yORTH AMERICAX BEEA 
1906] 
NORTH AMERICAN REES OE THE GENERA ANDRENA AND 
MEETTTA IN THE BRITISH MUSEUM.— I. 
HV T. I). COCKERELL, BOULDER, C0L(JR.\UO. 
When, in the summer of 1904, I visited the British Museum, one of my 
chief objects was to e.xamine the types of the American species of Antirena de- 
scribed by E. Smith. These insects, described when comparatively little was 
known about .\merican bees, had always been difficult to identify, and with a 
few e.xceptions the current identifications were open to more or less doubt. 
Some years ago, the Rev. E. D. Morice very kindly sent me a series of notes 
resulting from his e.xamination of them, and these were published in the Cana- 
dian Enioniologist, 1901 ; but further investigation was clearly desirable. I did 
not publish my notes on Andrena along with my other remarks on the British 
Museum bees {Trans. Am. Ent. Soc., 1905), because it was intended to include 
them in a lengthy paper which Mr. Viereck expected to publish in 1905 ; but as 
this work (a review of all the known .American . 4 ndrenae) is likely to be much 
delayed, I give them here. 
Melilta amc'ricana (Smith). 
Ci/issa a?neriiana, Smith, 9 . Length 12 mm. or slightly over; facial fovea; 
apparently very broad, but ill-defined and not hairy ; process of labrum low and 
broadly rounded ; clypeus with a longitudinal median ridge, the upper part of 
which is narrow and grooved, while the lower part is very broad, and shining ; 
rest of clypeus dull, with rather close punctures ; mandibles broad at apex, with 
a short inner tooth ; cheeks ordinary ; mesothorax fairly shining, with quite 
close shallow punctures, which look as if caused by blows from a hammer ; 
mesothorax and scutellum with a good deal of black hair, which, however, is not 
conspicuous, except perhaps at sides of scutellum ; scutellum shining on disc, 
with definite punctures ; postscutellum quite dull, with a curious subtesselate sur- 
face, and posteriorly with long hair ; enclosure of metathora.x triangular and ill- 
defined, slightly wrinkled at base ; tegulae with a conspicuous ferruginous spot ; 
stigma yellowish-ferruginous, small and lanceolate ; second submarginal cell not 
far from square, equally broad above and below, receiving the recurrent nervure 
at its middle ; third submarginal cell very long, narrowed more than half to mar- 
ginal ; middle femora reddish, sharply keeled beneath; hind trochanters without 
any curled floccus ; hair on outer face of hind tibia; rather long and coarse, but 
