134 BROOKLYN MUSEUM SCIENCE BULLETIN 3. 3. 
Prothorax about as wide at apex as long; anterior angles distinct, 
occasionally slightly prominent; posterior angles distinct, feebly promi- 
nent in some specimens; lateral tubercles moderate in size, distinctly 
separated from the disk by a more or less deep impression; sides below 
the lateral tubercles generally feebly arcuate and more or less distinctly 
converging towards base, or almost straight, parallel ; median line more 
or less distinct or absent ; surface sculpture variable from dull, distinctly 
alutaceous with sparse, moderate punctures to smooth shining with 
sparse punctures intermixed occasionally with smaller punctures or 
shining with more or less dense rugose sculpture, and mostly without 
punctures. 
Elytra with more or less distinct impressions, the post-median 
generally faint or absent ; strial punctures moderately large, finer towards 
apex; surface more or less shining, with or without coarse, transverse 
rugae; intervals with or without fine punctures. 
Body below closely punctate and sparsely pubescent with short, 
whitish or cinereous hairs; side pieces of prosternum rather finely 
strigate-rugose, the strigation generally less distinct at about apical 
half than at basal half; posterior femora not strongly incrassate, at 
base not or feebly narrower than at apex, armed below with a moderately 
large or large acute tooth in both sexes. Length: 6-8 mm. 
Male: First ventral segment with a more or less deep and wide 
impression along middle; last ventral segment distinctly depressed at 
middle of apex ; last dorsal segment generally deeply emarginate at apex. 
Female : Last ventral segment rounded at apex ; last dorsal segment 
distinctly emarginate at apex; lower vaginal plate rather narrow, 
parallel for some distance and then slightly arcuately converging to 
apex into a sharp point (pi. V, fig. 14). 
This variable species is divisible in the following three more or less 
distinct forms. The differences based principally on the form and 
sculpture of prothorax are more pronounced in the females than in the 
males. 
Typical emarginata in which the sculpture of prothorax is different 
in the two sexes will be known by the following characters : 
Male: The prothorax is generally distinctly converging to base 
behind the lateral tubercles, surface more or less distinctly and very 
finely alutaceous, occasionally feebly shining, on the disk are a variable 
number of minute punctures and intermixed with these a few larger 
punctures, the minute punctures often more or less transversely and 
longitudinally confluent, producing a more or less distinct finely rugulose 
