16 
with the first and second dorsal bicarinate in the middle, carinze including one-fourth 
of the segmental width. Legs short, yellow. j' with the last ventral nearly circular 
and an inconspicuous transverse impression at the base of the penultimate segment. 
Linn County, Iowa. 
Very distinct by the small head and the form and sculpture of the 
prothorax. 
Euplectus ? nova species? or variety of Luplecius ? armatus. 
This is a singular superscription full of doubt. 
The specimens before me seem to be a variety of Euplectus arma- 
fus Lec. differing from the latter in the sculpture of the vertex, which 
has the fovez in one specimen not connected by a sulcus with the trans- 
verse frontal impression, in the other there is a faint trace visible, most 
as in Luplecius integer, which it resembles in the whole form and con- 
vexity. Besides that, both specimens possesses other important charac- 
ters of Zrzmium. ‘They have only two basal punctures on the elytron 
and the first dorsal and second ventral segment is much longer than its 
neighbors, which in our Zrimium is the case only in convexulum and 
the fourth dorsal is not perceptibly longer than the third ; not at all like 
a true Luplectus, to which £. crinitus belongs. This all points to Z777- 
mium except the stronger border of the abdomen and the form of the 
antennal club, which latter is decidedly like Zuplec/us. This question- 
able form seems to be exceptionally North American of the Atlantic 
‘Slope. According to Reitter’s schema we would have but one Zrimium 
and the rest would be Z77mzops’s. Sharp is unwilling to accept Zyzmr- 
opsis. Those doubtful Luplectus would be Zrimium except for the 
antenne. What is to be done? 
Constant characters of Lwf/ec/us are the prolongated fourth dorsal, 
which in reality is composed of two united segments, and is not connate 
with the last segment, the form of the antennz and the third basal ely- 
tral puncture, together with the depressed general form. Constant char- 
acters of Zrimium are the varying subequal, dorsal and ventral segments, 
the wanting prolongation of the fourth dorsal, which is connate with the 
last segment of the antennal club, and the Batrisus-shaped form of the body 
and two basal elytral punctures. This schema excludes the Z. arcuatus, 
integer etc. which should be set down as Pseudotrimium (Pseudoplectrus ? 
Reitter) having the 4th and 5th dorsal connate and six ventrals. 
Trimium thoracicum n. sp. Saturated yellow, form slender, pubescence, very 
fine, abundant. Length, 0.9 —0.95 mm. 
Head narrower than the prothorax, one-fifth wider than long, genze convergent, 
eyes not prominent, base impressed in the middle, frontal margin straight, a little 
more than half as wide as the width across the eyes, the foveze in a line through the 
middle of the eye, mutually less than twice distant as either from the eye, circum 
anybient sulcus distinct, shallow, antennal tubercles small. Antennze one-half longer 
