74 BULLETIN G6, UNITED STATES NATIONAL MUSEUM. 



3. Six primary veins from base. 



a. Cubitus and third anal lacking. 



Detached branch of radius between radius and medius; also detached branch 

 of medius behind medius Caenocholax Pierce. 



Detached branch of radius, and one of medius between radius and medius; 

 also branch of medius behind medius Anthericomma Pierce. 



b. Only one anal vein arising from base; second anal appearing as a detached 



branch of first anal Crawfordia Pierce. 



4. Five primary veins from base (costa, subcosta, radius, medius, anal). 



a. One detached branch of medius between radius and medius; cubitus and first 

 anal indicated at base Elenchus Curtis. 



b. One detached branch of medius between radius and medius. . Mecynocera Pierce. 



(Owing to the necessity of forming part of this table from published 

 drawings there is a possibility that the venation has not in every case 

 been interpreted correctly. The venation should not be used for 

 identification unless the other available characters are obscured.) 



FEMALES. 



Table of superf amities, families, and genera based on females. 



1. Spiracles more or less easily discernible, generally prominent; four or five genital 



tubes entering brood canal Superfamily Xenoidea Pierce. 



Spiracles not usually discernible, never prominent 2. 



2. Tubercles of head apical Superfamily Halictophagoidea Pierce. 



Tubercles of head more or less obsolete, ventral; only three genital tubes entering 



brood canal Superfamily Elenchoidea Pierce. 



Superfamily XENOIDEA Pierce. 



1. Head considerably narrower than metathorax at spiracles 2. 



Head not considerably narrower than metathorax at spiracles 5. 



2. Hylechthrid^e: Head not more than one-half as wide as metathorax at spiracles; 



lateral lobes of mesothorax indicating presence of supposed mesothoracic spiracles 

 (according to Saunders) ; lower lip (ventral) overhanging transverse slit; mandibles 



merely 'lobes Hylechthrus Saunders. 



Head often much less than one half as wide as metathorax; no lateral lobes indi- 

 cating presence of suppressed mesothoracic spiracles 3. 



3. Head about one-third width of metathorax at spiracles 4. 



Stylopid^e: Cephalothorax broadly truncate or rounded at apex; head about one- 

 half width of metathorax at spiracles; five genital tubes entering brood 

 canal Stylops Kirby. 



Xenid^e. Cephalothorax almost triangular, lateral margins sinuate; five genital 

 tubes entering brood canal Halictoxenos Pierce. 



4. Stylopid^e (?): Cephalothorax almost triangular, narrowly truncate at apex. 



Halictostylops Pierce. 



5. Cephalothorax with lateral lines extending from mandibles to spiracles. 



Crawfordia Pierce. 

 Cephalothorax with head extending laterally not more than two-thirds of the dis- 

 tance to the spiracles; four genital tubes entering brood canal. 



Xeninse, Homilopinse. 



