og SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 
close small punctures; tegule shining dark reddish-brown; 
wings nearly clear; second submarginal cell strongly narrowed 
above, and receiving the first recurrent nervure about the be- 
ginning of its last third; spur of middle tibizw moderately 
hooked at end; spurs of hind tibie shghtly bent at the end; 
hair on inner side of basal joint of hind tarsi chocolate color; 
abdomen very broad, even basally; first two segments shining, 
with little pubescence, third to fifth more or less covered with 
appressed ochreous hair; hind margins of second to fourth 
segments with conspicuous narrow pale ochreous hair-bands; 
margin of fifth sezment, and apex, with ferruginous hair. Easily 
known from D. diminuta, Cresson, by the much broader abdo- 
men, shiny and mainly naked at base, the naked hind part of 
mesothorax, and scutellum (the hairy anterior third of meso- 
thorax contrasting), the olive-green eyes (blue-grey in dimin- 
uta), the stouter middle spurs, ete. 
Hab.—Los Angeles, Calif. (Davidson). It appears that the 
spurs offer specific characters in Diadasia; thus in D. enavata 
the spur of middle tibie is straight, at most a little bent at the 
end, while in D. australia, rinconis and opuntie it is strongly 
hooked. 
Diadasia nitidifrons, n. sp. 
Male. Length about 845 mm.; black, shining, with long loose 
dull white hair, not hiding the shining surface; eyes dark, prob- 
ably purplish in hfe; elypeus with many small punctures; a 
low keel-hke prominence between the antenne; antenne en- 
tirely dark; mesothorax shining, with numerous minute punc- 
tures; scutellum punctured like mesothorax; teguize warm red- 
dish brown; wings clear; second submarginal cell narrow, nar- 
rowed above, and receiving the recurrent nervure near its 
end; middle and hind femora, and hind tibiw incrassate; basal 
joint of hind tarsi curved, pointed but hardly produced apically ; 
abdomen cordiform or obeonieal, shining black, with thin erect 
pale hair, hind margins of the segments very narrowly pallid, 
no hair-bands, apex bituberculate. Cannot be the male of D. 
jaticauda, because of the quite different character of the punc- 
tuation of the mesothorax. It is easily known from D. diminuta 
and D. apacha by the much less hairy abdomen, appearing black 
to the naked eye instead of whitish. It differs from D. afflicta 
by not having the basal joint of hind tarsi prolonged, and the 
quite different pubescence of the abdomen. 
Hab.— Banning, Calif. (Davidson). It may be remarked that 
D. tricincta, Provancher, from Los Angeles, is placed by Fowler 
as a synonym of D. enavata; I do not believe this can be correct, 
but I am unable to see, from the deseription, wherein D. tric- 
incta differs from D. afflicta. 
