of Petalocerous Insects. 147 



or excavation between the eyes, to be found in none of them. Its 

 thorax is considerably longer than wide, approaching to a hex- 

 agonal shape, and eniarginate posteriorly; while in the other 

 Rutelidce it is wider than long, trapezoid,* and in the majority 

 not emarginafe posteriorly. In Mucraspis, however, Chasmodia, 

 and a new genus, as yet undescribed, sent to me by the Rev. L. 

 Guilding, the prothorax has a posterior obtuse sinus. These 

 genera are all tending towards Cnemida, and even Popillia in 

 some respects seems related to it. Again, in the genus we are 

 considering, the scutellum represents an insosceles triangle, as it 

 does likewise in the genera just named, but in the majority it 

 is equilateral. All the tibiae also are as large and sometimes 

 larger than the thighs, whereas in the other Rutelidce^ even in 

 Chri/sochlora, where they are largest, the tibiae are smaller than 

 the thighs. The claws also, and the podex, are different, and 

 the intervention of the scapulars between the prothorax and 

 elytra, a character Cnemida exhibits in common with Cetonia F. 

 is found in no olher genus of the family as yet known. This 

 genus appears to lead on one side of the circle from the Rutelidce 

 to the Melitophili Latr. 



Francilloni. 1. Cn. nigra, nitida ; prothorace utrinque subfoveato 

 acuducto|; lateribus piceis ; elytris fascia pallida maculas 

 duas nigras includente. 



Plate V. Fig. I. 

 Long. Corp. Liu. 4. 

 Habitat in Georgia America; Stptentrionalisr Ex Mus. D. 

 Francillon. 



Descr. Co7'pus Innceolato-ovatum, glabriusculum, nitidum. 

 C«;jM< triangularo, acuducium : vertice punctato, fronte foveato. 

 Antenna' piceie : scapo pulpisque lufescentibus. Prothorax antice 

 segmento circuli dempto : lateribus in unguium obtusum medio 

 prominentibus, dilute piceis; confertim transverse acuductis pra?- 

 cipue antice, disco subpunctato. Fovea? duae baud profunda^ pro- 

 jhoracem signant. Scutellum basi et utrinque punctatum. E/i/tra 

 lacunosa t, substriata, striis rugulosis, nigra: fascia lat^, subobli- 



• Introd. to Ent. iv. 264 n.27. f Ibid. 271 n. 21. + Ibid. 270. n. 16. 

 B.2 



