CARABIDAE. 1 5 



thighs deeply excavated beneath ; the anterior tibiae are but slightly 

 emarginate internally ; the upper spur is a single bristle. 



In all the genera of this tribe the margin of the elytra at the 

 point where the posterior curvature commences is interrupted by 

 an oblique ridge marked with a furrow, at which the epipleura 

 suddenly ceases. Dorsal striae are wanting; the submarginal ocel- 

 late punctures are few, and not distinct. The suture between the 

 epiraera and episterna of the prothorax is not distinct. The side 

 pieces of the mesosternum are diagonally divided, and the epimera 

 reach the coxae; the side pieces of the metathorax are long and 

 very narrow, with the epimera larger than usual. 



The species of Ozaena, as noticed by Lacordaire, eject from the 

 extremity of the abdomen, with explosive force, a pungent fluid, in 

 a manner similar to Brachinus. 



Tribe II.— PSEUDOMORPHmi. 



This tribe, of which most of the species are found in Australia, 

 has but a single representative (Pseudomorphus excrucians Kirby; 

 Dreparms Lecontei Dej.) in our country; it is one of the rarest of 

 our Coleoptera, and is found in Georgia and Carolina. 



The genera of this group are among the most anomalous of the 

 family, and at first sight would not be considered as belonging to 

 it. Our species has almost the appearance of Ips; other genera 

 resemble Gyrinus in form. 



The mentum is entirely connate without suture with the gula, a 

 character otherwise found in only one tribe of the first sub-family 

 (Siagonini), foreign to North America. The mesosternum is ex- 

 tremely narrow, as in Ozeenini, so that the middle coxae are in con- 

 tact; the episterna are large, the epimera very small, and do not 

 reach the coxal cavity; the episterna of the metathorax are long, 

 with distinct epimera. 



The sides of the front are dilated, and the antenna? are inserted 

 beneath the dilatation; three basal joints are smooth in our species ; 

 the mentum is deeply emarginate, without gular suture. 



The legs are somewhat compressed, the femora are deeply exca- 

 vated beneath; the anterior tibiae feebly emarginate, with the upper 

 spur remote from the apex. 



The anterior coxae are very narrowly enclosed behind, and the 

 prosternum is somewhat prolonged ; the sutures between the pro- 



