170 
CHARLES W. LENC4. 
the female than in the male, ami more elonjiate and less flattened than in the 
j)receding <;roni). 
pyjiidinm tnincate : /e»iaZe, pygidium obtusely rounded, form broader. 
The sexes are feebly ditterentiated in tliis. 
Le.ucfth 7--10 mm. : .28— .40 inch. Habitat. — Dakota. Wis., Can., N. III., Iowa, 
Col., Ohio, Pa., N. Y., Mass., N. H. 
This species is very abuiulunt on Staten Island at a jtond Itordered 
l)y marshy ground, where grow a nninber of sedges and grasses, on 
whicli the insects principally occur. They wander to the lilv pads, 
but do not occur in ponds where the lilies alone are abundant. I 
therefore conclude that they live on these sedges. Mr. Clarence M. 
Weed has noted their abundance in a similar situation in Ohio ( Bull. 
Ohio Ex. Station, 1889). 
Var. rugosa Lee. — Differs only as stated in the synopsis. The 
specimens 1 have seen are from Lowell, Mass., collected by Mr. 
Blanchard, who has pointed out to me, very kindly, the character 
by which they may be separated. 
I>. porosicolli.s Lacordaire. Original description translated. 
“Elongate, silvery sericeous beneath, above seneons ; antennse riifescent, legs 
variegated rufous and a?neous. Prothorax quadrate, somewhat narrowed behind, 
the angles scarcely distinct; the disc rather flat, the sides deflexed, the entire 
surface finely strigose and cribrately impressed with minute punctures, the dorsal 
channel very narrow, entire. Elytra longer, apex scarcely declivous, moderately 
attemiate, and squarely truncate, finely punctato-striate, interstices very slightly 
though closely transversely strigose. Posterior femora armed beneath with a 
snbobsolete tooth near the apex. Length 4j lines; width ll lines.” 
Mesosternnm narrower than the coxa ; first ventral segment longer than the 
metasternum ; form more slender than any other ; third joint of antennse one and 
a half times the second joint. 
Sexual characters as in the preceding, which it closely resembles, except in the 
minute ]iunctuation of the thorax. 
Length 10 mm. ; .40 inch. Habitat . — Mich., Pa. 
Riu-e, only three specimens examined. 
I>. iequaliN Say. Original description. 
“ Brassy, with two dilated indented subsutural spots on the elytra, and an in- 
dented humeral line; two elevated lines between the eyes. Inhabits Mi.ssouii. 
“ Body jeneous, polished, punctured, glabrous; head with short cinereous jiu- 
bescence, an obsolete, indented line, two elevated tubercles between the eyes, 
extending in a depressed ridge to the ba.se of the antennae, where it is slightly 
more elevated ; eyes black ; antennae clothed with cinereous pubescence, second 
and third joints equal ; palpi and mandibles black ; thorax densely punctured, 
punctures sometimes confluent, a longitudinal indented line, a lateral dilated, 
hardly elevated tubercle before the middle: scutel minutely punctured and rugu- 
lose: elytra with regular series of punctures, surface slightly rugulose; two sub- 
sutural dilated, obsolete, indented spots near the middle and a subhumeral 
impressed dilated line at base; beneath argenteous pruinose; feet cu])reous, 
pubescent, a robust spine beneath the posterior thighs near the tip. Length 
rather less than 7-20 inch. Var. a. Body above cupreous, polished.” 
