76 
Psyche 
[March 
other Hylaeus, and each contained a larva. One larva became a 
prepupa on 6 July, a pupa on 7 July, and an adult female on 14 July; 
the other larvae were small and died. 
Nests had from 1 to 3 Hylaeus cells (x = 1.7, n — 6 nests), each 
in a different Lasioglossum cell (Fig. 2). Both Hylaeus cells which 
were measured were 5 mm long and 3.5 mm in maximum diameter 
and at the ends of Lasioglossum cells. The walls of the cells had old 
wax-like lining deposited by L. zephyrum (Batra, 1966). H. bis- 
inuatus laid down two other cell linings to form its cells : ( 1 ) a very 
thin “cellophane” layer visible under a microscope (30X ) only when 
light strikes it at a certain angle and (2) a slightly thicker “cello- 
phane” layer over the first one. This thicker layer also covered walls 
of lateral burrows and parts of main burrows. A sheet of what ap- 
peared to be this same second layer closed off each cell and with the 
unaided eye the halictine cells appeared to be constricted where such 
a sheet was placed. Complete removal of the cellophane-like material, 
however, shows the unmodified form of the halictine cell. 
H . bisinuatus used cells of L. zephyrum that were 0.8 to 4.5 cm 
(x = 3.3 cm, n = 6 nests) from the nest entrances. Since L. 
zephyrum constructs cells this close to the surface of a soil bank 
only in spring or early summer, the Hylaeus must have used early- 
season Lasioglossu/n cells made in the year of this study or possibly 
in the previous year. 
Acknowledgments 
I thank Mr. Roy R. Snelling of the Los Angeles County Museum 
of Natural History for identifying Hylaeus bisinuatus. He and Drs. 
Charles D. Michener and William J. Bell and Ms. Marjorie R. 
Chabot made important suggestions regarding this note. It is a 
byproduct of National Science Grant GB-38502 (W. J. Bell and 
C. D. Michener, coprincipal investigators). 
Literature Cited 
Batra, S. W. T. 
1966. The life cycle and behavior of the primitively social bee Lasio- 
glossum zephyrum (Halictidae). Univ. Kansas Sci. Bull. 46: 
359-423. 
Ferton, C. 
1923. La vie des abeilles et des guepes, oeuvres choisies, groupees et 
annotees par Etienne Rabaud et Francois Picard. Etienne Chiron, 
ed., 40 Rue de Seine, Paris. 376 pp. 
