1930 ] 
A New Bee of the Genus Colletes 
219 
A NEW BEE OF THE GENUS COLLETES 
FROM PANAMA 
By Myron Harmon Swenk 
University of Nebraska, Lincoln, Neb. 
In a lot of bees of the genus Colletes belonging to the 
British Museum, I found a well-marked new species, which 
may be described as follows: 
Colletes isthmicus sp. nov. 
9 . Length 8 mm. Black. Head nearly one-third wider 
than long (57 x75), the distance between the lower orbits 
only slightly (about one-tenth) less than the interorbital 
space on the vertex (42:38). Clypeus shining, convex with 
a median feebly sulcate area, coarsely striate-punctate ex- 
cept just before the apical margin which is smoothish, 
slightly reflexed and feebly medially emarginate. Supra- 
clypeus shiny, coarsely and closely punctured except on a 
small, median, impunctate spot. Face dullish, densely and 
shallowly, rather finely punctured, the foveas short and 
narrow, scarcely encroaching on the vertex, but the smooth, 
dullish internal portion crossing the depressed sides of the 
vertex as an impunctate band contiguous to the orbital 
summits. Vertex about ocelli shiny, finely and rather 
closely punctured, elevated. Cheeks shiny, sparsely indis- 
tinctly punctured, thinly clothed with simple, white hairs 
posteriorly. Malar space minutely lined, about one-third 
as long as wide or nearly that (3x10). Pubescence of 
face thin, very short, minutely plumose and grayish white 
in color, with longer, finely plumose, erect, sparse black 
hairs intermixed below the antennal level, the edges of the 
clypeus and supraclypeus with mixed black and yellowish, 
simple, suberect hairs, the clypeus nearly bare, its sparse 
hairs like those on its margins only shorter. Vertex with 
mixed black and whitish, thin, erect, plumose hairs, occiput 
