OP PHILADELPHIA. 93 



[This is the same as F. moesta Say, Trans. Am. Phil. Soc. 

 2, 42.— Lec] 



2. F. HEROS. — Apterous, black ; mandible striated ; thorax 

 contracted abruptly at base, posterior angles acute; elytral striae 

 slightly impressed, punctured. 



Length rather more than nine-tenths of an inch. 



Body black and glabrous : mandibles much and deeply striated : 

 thorax large, convex, rather abruptly contracted at the basal 

 margin ; dorsal and anterior and basal lines distinct, basal mar- 

 gin depressed, near the angles rugose ; an elevated line on the 

 basal margin near to, and parallel with, the lateral edge ; basal 

 angles rectangular : elytra very slightly striated ; stria? acute, 

 punctured, punctures obsolete towards the tip; interstitial lines 

 flat : beneath black. 



Brought from the Arkansa by Mr. Thomas Nuttall. It is the 

 largest native species I have seen of this genus, and is probably 

 referable to the genus Pterostichus of Bonelli. 



[Belongs to Evarthrus Lec. — Leg. [146] 



3. F. MACULIFRONS. — Black ; thorax narrower than the elytra; 

 vertex with two obsolete piceous spots ; elytra with acute im- 

 punctured stria?. 



Length more than two-fifths of an inch. 



Body black, glabrous : vertex with two obsolete piceous spots, 

 placed near the eyes, and very distinct in a particular exposure 

 to the light : antennte piceous, the joints paler at their bases, to- 

 wards the tip with light brownish hair : palpi, tip of the mandi- 

 bles and of the labrum piceous, the former tipped with pale yel- 

 lowish : thorax narrower than the elytra, longitudinally suborbi- 

 cular ; lateral edge a little recurved, particularly at the hind 

 angles, which are not excurved, but obtusely rounded; dorsal 

 line and anterior transverse line impressed, basal lines almost 

 obsolete in the concavity of the lateral base, which is not rugose : 

 elytra with a very slight cupreous reflection ; striae acute, im- 

 punctured, interstitial lines flat : all beneath piceous. 



This insect was found in the Arkansa Territory by Mr. Thomas 

 Nuttall. It is so closely allied to the species which I have named 

 plarAda, as not to be, at first sight, distinguished from it ; never- 

 theless, on comparing it with that species, it will be discovered 

 1823.] 



