INSECTA MADERENSIA. 443 



puuctate-striated elytra, Avill ^^QYxe prima facie to distinguish it. The Madeii'an 

 sj)ccimcus are a trifle larger and less deeply sculptured than the ordinary 

 northern type. 



Genus 147. LONGITARSUS. (Tab. IX. fig. 4 et 6.) 



Latreille, Fam. Nat. des Ins. 405 (script. Longitarse) (1825). 



Corpus ijarvum, plus minusve elongato-ovatum, pone medium plerumque subinflatum convexum : 

 capite triangulari : prothorace angusto parvo subcylindrico, ad angulos (prjesertim posticos) plus 

 minusve rotundato : elytris punctatis : alls modo amplis, modo (ut in speciebus Maderensibus 

 certe indigenis) obsoletis. Antenna fiUformes elongatse, articulo primo robusto longiusculo, 

 secundo brevi, reliquis subsequalibus (ultimo elongato-ovato apice oblique truucato). hahi'um 

 amplum transverso-subquadratum, coriaceum limbo membranaceo, apice integrum. Man- 

 dibulce elongatfe, basi tenues latfe, apice cornese acutse fortiter incurvo-dentatse, margine 

 interno membransl angustissima aucto. Maxilla, palpi, mentum et ligula fere ut in Haltica, sed 

 palpi labiales paulo longiores, articulo secundo minus inflato. Pedes (prtesertim postici saltatorii) 

 elongati : femoribus posticis incrassatis : tibiis anterioribus muticis ; posticis spina apicali interna 

 armatisj et apicem versus externum seriatim spinulosis : tarsis articulo primo subparallelo (in 

 anterioribus lato elongato, in posticis angustiore longissimo), secundo et tertio in anterioribus 

 longitudine \dx suba^qualibus, secundo in posticis tertium longitudine superante. 



LongitarsKS {=Thyamis, Stephens, a.d. 1831), as already stated, differs from 

 Haltica jjwjier mainly in external characters, — wliich however are sufiiciently 

 apparent to he at once easily detected. Thus, the comparatively elongate-ovate 

 form of the species composing it (which nearly always have a tendency to be more 

 or less expanded, or inflated, beyond the middle), their more triangular head, 

 narrower, more cylindrical and somewhat posteriorly -rounded prothorax, their less 

 abbreviated antennae and legs, the last of which have the apex of the fom* anterior 

 tibiae entu'cly unarmed, wldlst the spiu* on the hinder (externally spiuulose) pair is 

 larger than in Haltica, in conjunction with the longer and more parallel basal 

 joint of their feet, constitute the priacipal poiats on which its separation from that 

 genus is made to rest. All the Longitarsi, moreover, are simply punctulated 

 insects; Avhereas the Halticce are composed not only of punctiu'ed, but also of 

 ininctate-striated ones, — perhaps of about an equal number of each. As regards 

 theii' oral organs, the mandibles of Longitarsus are a little longer and less corneous 

 than those of Haltica ; and the labial palpi are not quite so short. In their habits, 

 the members of these genera are precisely similar, — being attached (almost exclu- 

 sively) to the foliage of the smaller plants, on which they frequently abound. 



§ I. Alee obsoletce : antenna longissimte. 



337. Longitarsits Isoplexidis, WoJl. (Tab. IX. fig. 4.) 



Ij. oblongo-ovatus depressiusculus subopacus testaceus, capite, elytrorum sutura, maculis duabus (una 



3 L 2 



