OF THE UNITED SI A IT.s. 18 I 



gulata, thorace minus convezo, antrorsum valde angustato, lateribua rotundatis, (vel potiua ad medium 

 obsolete angulatis, ) carina angulari elongata, mil gr >sae punotato, elytria a baai 



tis, parce aubtUiua punotatis, striis interaia obliteratis, antennia p ifis, illia artic i 



aequalibus. Long. -6. 

 '/ u '.us paradoxus Melaheimer, Proc. Acad. N at. So. 2, 152. 



One specimen from Pennsylvania, in Dr. Melsheimer's collection. The Bides of the 

 thorax are so obtusely angulated, that they may almosl bo called rounded: the outer 

 stria 1 of the elytra are punctured and slightly impressed: the inner on is are reduced to 

 small punctures, which are confused with those belonging to the interstices; the thorax 

 has a very slight and short impression at the middle of the base. This species agrees ac- 

 curately with C. prolixus Er, (Germ. Zeitschr. 3, 94J from Mexico, except that the 

 breast and abdomen are not castaneous. 



I! isides these, there are described as occurring in North America, the following Bpecies, 

 which I d > not [> )ss».«s-i, or cannot identify with certainty. 



C. cast an i pes Er. Germ. Zeitschr. •".,'■' >. /' • ,< eusfulvipes Kirby, Fauna Bor. im. 148. 

 C. spadix Er. Germ. Zeitschr. : '.. 103. . ( . \tut Lee. 



C. abdominal is Br. Germ. Zeitschr. 3, L04. 



i'. vetulus Er. Germ. Zeitschr. 3, I 11 "'. 

 Perimecus s i m il is Kirby, Fauna l!>r. Am. 1 UK 



MONOCKKIMDIIS I'.-rli. (iniilllL) 



Frons panlo convexa, antice rotund atim - l, marline prominolo: mandibu 



subemarginat;i.': palpi articnlo ultimo triangulari, oblique truncato, icuto: antennae parum 

 articulo primo elonga: - tibus angustioribus, I coniunctis longioribus : prosternum 



lobatum, maci tice non inflcxo, sutura laterali recta, antice haud, vel vix excavata : i 



sternum non protuberans: cozse posticas laminis intu.-* su!>it'> i dilatatis, deiitf in' 



rotundato: tarsi pubesccntes, articulo 1"'" sequcntibus duobus sequali, 1' ' Bubtua Bffipe lobato, in ' 

 autcm simplici: 5 10 longiore, nnguiculia integ 



In tin- genus I include several species, placed by Germar in ln~ second division of 

 Cryptohypnus, with which they have rerj little relation; they accord nearly with Elater, 

 and seem to differ only in having the fronl less convex and not angulated, the lir-t joint 

 of the antennas elon internal tooth of the posterior cox» rounded. [ wa 



firsl inclined to ( the sp icies like El. dors ilia, in which the tarsi are not lobed, u a 



distinct genus; but finding no other difference, and seeing, moreover, that in the 

 with lobed tarsi, there is no c in the form of the prolongation, il app tra more 



natural to consider them as forming one natural genus, in which, aa in many oth 

 of this tribe, the form of the fourth joint of the tarsi is ?ari ible: the p taterior angli 

 the thorax are carinate, produced and -harp: basal fissures none. 



Our species may be grouped as follows: — 



A. Tarsi articulo I ' lobai ■ Sp. 1 



B. Tarsi articulo t 



C Tarsi articulo I" non lobato, (frons i r;) • ' M 



