AMERICAN COLEOPTERA. 245 



PTEROLiOMA Gvll. 

 Head oval, gradiialh' but feebly narrowed behind the eyes which are round 

 and moderately prominent. Labrum transverse, emarginate. Maxillary palpi 

 moderately long, rather slender, first joint very siiort, the next three nearly 

 equal, the second being slightly conical, the fourth acute at tip. Anteunse 

 slender, as long as half the body, base free, very little thickened toward the 

 til), first joint rather short, stouter than the following, second a little shorter 

 than the first, third longer, joints 3—10 very gradually decreasing in length, 

 eleventh a little longer than the tenth, oval and acute at tip. Anterior coxal 

 cavities partly closed behind by a slender prolongation of the epiniera. Middle 

 coxse oval, not prominent, narrowly separated, posterior coxa contiguous. Legs 

 slender and long, tibise slender not or extremely feebly spin ulose externally. 

 Tarsi slender. Elytra margined, epipleurae moderately wide. Form elongate 

 with Carabide faeies. 



This genus is remarkable ia the present tribe in the absence of 

 tibial spinules and the slender elongate autennse. Two species occur 

 in our fauna both having considerable resemblance to Carabidne so 

 that the genus had been placed in that family, F. Forsstrcemii re- 

 sembling a Nebria while tenuicorne recalls Calathus. 



The two species are as follows : 



Thorax cordiform, base narrowed Forsstrcemii Gyll. 



Thorax transverse, base not narrowed, gradually narrowed in front. 



tenulcorue Lee. 



P. Forsstrcemii Gyll.— Moderately elongate, piceous, elytra, antennae 

 and legs paler, surface moderately shining, glabrous. Head coarsely irregu- 

 larly punctured, a vague vertical fovea. Thorax cordate, one-half wider than 

 long, sides arcuate in front, sinuate posteriorly, margin acute, slightly reflexed, 

 apex emarginate, apical angles obtuse, basal angles rectangular, base truncate 

 a little wider than the length of the thorax, an intra-angular impression, sur- 

 face coarsely but irregularly punctured, median line moderately impressed 

 foveate posteriorly. Elytra wider than the thorax, oval, narrower posteriorly, 

 humeral angles obtuse, disc moderately convex, surface deeply striate, striae 

 coarsely punctured, intervals convex, the third and fifth with distant coarse 

 punctures. Epipleurse very coarsely punctured. Body beneath sparsely and 

 indistinctly punctured. Length .24 inch; 6 mm. 



The males have the anterior tarsi feebly dilated, and the first two 

 joints of the middle a little stouter than in the female, in the latter 

 sex the sixth ventral segment is deeply longitudinally impressed. 



The resemblance of this insect to a small Nebria or to a Loricera is 

 remarkable, and the deep punctures of the alternate intervals of the 

 elytra are repeated here. 



Occurs from the north of Europe through Asia to Alaska. 



P. tenuicorne Lee. {NecrophUus). —Ohlong-ovaA, piceous or castaneous, 

 feebly shining, glabrous. Head nearly smooth. Thorax one and a half times 

 as wide as long, widest at the middle, sides feebly arcuate, apex emarginate, 

 a little narrower than the base, apical angles obtuse, base truncate, hind angles 



