1880.] 59 



AcANTHODERES THAMMI. 

 A. rubripedi (Bates) simillimus, at differt antennarum articulis Z t0 et 4 t0 line- 

 aribus-compressis, apice nullo modo dilatatis. Castaneofuscus, Icete croceo-maculatus, 

 pedibus antennisque rubris,femoribus tibiisque basi et apice nigris, tarsis aureo-fulvis, 

 articulo basali obscuriori : maculis croceis ita dispositis : — apudfrontem, genas et 

 occipitem utrinque macula una; ad thoracis latera utrinque maculae magnce dua, et 

 {medio dorso) duce minores : ad elytras utrinque circa decern, quarum quinque majores : 

 elytris apice rede truncatis, angulis exterioribus vix productis : corpore subtus 

 lateribus croceo-maculato. Long. 7 — 8£ lin., $ ? . 



Chanchamayo, Peru (Thamm). 



This handsome species of the Swederi group is distinguished from 

 rufescent varieties of A. Swederi by the second joint of the tarsi being 

 always golden-tawny like the 3rd and 4th. It is, besides, a larger and 

 more robust insect, with shorter and stouter legs, and the spots are 

 larger and of a richer deeper yellow than in Swederi : the two discoidal 

 spots of the thorax are always present, in other respects the number 

 and position of the spots both above and beneath are very similar in 

 the two species. 



ACANTHODERES ZCXNATUS. 

 A. Swederi affinis : castaneo-rufus, tenuissime atireo-tomentosus, elytris fascia 

 recta paulo ante medium guttisque nonnullis basin versus et post medium, pallide 

 flavis : antennis articulis 3 — 6 apice, 7 — 11 totis, atro-fuscis, 3 — 4 apice leviter in- 

 crassatis, 8 — 11 abbreviatis : tibiis anticis apicem versus (pracipue extus) conspicue 

 dilatatis : pedibus rubris, genubus tibiisque apice atro-fuscis, tarsis melleo-fulvis : 

 corpore subtus atrofusco, griseo-pubescenti, lateribus (fere ut in A. Swederi) flavo- 

 maculato. Long. 7 lin., $ . 



Cauca Yalley, near Granada. 



In the dilated apices of the 3rd and 4th antennal joints, and the 

 diminished length of joints 8 — 11, and in the expanded apices of 

 the fore tibiae in the $ , this well marked species agrees with A. rubripes 

 and brevicollis, of Nicaragua, and differs from A. Swederi. The ex- 

 ceedingly close resemblance of these species, notwithstanding the 

 abrupt structural modifications, is well worthy of note. 



ACANTHODERES SUBTESSELLATUS. 

 A. Swederi paullo longior : niger, subopacus, thorace lateribus elytrisque plagi- 

 atim albis ; partibus albis nigro-punctatis et laciniatis apud elytras fascias duas 

 adumbrantibus, viz., altera obliqua ab humeris ducta, altera apicem versus : capite 

 maculis sex {ut in A. Swederi sitis) albis : thorace fere impunctato : elytris basin 

 versus sparsim aspere punctatis, apice transversim flexuoso-truncatis ; angulis exter- 

 ioribus paullo productis : corpore subtus nigro, albo-maculato ; tibiis medio albis, 

 tarsis articulis 3 — 4 aureo-fulvis : antennis ut in A. Swederi articulis 3 — 4 usque ad 

 apicem linearibus, sed differt articulo ll»to ( $ ) precedenti breviori. 



Long. 5 — 6i lin., $ . 

 Ecuador (Buckley). 



Another very distinct species of the Swederi group. 



