1852.) 3 167 
Exszxus Er. 
1. E. morulus, niger nitidus, parce pubescens, thorace subtransverso, 
lateribus et basi rotundato, elytris impunctatis, abdomine brevioribus, abdo- 
minis Sure flavo-marginatis, clypeo pedibusque anterioribus testaceis. 
Long. - 
One apeuimens Missouri Territory. The antennz are piceous, with the infe- 
rior margin pale. 
2. EK. apicalis Er. Hntorm: 119. Malachius apicialis Say, Journ. Ac. 
Nat. Sc. 5, 170. 
Southern States, very abandant; the elytra of the female are entirely black. 
It is the Malachius melanopterus of Dejean’s Catalogue. 
3. E. bicolor, niger, tenuiter cinereo-pubescens, capite, thorace anten- 
narum basi pedibusque flavis, elytris subtiliter alutaceis. Long. -07. 
One male, from Georgia, with the tip of the elytra yellow and hamate as in 
the preceding species, from which it differs principally by its yellow head. 
4. E. pusillus. Malachius pusillus Say, Journ. Ac. Nat. Se. 5, 170. 
Southern States; the male has the tip of the elytra yellow and hamate ; the 
female resembles very much Anthocomus granularis Er., but is distinguished at 
once by its bluish color and densely alutaceous elytra. 
5. E. oblitus, niger, vix cyanescens, tenuiter cinereo-pubescens, thorace 
convexo, subtilissime punctulato, subtransverso, lateribus et basi rotundato, 
postice subangustato, elytris convexis subtilissime punctatis, antennarum basi, 
pedibusque flavis. Long. -07. 
Middle and Southern States. Differs from the preceding by its less transverse 
more convex, and finely punctured thorax; the male, as usual, has the tip of 
the elytra pale colored and hamate ; in the female the elytra are much dilated 
behind. ; 
6. KE. submarginatus, longiusculus, wneo-niger, tenuiter pubescens, 
thorace subtiliter alutaceo non transverso, versus basin angustato, basi rotun- 
data obsolete rufescente, elytris vix dilatatis.depressiusculis, obsolete rugosis, 
abdomine brevioribus. Long. -06. 
One specimen, Colorado River, California. The antenne and tibiz are testa- 
ceous at base. \ 
7. E. minutus, Malachius minutus Mels. Pr. Ac. Nat. Sc. 2, 305. 
Pennsylvania. This species is unknown to me. It is described as being 
-black, with the feet, antepectus, head and thorax rufous, the latter with a 
dusky vitta. It may be an Anthocomus, but from its small size, the reference 
to this genus is probably correct. 
Acuetus Lec. 
Antenne 11-articulate, maris pectinate. Clypeus brevissimus, indistinctus. 
Labrum parvum transversum, breve. Palpi maxillares breves, articulo 4to apice 
acuminato. ‘Tarsi antici maris articulo 1mo inferno, 2240 obliquo. 
' IT have only males of this genus, which differs from: Ebzus by the first joint 
of the anterior tarsi being inferior, and almost indistinct; the tip of the elytra 
is not impressed ; the-ventral segments of the abdomen are entirely corneous. 
The insect has somewhat the appearance of Malthinus, but with longer elytra. 
1. A. nigrellus, niger, nitidus, vix pubescens, thorace valde transverso, 
capite vix latiore, angulis omnibus rotundatis, posticis explanatis, elytris thorace 
paulo latioribus, subtilissime vix rugosis. Long. °11. 
Two males from Eagle Harbor, Lake Superior. The posterior tibie are 
slightly bent inwards, and the joints of the antenne after the 4th, are triangular, 
with the internal angle much prolonged, so that the organs become tolerably 
strongly pectinate. 
