236 REVISION OF THE AMYCTERIDES, iii., 



iicctcd, and leaving a brnsli oi' hair on tlie inner border. In this 

 respect, Macranu/clcra.s approaeiies closeh* to Sclerorrliinus, these 

 structures being of a simihir character in that genus. 



Relation to Other Genera. — The species comprising- this, numeri- 

 cally small group arc, with one exception, remarkably homogene- 

 ous in appearance and structure. The exception, M. Boisduvali, 

 nngiit Avell be separated generically ; it is, however, more closely 

 related to the other species of Macramijcterus tlian to any other 

 genus. In the structure of the prothorax and in the arrangement 

 of tlie elytral tubercles, these species show a resemblance to Acan- 

 tholopliiis. I cannot, however, regard this resemblance as more 

 than superficial, nor as showing a connecting link between Amii- 

 tliolopliKu and the TalauriiiKs-Sclerorrliijius Section. The jn-esence 

 of the internal, rostral ridges would point to a relationship with 

 Talauri)ii(s, while the structure of the sexual organs suggests 

 aflinity with Sderorrliiuus. I tliink it probable that Macrami/c- 

 tcriia has developed from a common ancestor of Talaurinus and 

 iSderorrliinus, and has become separated early in the line of 

 descent. The small number of its species, and their lai'ge size, per- 

 haps indicate that the genus Marram ycteruii represents a dying 

 race, in the natural order of things to become extinct at no distant 

 date. 



Geo(jrap}iical l)islributio}i. — Althougli a fair iuuuf)er of speci- 

 mens \v^\Q passed through ni}' hands, the data, as regards place of 

 capture, have been meagre. All the species occur in West Aus- 

 tralia. M. Leichhardti was recorded from the Lynd Kiver, NortJi 

 Australia; it appears to occur elsewhere in West Australia. 21. 

 Boisduvali and J/, draco were described from King George's 

 Sound, while M. Schihiherri occurs on the Swan River. Mr. Lea 

 has recorded M. draco from Mullewa, though most of the speci- 

 mens I have seen of the variety I have called insiynis, Avere taken 

 either at Keller))errin or Conjerdin. The male type of J/, ohsole- 

 ins is from Yilgarn, but the specimens I regard as probably 

 females of the same species, came from Nangeran. J/, tibialis is 

 from Shark's Bay. 



