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Psyche 
[Vol. 87 
following modification of Mitchell’s (1962, p. 5) key to genera of 
eastern United States Megachilidae: 
11. Metasomal (=gastral‘) tergum I with anterior surface broadly 
concave, distinctly separated from dorsal surface by line or 
carina .12 
Metasomal tergum I with anterior surface at most narrowly 
concave or merely sulcate medially, not separated from dorsal 
surface by line or carina .13 
12 (11). Anterior concavity of metasomal tergum I lined dorsally by 
sharply carinate rim; anterior surface of mesepisternum not 
separated from lateral surface by carina . Heriades 
Anterior concavity of metasomal tergum I not lined by distinct 
carina; anterior surface of mesepisternum nearly impunctate, 
separated from lateral surface by carina . Ashmeadiella 
13 (11). Propodeum with distinct, horizontal, pitted or rugose basal 
zone; form slender, shortest distance between tegulae equal to 
or less than length of mesoscutum .14 
1. =abdominal of Mitchell (1962). 
