148 GEO. H. HORN, M. D. 



The only genus which occurs in our fauna is Casnonia represented 

 by two species pensylvanica and ludoviciana, in which the setigerous 

 punctures of the second stria are very indistinct and rarely more than 

 four in number. The last mentioned species is remarkable in having 

 the thoracic margin rounded and the sutures of the under side entirely 

 obliterated. The only other instance known to me of such a structure 

 is in Apotomus, which Schaum says is distinguished from all other 

 Carabidae in this manner. 



Tribe XXX.— Dryptini. 



Antennae setaceous, free at base, three basal joints somewhat less pubescent, 

 the first usually elongate and thicker than the following. Head constricted at 

 a variable distance behind the eyes to a neck which sometimes expands semi- 

 globularly at its insertion in the thorax, front narrowed before the eyes, two 

 supra-orbital setse, clypeus moderately prolonged and with a variable number 

 of setigerous punctures, sometimes (Drypta) without any. Eyes oval moderately 

 prominent, usually not very close to the mouth beneath. Labrum transverse, 

 moderately prominent, truncate or feebly emarginate, sexsetose in front, the two 

 lateral setse in Drypta stouter, longer and nearly vertical. Mandibles slightly 

 prominent, feebly arcuate, acute at tip. Maxillae hooked at tip, ciliate or spinous 

 within, outer lobe usually slender, biarticulate, with equal lobes, palpi long, more 

 or less hirsute, the terminal joint more or less triangular. Mentum variable in 

 form, deeply emarginate with or without tooth, ligula and paraglossae variable in 

 form, the palpi moderately long, the terminal joint shorter than the preceding, 

 more or less triangular in form, the penultimate longer and plurisetose in front. 

 Thorax variable in form, often moderately long, the lateral margin acute, (except 

 in Drypta) the lateral setae often indistinct, that of the posterior angle usually 

 entirely absent. Scutellum distinct. Elytra not margined at base, lateral margin 

 acute, entire, apex truncate, dorsal punctures absent except in Stenochila. Pro- 

 sternum not prolonged. Mesosternal epimera very narrow. Metasternal epimera 

 distinct, posterior coxae contiguous. Legs moderately long, the femora often slightly 

 clavate, the middle and posterior tibiae ciliate or slightly spinous externally, the 

 anterior slender, deeply emarginate within, the tibial spurs moderate in length, 

 rarely ( Galerita) long. Tarsi variable in form, the claws simple or pectinate. 



The males have the anterior tarsi dilated, sometimes very slightly and densely 

 juibescent beneath. 



The tribe as here constituted is the equivalent of Lacordaire's Galeri- 

 tides, for which later authors have adopted the name which I retain. 



I have already given in the Ctenodactylini the reasons for the change 

 of places of Stenochila and Caloplipemt. Poli/stichua is removed to 

 Ilelluonini for reasons which will hereafter be given. The essential 

 character separating the Dryptini from all other Truncatipennes is found 

 in the structure of the labial palpi. The form of the basal joint of the 

 antennae usually relied on is by no means a good character as several of 

 the preceding tribes have the first joint even longer than some of those 

 of the present. Where the scape attains its typical length it is usually 



