164 DESCRIPTIONS OF NEW SPECIES. 



slightly thickened externally. . The generic characters are suffi- 

 ciently detailed in the work cited above. I observe no sexual 

 differences, except tha't the antennae of the male are more than 

 half the length of the body, and the distance between the eyes is 

 not greater than their diameter ; while in the female the antennae 

 are shorter and the eyes more distant.* 



X AXTIIOCimOA SCHMIDT. 



4?'2. X triiiotata. Valde elongata, fusca, breviter pubescens, 

 capite nitido rnodice punctate, flavo-testaceo, vitta longitudinal!, labro, 

 palpis maxillaribus, mandibularum apiee, palporum labialium artieulo 

 ultimo antennisque nigris ; thorace campanulato, latitudine longiore, 

 lateribus sinuatis, antice rotundatis, disco nitido modice punctate, antice 

 postice et utrinque versus latera impresso, flavo-testaceo, lateribus 

 vittaque dorsali lata nigris ; elytris dense punctatis, lineis utrinque 

 duabus elevatis versus apicem obliteratis, tertia externa obsoleta, quar- 

 taque submarginali distincta, limbo suturali marginalique testaceo ; 

 subtus fnsca, propectore, coxis anticis et mediis, femorum tibiarumque 

 basi testaceis. Long. *50. 



One specimen, Louisiana ; Mr. TJlke. Easily distinguished 

 from X. lateralis by the larger size, the less finely punctured 

 thorax, which is marked with a broad black dorsal vitta. 



COPIDITA LEO. 



Corpus elongatum gracile. Caput latitudine longius, antice sensim 

 angustatum ; oculi subtiliter granulati, modice transversi, late distantes, 

 antice vix sinuati ; antennae filiformes, utriusque sexus 11-articulatse, 

 articulo 2ndo brevi, 3io sequent! aequali, llmo (maris) superne siuuato, 



* The analytical table of genera of Oedemeridse, on p. 258 of Class. Coll. 

 N. America, is quite defective ; the following may be substituted as show- 

 ing the relations of the genera after Microtonus : 



Antennae not embraced by the eyes ; middle coxae contiguous ; 

 Body stout ; tarsi with the joints 4, 3, 2, spongy beneath. Dmxtrs. 

 Body slender ; 



Anterior tibiae with one terminal spur ; 



Eyes feebly emarginate. NACEKDES. 



Eyes deeply emarginate. XANTHOCHROA. 



Anterior tibiae with two terminal spurs ; 

 Ungues simple or obsoletely toothed ; 



Mandibles bifid at tip. COPIDITA. 



Mandibles acute at tip. OXACIS. 



Ungues strongly toothed at base ; 



Mandibles acute at tip. PROBOSCA. 



Mandibles bifid at tip. ASCLERA. 



