CARABIDAE. 19 



formerly established by me under the preoccupied name Eugnathus, 

 but afterwards* changed. 



Tribe III.— MORIOXIjVI. 



The ligula in this tribe is dilated, and without paraglossae; the 

 antennas are rnoniliform: the four basal joints are glabrous, and 

 even the outer joints are less pubescent than usual; the last joint 

 of the palpi is cylindrical, truncate; the elytra are entire, rounded 

 at tip, with the usual series of ocellate punctures, which, however, 

 diverge from the margin behind. The anterior tibiae are com- 

 pressed and dilated, and the tarsi not dilated in the male. The 

 under surface of the head behind the eyes is somewhat sulcate, for 

 the reception of the antennae; the parapleurae of the mesothorax 

 are very short, whereby, as well as by the form of the anterior 

 tibiae and ligula, this tribe is separated from the Psydrini, with 

 which it has been confounded by many authors. 

 . But one genus, Morio, is represented by a single species, M. 

 Georgia, in the Southern States. The head is suddenly and 

 slightly constricted behind. It is commonly found under bark, 

 and is an elongate, shining black insect, with deeply striate elytra. 



Tribe IV.— HELLUOWINI. 



The ligula in this tribe is without paraglossae; the antennae are 

 much compressed and thickened externally, with the three basal 

 joints smoother than the others, and sparsely hairy. The anterior 

 tibiae are compressed and dilated, the anterior tarsi scarcely dilated 

 in the males. The elytra are shorter than the abdomen, broadly 

 rounded and almost truncate at the tip. The head is constricted 

 behind, forming a short neck. 



From Dryptini this tribe is distinguished by the shorter first 

 joint of the antennae, the broad anterior tibiae, and the ligula with- 

 out paraglossae. 



One genus (Helluomorpha) only is represented in the fauna of 

 the Atlantic region by six species; the labrum is large, concealing 

 the mandibles, and the antennae very much compressed. The spe- 

 cies are elongate, hairy, strongly punctured, brown insects, found 

 under stones and bark. 



* Proc. Acad., VII. 220. 



