308 COLEOPTERA OF NORTH AMERICA. 



as the palpi. Antennae slender, with the 4th joint shorter than 

 the 3d and 5th, as long as the body in , shorter in 9 , punctu- 

 late and sericeous, without poriferous system. Front coxal cavi- 

 ties small, not angulated, widely open behind ; mesosternum 

 somewhat obtusely pointed in front, and feebly concave each side, 

 to complete the front coxal cavities, general surface flat, broad 

 between the coxse, and emarginate behind, coxal cavities small, 

 closed. Abdomen with the 1st ventral segment longer. Legs 

 very long and slender, thighs suddenly and strongly clubbed at 

 the tip, hind tarsi with the 1st joint twice as long as the 2d. 

 The elytra are flat especially at the base, and suddenly declivous 

 so that the basal edge is unusually distinct; the scutellum is 

 small, but obtuse, the stridulating surface is large and undivided. 

 This group has been considered as allied to Callichroma, but 

 seems to me better placed as an ally of Stenopterus, etc., lead- 

 ing to Necydalis, and thence to Leptura. 



Tribe VI. AWCYLOCERIffl. 



Body slender, cylindrical, coarsely punctured ; head short, front 

 small, perpendicular, gense large; eyes finely granulated, deeply 

 emarginated, vertex concave; mandibles acute, palpi short, nearly 

 equal, not dilated; mentum very transverse, excavated, as in most 

 Cerambycidse. Antennae serrate, half as long as the body in 9 , 

 longer than the body in $, very sparsely punctured, sensitive 

 system commencing on the 3d joint, forming two well-defined 

 spaces on the under surface, separated by the sharp edge of the 

 joint, llth joint oval, pointed at tip in ?, very short and curved 

 in $. 



Front coxal cavities small, open behind ; middle coxal cavities 

 nearly closed by the sterna ; mesosternum deeply emarginate 

 behind. Legs slender, thighs suddenly and strongly clubbed, 

 hind pair armed with a terminal spine on the inner side ; 1st 

 joint of hind tarsi scarcely one-half longer than the 2d. Ventral 

 segments nearly equal in length except the 1st, which is longer. 



A very peculiar tribe, recalling Ibidion by its slender, cylin- 

 drical form, but not related to it nor to any other known to me. 



But one species Ancylocera rugicolUs, black with scarlet 

 elytra and abdomen, is found in our Southern States from North 

 Carolina to Texas. 



