222 ACADEMY OF NATURAL SCIENCES 



suture ; a small black dot on each elytron at tip ; stris none : 

 punctures numerous, obsolete; postpectus black: knees, tibia 

 and tarsi black. 



Length one-fourtb of an inch. 



Observed near tbe mountains on the bank of the Arkansa 

 river. 



[Belongs to Dlahrotica. — Leg.] 



6. Gr. EXTERNA. — Blackish-brown, conflueutly punctured : 

 margin of the elytra yellowish. 



Inhabits Arkansa. 



Body blackish-brown, with dense, dilated, confluent punc- 

 tures : head with a longitudinal, indented line : thorax some- 

 what inequal, with a longitudinal, indented line, and lateral, 

 irregular ones : scutel rounded at tip : elytra confluently punc- 

 tured, with three or four elevated, impunctured lines ; lateral 

 margin and tip slightly dilated, yellow : beneath black. 



Length more than seven-twentieths of an inch. 



It is much more robust than G. haccharidis. 



[This is a species of Adimonia. — Leg.] 



7. Gr. PUNGTicoLLis. — Dull ycllowish-brown ; thorax conflu- 

 ently punctured, unequal ; antennae and two fillets on each elytron 

 black. 



Inhabits Mississippi and Arkansa. 



Body with minute hairs : head, above confluently punctured : 

 clypeus and labrum glabrous : antennae black : thorax rough, 

 with excavated, confluent punctures ; immaculate, inequal : 

 elytra with minute punctures; fillets obsolete, often wanting 

 [459] or hardly visible: thighs with a black spot: tibia and 

 tarsi black. 



Length three-twentieths of and inch. 



Captured by Mr. T. Xuttall on the Mississippi. I also found 

 specimens on the Arkansa near the Mountains. It considerably 

 resembles G. haccharidis Fab., but, besides its different mark- 

 ings, its thorax is very much punctured. 



[Appears to be allied to G. notata and G. notulata Fabr. : 

 I have not yet fully identified it. — Lec] 



8. G. ATTENUATA. — Ycllowish-brown; thorax with three black 



[Vol. III. 



