1970] 
Eichwort — Mason Bee 
195 
origin (Michener, 1947). However, only one native American sub- 
genus, Alcidamea , also contains Old World species. The genus is 
absent in the Neotropical region south of Mexico. 
The above subgenera (except Isosmia , which was described as a 
subgenus of Anthocopa by Michener and Sokal, 1957) can be 
distinguished by means of the subgeneric keys to Anthocopa and 
Hoplitis in Hurd and Michener (1955). Hoplitis {Hoplitis ) , based 
on anthocopoides , runs to couplet 8 of Hurd and Michener 1 ’ s key to 
Hoplitis based on males, if the second alternative of couplet 6 is 
changed to read: 
Seventh tergum produced to a pointed or truncate apex; antennae 
modified ; scape often thickened, the flagellum flattened and the last 
segment often pointed; clypeus with the usual long hairs 7 
The remainder of the key should be changed as follows: 
8(7) Antennal pedicel almost completely hidden in concavity at end 
of scape when antennae are in normal position ; last antennal 
segment bent and drawn out to a point Alcidamea 
Antennal pedicel at least partly exposed; last antennal segment 
rounded, or if pointed as in Alcidamea , posterior coxae each with 
broad ventral tooth 9 
9(8) Seventh metasomal tergum produced to median point or tri- 
dentate; posterior coxae each with broad ventral tooth; Western 
Dasyosmia 
Seventh metasomal tergum produced to subtruncate apex (Fig. 6) ; 
posterior coxae unmodified; Northeastern Hoplitis s.s. 
In Hurd and Michener’s (1955) key to subgenera of Hoplitis 
based on females, Hoplitis s.s. runs to couplet 7. The remainder 
of the key, excluding Acrosmia (now in Proteriades) , can be changed 
as follows: 
7(5) Mandibles short and broad, not narrowed medially and apices 
much narrower than eye; first flagellar segment of antennae sub- 
equal to pedicel A Icidamea 
Mandibles longer and narrowed medially (Fig. 4) or apices nearly 
as broad as eye; first flagellar segment longer than pedicel 8 
8(7) Clypeal margin not crenulate, impunctate; apices of mandibles 
nearly as broad as eye; Western Dasyosmia 
Clypeal margin crenulate (Fig. 2), punctate to apex; apices of 
mandibles much narrower than eye; Northeastern Hoplitis s.s. 
