— 196 — 



with the first and second dorsal hicarinate in the iniddle, carina; inchiding one-fourth 

 of the segmental widtli. Legs short, yellow. (^ wiih 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 ^////t'c///^ .-^ armatus. 



This is a singular superscriptidn full of doubt. 



The specimens before me seem to be a variety of Euplectus arma- 

 tus I.ec. differing from the latttr in the sculpture of the verte.x, which 

 has the fovea.* 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 Euplectus integer, which it resembles in the whole form and con- 

 vexity. Besides that, bt)th specimens posses>es other important charac- 

 ters of Trimium. Tliey have only two basal punctures on the elytron 

 and the first dors.il and seconti ventral segment is much longer than its 

 neighbors, whi_h in our 7)iiiiiinii is the case onlv in convexuhivi and 

 the fourth dorsal is not perceptibly longer than the third ; not at all like 

 a true Euplectus, to which E. crinttus belongs, lliis all points to Tri- 

 mium except the stronger border of the abdomen and the form of the 

 aniennal club, which latter is decidedly like Euplectus. This question- 

 able form seems to be exceptionally North American of the Atlantic 

 Slope. According to Renter's schema we would have but one Trimium 

 and the rest would be Trimiopsis. Sharp is unwilling to accept Trimi- 

 opsis. Those doubthd Euplectus would be Trimium except lor the 

 antennae. What is to be done .? 



Constant characters of Euplectus 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 antennie and the third basal ely- 

 tral puncture, together with the depressed general form. Constant char- 

 acters o{ Trimium are the varying subequal, dorsal and ventral segments, 

 the wanting prolongation of the fourth dorsal, which is connate with the 

 last segment of theantennal club, and the Batrisus-shaped form of the body 

 and two basal elytral punctures. This schema excludes the E. 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, genre convergent, 

 eyes not prominent, base impressed in the middle, frontal margin straight, a little 

 more than half as wide as tlie width across the eyes, the fovere in a line through the 

 mi<ldle of the eye, mutually less than twice distant as either from the eye, circuni 

 ambient sulcus dibtinct, shallow, antennal tubercles small. Antenna' one-half longer 



