NORTH AMKKICAN COLEOPTERA. 
175 
the apex; fonn convex, second and tliird antennal joints subec^nal : posterior 
femora dentate in both sexes. 
Male, pygidium distinctly truncate. Female, py>ridium rounded. 
Varies from typical bronze color to a dark blue ; it also varies in 
the depth of the thoracic grooves or channels. 
Length 7 — 9inin.; .28 — .36 inch. Habitat — Mass., N. Y.. Pa., 111., Kan., Can., 
Mich. About thirty specimens examined. 
I>. I'lila Say. Original description. 
“Dull metallic rufous, front destitute of lateral impressed lines. Body totally 
dull rufous with a metallic gloss, particularly on the elytra. Head dusky, almost 
opaque, with much crowded, very small punctures, no appearance of tubercles, 
a very distinct impressed frontal line extending down between the antenufe, no 
appearance of impressed lines near the eyes; anteunse somewhat paler than the 
body, third joint longer than second ; thorax longer than broad, minutely punc- 
tured, longitudinal line very distinct, a transverse impressed line on the posterior 
submargin, lateral tubercles rather prominent, obtuse, tubercle of the anterior 
angle distinct from the large tubercle, acute, elytra hardly obviously inequal 
near the suture, with strise of punctures, tip decurved, almost truncated, or ob- 
tusely rounded; beneath, in a particular light, dull silvery sericeous, feet rufous. 
Length more than 3-16 inch.” 
AVith this species must be united Kirhyi Lac., described as follows : 
“ Thorax convex, legs short and stout, posterior femora elliptical, armed be- 
neath with a strong tooth, not attenuate at base. Subelongate, cupreo-seneous, 
shining; thorax sparsely punctate cordate, angles rounded, lateral tubercles dis- 
tinct, but barely prominent, a slight channel before the base strongly impressed ; 
elytra scarcely rugose, interstices flat, impressed before the middle; legs and 
autennse rufous, third joint half as long again as the second, the fourth a little 
shorter. Long. .28. 6a. Varies with the thoracic tubercle less distinct.” 
Mesosternum, etc., as in the preceding, and the sexual characters are the same. 
No variations are observed in color, and the insect is readily known by the con- 
vex shining thorax almost destitute of punctuation. 
Length 7 — 7i mm.; .28 —.30 inch. Habitat — Can., N. H., Mass., N. Y., Ohio, 
and one specimen is labeled “Texas.” 
Apparently more rare, the collections examined containing to- 
gether sixteen specimens. 
Synonymy and Bibliography. 
The greater part of the following synonymy is derived from the 
“ Catalogus” of Gemminger and Harold, from Dr. LeConte’s Syn- 
oj)sis, or from Mr. Crotch’s paper. Of the remainder a part is due 
to comparisons made by Dr. Horn with the LeConte types at Cam- 
bridge, and the balance is the result of a comparison of the published 
descriptions. All the older names have been recognized, and in 
some instances those which have been in use have had to give way 
to them. 
