DESCRIPTIONS OP NEW SPECIES. 215 



brown ; the dark portions tend to become confluent longitudinally 

 between the side margin and the suture. 



I have included under this name several forms which will be 

 eventually placed as distinct species, but which I am unable at 

 present to properly defiue, in consequence of want of sufficient 

 material. They are follows : 



a. Antennae of both sexes more slender than in the other forms, with 

 moderately large sensitive spaces. Last ventral segment, in four 

 specimens before me, subtruucate and slightly declivous at tip, anal 

 plate simple, pygidium feebly emarginate ; abdomen yellow in three 

 specimens from the Middle States, dark in one specimen from Kansas ; 

 elytra yellow, with spots moderate in size, longitudinally confluent. 



. Antennae rather heavier than in , longer in ^ , with moderately large 

 sensitive spaces, shorter in 9> with much smaller spaces. Last 

 ventral segment of deeply excavated for nearly half its length ; 

 anal plate excavated and hairy, of 9 subtruncate and feebly im- 

 pressed, pygidium subtruncate in $ , emarginate in 9 . Elytra in 

 two specimens ( 9 ) marked like the preceding, iu three $ dark with 

 narrow remnants of the yellow bands. Kansas. 



y. Antennae as in 8, longer in with small sensitive spaces. Last ven- 

 tral, segment anal plate and pygidium of , as in[5 ; in 9 with a trans- 

 verse carina or plate near the tip ; pygidium not emarginate ; elytra 

 castaueous, with faint traces of yellow spots, Indian Territory, Dr. 

 Horn. 



J. Antennae as in 8 and y, last ventral segment 9 mfa a small elevated 

 tubercle near the tip, pygidium not emarginate. Elytra with large 

 spots, more or less confluent. Two 9 ', Kansas. 



s. Antennae , as in the preceding, but ferruginous, as are the legs and 

 abdomen ; last ventral feebly impressed as in 9 of 3, and pygidinm 

 very feebly emarginate. Elytra bright-yellow, with the spots clearly 

 defined, the 1st and 3d forming bands. One specimen, Texas. (The 

 pubescence seems shorter than in the other forms, but has been in 

 great part abraded.)' 



L.EPTURA LINN. 



The species of this genus are very numerous, especially in the 

 northern and northwestern parts of the continent, and may be 

 conveniently arranged as follows : 



A. Prothorax more or less triangular, or campanulate, widest at the base, 



hind angles prolonged ; STENURA Serv. 



a. Prothorax strongly narrowed from the base, which is broadly but 

 deeply bisinuate, posterior transverse impression distinct ; 

 elytra widest at the base, gradually narrowed behind, 

 truncate and emarginate at tip, which is not margined ; 



