1928] 
Bees Collected by Nathan Banks 
175 
treated this as a variety or race of H. mexicanum (Cresson). 
This cannot be correct as I possess a male paratype of H. mexi- 
canum and find it to differ radically in the sculpture of the first 
two abdominal segments, which have stronger, sparse or well 
separated punctures. 
Dianthidium banksi sp. n. 
Female. Length 5 mm. (abdomen curved downward); 
narrow, head and thorax very coarsely punctured; markings of 
head, thorax and abdomen red, probably yellow in life; red 
marks of head confined to band along inner orbits, from level of 
middle of clypeus to more than half way up front, and an entire 
occipital band not going much below tops of eyes; scape red in 
front third antennal joint yellow on outer side, flagellum red 
beneath; tubercles with a small spot; anterior margin of meso- 
thorax with a very broadly interrupted red band; scutellum and 
axillae red; tegulae black; wings very dark; anterior legs yellow- 
ish ferruginous in front; middle knees and tibiae in middle red- 
dish; hind legs black; abdomen finely punctured; first segment 
with a large red spot on each side, second with a short transverse 
stripe on each side, third to fifth with entire bands; ventral 
scopa white. The sides of metathorax are smooth and polished. 
Barro Colorado, June 20. Resembles D. quadrimaculatum 
Ckll. (Bolivia) in most respects, differing conspicuously by the 
black tegulae and mainly black scape. Resembles D. gualanense 
Ckll. (Guatemala) by the black tegulae, but differs by the light 
scutellum and axillae. The three species are very closely allied. 
Geratina reducta sp. n. 
Female. Length about 5 mm.; head and thorax highly pol- 
ished, smooth, dark olive green; abdomen very faintly greenish, 
hind margins of segments 3 to 5 obscurely reddish; legs ferru- 
ginous, femora dusky, with a more or less evident pale stripe in 
front. Head round seen from in front; mandibles red in middle; 
labrum pale red, binodose; clypeus with a very broad ivory- 
colored band, broadly rounded above, somewhat constricted in 
