schaeffer: donaciini of the new world. 153 
behind the eyes, which are moderately prominent; median Hne deeply 
impressed; surface densely punctate-rugose; antennae not extending 
to the middle of elytra, second joint small, third a little longer and nearly 
as long as the rather small fourth joint, which latter is as long or nearly 
as long as the first joint. 
Pro thorax shining, as wide at apex as long; anterior angles distinct, 
more or less acute or rounded, occasionally slightly prominent laterally; 
posterior angles scarcely prominent; lateral tubercles distinct, at sides 
generally moderately prominent, distinctly separated from the disk by 
a rather deep, arcuate impression ; sides slightly converging from behind 
the lateral tubercles to the sub-basal impression; generally with a more 
or less distinctly impressed median line; basal impression usually distinct, 
occasionally feeble, surface densely rugose or more or less distinctly 
strigate-rugose which latter sculpture is often seen more near apex and 
base than at middle; occasionally the entire upper surface is strigate- 
rugose, rarely finely punctate with only a feeble strigate sculpture near 
base. 
Elytra shining, with ante-median impressions rather deep; post- 
median impressions feeble or absent; strial punctures moderate, dis- 
tinctly finer towards apex; surface generally with a few transverse, 
coarse rugae; intervals with a few minute punctures and near apex, 
as usual, more or less rugose. 
Body below closely punctate and very sparsely pubescent with 
very short cinereous hairs; side pieces of prosternum rather coarsely 
strigate, anteriorly occasionally rugose-strigate ; posterior femora ex- 
tending to the apex of the third ventral segment or slightly shorter, 
distinctly clavate, at base slightly narrower than at apex, armed below 
with a very small tooth, which is often absent or represented by an obtuse 
angulation. Length: 6-7 mm. 
Male: First ventral segment more or less distinctly excavated at 
middle; last ventral segment depressed at middle of apex; last dorsal 
segment truncate at apex. 
Female: Last ventral and dorsal segments rounded at apex; lower 
vaginal plate nearly as in emarginata but apparently a little wider. 
Type a male and allotype a female from Yellowstone Park, Wyoming, 
in the Museum collection, paratypes in the National Museum collection. 
Alaska: Sitka, June (Kinkaid in Nat. Mus.). 
British Columbia: Glacier, June (Hubbard and Schwarz). 
Alberta: Banff, June (Hearle in Hopping coll.). 
Wyoming: Yellowstone Park (Brookl. Mus. coll.). 
