 

 transverse row of punctures ; head not bilobed, 



Subfamily III. ACANTHOSTICHIN^ 



11. Pygidium armed with a row of fine teeth along the apical margin; 



front wings with three cubital cells, 



Subfamily III. ACANTHOSTICHIN^: 



12. Submedian cell in front wings shorter than the median cell, the 



transverse median nervure uniting with the median vein before 



the basal nervure 13 



Submedian cell in front wings distinctly longer than the median 



cell, the transverse median nervure uniting with the median 



vein beyond the basal nervure 



Femora neither flat nor compressed Subfamily I. ECITONIN^E 



Femora abnormally flat or compressed. Subfamily II. DORYLIN.E 



13. Femora abnormally flat or compressed ; mandibles more or less 



sickle-shaped or conical, without teeth or a masticatory edge, 



Subfamily II. DORYLIN^: 



Femora normal, neither flat nor compressed ; mandibles more or 

 less triangular, and with a broad masticatory edge, 



Subfamily III. ACANTHOSTICHIN^E 



Subfamily I. ECITONINI. 



1893. 2me Tribu : Ecitonii Forel, Ann. Soc. ent. Belgique, xxx, p. 163. 

 1895. 2 Tribus : Ecitonii Emery, Zool. Jahrb. Syst., vm, p. 765. 



This subfamily I have divided into two minor groups or 

 tribes, as follows : 



TABLE OF TRIBES. 



1. Workers 2 



Females 3 



Males 4 



2. Mesonotal suture wanting or never distinctly defined. 



Antennae 12-jointed; inner tibial spur pectinate. Tribe I. Ecitonini 

 Antennae 10 or n-jointed; inner tibial spur apparently simple, 



Tribe II. yEnictini 



3. Wingless; head not distinctly bilobed. 



Eyes represented by a single ocellus a little behind the lateral mid 

 dle of the head ; node of petiole transverse, concave medially and 

 posteriorly, the upper hind angles prominent; antennae 12-jointed, 



Tribe I. Ecitonini 



Eyes absent or represented by a single ocellus before the lateral 

 middle of the head; node of petiole a little longer than wide; 

 antennae lo-jointed, or rarely n-jointed Tribe II. /Enictini 



4. Front wings with three cubital cells Tribe I. Ecitonini 



Front wings with tivo cubital cells Tribe II. /Enictini 



