schaeffer: donaciini of the new world. 73 
This variety and caerulea are very much ahke and certain specimens 
of the latter with much reduced femoral armature may cause a little 
trouble as to its correct place. The former has a narrower prothorax 
and the antennal joints, posterior femora and hind tarsi are longer than 
in caerulea. 
DONACIA HYPOLEUCA Lac. 
Elongate, depressed; color of upper surface yellowish-testaceous 
to brown with a more or less metallic tint, head and prothorax generally 
more distinctly metallic; antennae pale, joints at apex more or less 
infuscate; legs pale, upper part of femora black; body below entirely 
pale reddish-yellow or mesosternum, metasternum and first ventral 
segment black at sides. 
Head densely and finely punctate, feebly constricted behind the 
eyes which are large and prominent; median line deeply impressed; 
antennae elongate, third joint longer than the first and nearly as long 
as the fourth joint. 
Prothorax as long as wide at apex; generally narrower at apex than 
at base; anterior angles distinct though rarely slightly prominent; 
posterior angles prominent; lateral tubercle indistinct or entirely absent; 
anterior transverse impression absent; median line fine, occasionally 
faint; ante-basal impression broad but shallow; surface rather dull or 
feebly shining, very finely alutaceous and with scarcely any punctures 
except occasionally along the median line. 
Elytra about twice as long as wide at base; strial punctures moder- 
ately large and little smaller towards apex than near base; intervals 
flat, but convex near apex, smooth and shining; apex truncate, outer 
angle distinct, obtuse. 
Body beneath very finely and densely pubescent with very short, 
white silken hairs ; side pieces of prosternum with a rather large pubescent 
space near the anterior coxae; mesosternal process between the middle 
coxae as wide or nearly as wide as the coxal cavities; middle tibiae normal. 
Length: 8-9 mm. 
Male: Last ventral segment truncate and distinctly depressed at 
middle of apex ; last dorsal truncate at apex ; posterior femora extending 
slightly beyond the apices of elytra, distinctly clavate in about apical 
half and armed below with a rather short, acute tooth; anterior tarsi 
dilated, stout, first joint slightly shorter than the next two; middle 
tarsi slightly dilated; posterior tarsi normal. 
Female: Last ventral segment sub-truncate and occasionally feebly 
emarginate at apex; last dorsal segment elongate, gradually converging 
