194 
REVISION OF TliE BUPRESTIDiE OF THE UNITED STATES. 
may be isolated by characters to form a group of lower value than the three into which I 
divide the genus, and which may be thus distinguished. 
A. Corpus clongatum, elytris oblique attenuates et prcocipue valdc prolongatis, apice smpissime integris; pros- 
terno mctasterno et abdominis segmento primo late sulcatis; mesosterno baud punctato; antennis articulis 2 et 3 
xqualibus. Wares segmento ventrali ultimo truncato cmarginato, tibiis intermediis intus late emarginatis, et 
supra medium dente magno armatis. Fominas segmento ventrali rotundato, acute biinciso. 
a. Elytra apice integra; abdomen art. ult. ventrali canaliculato lineis duabus lasvibus muuito. Sp. 1-3. 
b. Elytra apice bidentata; abdomen art. ult. vix canaliculato ... 8p. 4. 
B. Corpus clongatum, elytris oblique attenuatis paulo vel vix prolongatis, apice bidentatis (cxcepta spec. 4,) 
abdominis segmento lmo plus minusve sulcato; mesosterno haud vel vix punctato; antennis articulo 2udo breviore. 
Wares segmento ventrali ultimo truncato emarginato, tibiis intermediis scepissime intus late cmargiuatis et supra 
medium dente armatis. Feminas sicut in A. 
* Frons haud transversim cariuata. 
c. Wetasternum sulcatum. 
a. Prostcrnum convexum. - - - - - Sp. 5. 
/}. Prostcrnum sulcatum. - - - - - Sp. G—9. 
d. Wetasternum haud sulcatum. ------ Sp. 10 11. 
* * e. Frons inter antennas transversim carinata. ----- Sp. 12. 
C. Corpus crassiusculum, elytris oblique magis abrupte attenuatis et brcviter prolongatis, intcgris vel vix biden¬ 
tatis; antennis articulo 2ndo breviore. Sexus differentia varia. 
* Abdomen segmento ventrali ultimo haud costato. 
f. Sternum late sulcatum, mesosternum rude punctatum, (abdominis segmento ultimo mavis truncato 
emarginato.) -------- Sp. 13—15. 
g. Sternum parum sulcatum,mesosternum parce punctatum (abdominis segmento ultimo maris?) Sp. 1G—17. 
h. Prosternum planum cum mesosterno dense punctatum, (abdominis segmento ultimo femiuas rotundato, 
maris truncato.) - -- -- -- - Sp. 18-20. 
i. Sternum valde sulcatum, mesosternum parce punctatum, (abdominis segmento ultimo maris rotundato.) 
Sp. 21—22. 
* * k. Abdomen segmento ultimo acute bicostato, (maris truncato, haud cmarginato.) Sp. 23. 
A.—a. 
1. D. p r o 1 o n g a t a, griseo-xnca, saspc pruinosa, thorace latitudine plus duplo breviore, lateribus autice valde 
rotundatis postice subsinuatis, punctato, canaliculato, utrinque pone medium oblique profunde impresso; elytris 
striis profundis, interslitiis spatiis oblongis obscurioribus lasvibus parum clevatis, postice oblique attenuatis, pro¬ 
longatis, apice rotundatis vix divaricatis; subtus parce pubesccns. Long. -77—'85. 
Lake Superior, Nebraska, and Wisconsin. From the other species of this group, it differs 
by the thorax being shorter, much narrower and more rounded in front, more punctured, 
and with the dorsal channel and oblique impressions, more strongly marked. As in the 
neighbouring species, the pro- and metasternum, and first ventral segment are broadly and 
deeply sulcate, and the divided mesosternum very sparsely punctured: the last ventral 
segment has two smooth longitudinal spaces. The last ventral segment of the male is 
