82 
PSYCHE 
[ August 
ing for their specific standing on an assemblage of minor characters which, 
while probably quite sufficient for their establishment, render their tabulation 
somewhat unsatisfactory because of their gradational nature. Absolute char- 
acters are present only in the two extremes of our series — acncus and semio- 
pacus. 
TABLE OF SPECIES. 
I'ront 5-striate between the Itroad lateral grooves. 
Legs and antennae entirely pale; head much wider than the prothorax, the 
sides of the latter deeply sinuate posteriorly i acncus. 
{ Legs dark or with the tibiae ak.ine paler, antennae jjalc at base only.) 
b'lytra each with one a])ical annulate jnmeture. 
I'orm generally stouter, sides of prothorax more strongly sinuate behind ; 
elytral striae complete, the inner ones, however, faintly impressed at 
ajjex ; til>iae more or less ])ale ; last two joints of maxillary and terminal 
joint of labial palpi dark, the latter quite broadly dilated and truncate 
in the male 2 semistriatus. 
Form less stout, sides of prothorax less sinuate behind, inner elytral 
striae nearlv or quite effaced at apex ; palpi dark except at extreme base, 
tlie terminal joint of the labial palpi but slightly modified in the male. 
Less elongate, prothora.x more transverse, elytra parallel, more 
strongly punctured and less bronzed, tibiae usually dark, sometimes 
pale 3 aquaticus. 
More elongate, prothorax less transverse, elytra a little narrowed 
anteriorly ; less strongly punctured and more bronzed ; tibiae always 
dark 4 borealis. 
Elytra each with two apical annulate punctures. 
Elytra usually entirely black bronzed, rarely with pale apical stripe. 
Second discal stria of the elytra more remote from the fifth than from 
the sutural stria, striae becoming rapidly obsolete behind the middle ; 
tibiae dark 5 simulator. 
Second discal stria of the elytra less remote from the fifth than 
from the sutural stria; striae less fhie and in part entire; tibiae 
])aler 6 uoi'cmstriatus. 
Elvtra with a broad and entire yellow lateral vitta occupying the lateral 
interstriae. 
I'orm more elongate, prothorax less transverse and more narrowed 
