ALURNUS. 29 



A. oblong-elongate, moderately convex above, shining black. Head 

 on the front irregularly excavated, closely punctured. Antennae 

 half the length of the body. Thorax transverse ; sides slightly 

 rounded, sinuate behind, suddenly narrowed and deeply notched 

 at the anterior angles, the latter sUghtly produced, subacute, 

 posterior angles armed with an obtuse tooth ; above convex, 

 thickened and subcylindi-ical in front, broadlj^ depressed behind 

 from side to side, and irregularly excavated ; central line "svith 

 a longitudinal groove, abbreviated in front ; surface rugose-punc- 

 tate, punctiuing rather less crowded on the thickened portion 

 of the disc, sides of the latter near its middle indistinctly strigose ; 

 rufous, the extreme base and apical margin black. Scutellum 

 twice as long as broad, punctate. Elytra much broader than the 

 thorax; sides parallel, slightly sinuate below the shoulders, narrowly 

 margined ; apex regularly rounded ; above convex, sUghtlj de- 

 pressed wdthin the shoulders and below the scutellum, side margin 

 reflexed ; closely punctvu'ed ; pale j-ellow, a small spot in the middle 

 of each elytron, emarginate on its anterior edge, and a narrow 

 line on the apical margin, black. 



Hah. Peru. 



Collections of W. W. Saunders, Esq., and J. S. Baly. 



Mr. Saunders's specimen has rather shorter antennae than mine. 



11. Alurnus bipunctatus (01iv.)= B.M. 



Hispa bipimctata, Oliv. Eiitom. vi. 760. 



Alurnus bipunctatus, Gucr. Rev. Zool. 1840, p. 332. 



apicalis, Guer. Ecv. Zool. 1840, p. 332. 



Cupido, Tliompson, Rev. et Mag. Zool. 1856, p. 117. pi. 6. f. 5. 



A. niger ; elytris flavis, puncto centrali margineque apicali nigris ; 



abdomine saepe flavo. 

 Long. 9-11 lin. 



Var. A. Elytrorum punctis obsoletis. 



Yar. B. Elytris totis immaculatis. 



Oliv, Uiitom. vi. pi. 1. fig. 2, 



Hab. BoHvia ; Cayenne ; Amazons. 



British Museum, "and most of the metropoHtan collections. 



The various forms of this insect have been described by authors 

 under different names. A. hipunctatus, Guer., differs from that of 

 Olivier in having the abdomen yellow, not black, as mentioned in 

 the description of the latter writer. I have placed A. Cupido, 

 Thompson, imder this species : I do not see anytliing to separate it, 

 beyond the broader black line on the apical border of the elytra ; 

 it is in all probability a mere local vai'iety. Mr. Bates, in a letter, 

 mentions that he found this form by the margin of rivulets in the 



