;U8 t^" t' new Oeniis of Lamellicorn Beetles. 



faunas iiulicate that they have not always been separated 

 as completely as they now are. The representatives of the 

 group in Australia and South America respectively are very 

 closely related, and the new form here described is the most 

 isolated yet known. AVhile differing little from Phcctiognatha 

 and Adopxis'xw the essential features of the group (the peculiar 

 development of the mandibles and labruni, the reduction of 

 the maxillae and labium and of the number of joints in the 

 antenna), in other characters common to all the liitherto- 

 known sj)ecies (the greatly reduced abdomen, long meta- 

 sternum, and consequent far-back position of the liind legs, 

 and the extreme slenderness of the tarsi) it differs entirely. 

 It is also peculiar in tlie great size of the club of the antenna, 

 a feature, of course, distinctive of the males, and also in a 

 ■<i\\\ more interesting particular, in all probability peculiar 

 also to that sex, viz., the cleft inner claw of the front foot. 

 The absence of the female is another significant point of 

 agreement with Plwnognatha and Aclopics, of which only a 

 single female specimen has yet been recorded, although the 

 species appear to be fairly numerous. Probably in all the 

 genera tlie females are sluggish and of quite different habits 

 to the males. 



Xenaclopus, gen. nov. 



Corpus latum, ubique erecte ciliatum. Caput breve, oculis desuper 

 vieis parvis, lateralitcr baud prominentibus. Clypeus brevissimus, 

 antico late arcuatus. Labrum valde porrectum, corneum, fere 

 eemicirculare. Mandibulae detecta), fere semicirculares, hand 

 acuminatiE aut deiitata^, supra concava?. Maxilla) multo reducta^, 

 mutica), palpis lougis, 4-articulati8. Mentum solidum, acuraina- 

 tuni, palpis termiualibus, longis. Omnium palporum articulua 

 ultimus longissimus. Antenna? 9-articulatfe, clava triphylla. 

 Pedes validi. Coxae grandes contigua), antics latissimte, intus 

 prominentes. Femora 4 posteriora lata. Tibia antica fortiter 

 o-dentata, posteriores extus transversim cariuatae et spincsae. 

 Tarsi longitudine ad tibias fere sequales. Abdomen subtus 

 G-articulatum, paulo contractum. 

 J , anteiinarum articuli 3 nltimi grandes, longitudine ad stipitem 

 sequales, basi angusti, deiude valde dilatati ; pedum anticorum 

 unguis internus profunde fissus. 



Xenaclopus horneensi's, sp. n. 



Parvus, breviter oblongus, castaneus, nitidus, capite, scutello, 

 elytrorum sutura *et marginibus externis abdomineque nigris ; 

 corpore toto cum pedibus longe sed sparsira erecte ciliato ; capite 

 laxe rugoso, pronoto et elytris grosse oequaliter baud crebre 

 puuctatis, puncti? piliferis : pronoto Icviter convexo, latcribus 



