DIADASIA PATTON; A GENUS OF BEES. 
T. D. A. COCKERELL. 
THE genus Diadasia was first described by Patton in the 
Bulletin of the United States Geological Survey (vol. 5, p. 475). 
The type is the Melissodes enavata of Cresson, which, as 
Patton showed, is nearer to Anthophora than to Melissodes. 
The genus occurs in our southwestern States, and is, undoubt- 
edly, of neotropical derivation. Ashmead has recently placed 
it as a synonym of the South American Ancyloscelis Latreille, 
but it appears to me to be sufficiently distinct. 
Our species of Diadasia have not hitherto been tabulated, and 
as I have now seen all the species but one, I offer tables for 
their identification. The species of Cresson are in the collec- 
tion at the Philadelphia Academy ; I have been permitted to 
borrow cotypes from that institution, through Mr. Viereck, and 
this has enabled me to clear up several doubtful points. — Ez- 
technia toluca (Melissodes toluca Cresson) and Daszapis ochracea 
Ckll., are included in the table, as the first has for some years 
stood in our lists as a Diadasia, while the latter is often mis- 
taken for a species of that genus. 
FEMALES. 
Hair of head and thorax above short and dense, orange fulvous ; abdomen 
with four clean cut bands of fulvous tomentum on a black ground ; outer 
side of basal joint of hind tarsi with very long, strongly plumose, dark 
chocolate-colored hairs ; inner side of this joint with shining dark ferru- 
ginous hair ; en red ; "m all dark; front rough with very close 
punctures ; sumichrasti (Cresson). 
Hair of thorax not hk a: or if ronk abdomen not thus banded 1. 
1. Scopa on outside of hind legs dark gray or blackish (in €— am: on 
basal part of tibize.) 2. 
Scopa on outside of hind SER white, or not gray or r blackish 4- 
2. Very small; less than 8 mm. long; abdomen with narrow Het of 
tomentum on apical margins of segments; mesothorax and scutellum 
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