124 



smaller examples seem of more slender build than the larger ones 

 with the sides of the prothorax a trifle more strongly rounded. 

 It is quite possible that the collection of numerous specimens of 

 each form taken in company might establish their distinctness. 



D. ffracilis, sp. nov. Angustus ; elongatus ; satnitidus; obscure 

 ferrugineus ; capite pronotoque fere ut praecedenUs 

 (D. thoracici) sed hoc magis fortiter nee magis crebre punc- 

 tulato, lateribus minus fortiter marginatis et ante medium 

 magis arcuatis, angalis posticis multo minus late obtusis ; 

 elytris seriatim fortiter punctulatis (serie subsuturali in 

 stria sat raanifesta impressa), interstitiis subtilissime sat 

 perspicue punctulatis omnino (3° prope basin apicemque et 

 5° 7° que totis leviter subcariniformibus exceptis) planis. 

 Long., 3il.; lat., tV 1. (vix). 



This is a very isolated species of DeretapJiriis, — the mos^ 

 decidedly nitid known to me and differing from all others that I 

 have seen in the inner four of the interstices of its elytra (except 

 the third close to the base and near the apex) being absolutely 

 flat, the second, third, and fourth rows of punctures being mere 

 isolated impressions on an even surface. The pronotum is so 

 much like that of the preceding species that it seems unnecessary 

 to repeat the details of its description, and sufficient to say that 

 the description of the pronotum of flio^^acicus describes that of 

 the present species with the qualifications noted above. The two 

 previously known W. Australian species of Deretaphrus (neither 

 of which I have, to my knowledge, seen) are described as having 

 the third interstice keel-like. 



W. Australia. 



D. iridescens, sp. nov. Sat elongatus ; sat angustus : sat nitidus 

 (pr?ecipue in pronoto) ; obscure ferrugineus, pronoto mani- 

 feste cgeruleo-micanti ; capite subtilius sat crebre punctulato ; 

 prothorace quam latiori ut 6 ad 5 longiori, supra sparsim 

 vix subtiliter punctulato, subdepresso, profunde canaliculato 

 (canali basin fere apicem nullomodo attingenti, ante medium 

 interrupto, parte antica perparva), ad quasi-apicem quam ad 

 mediam partem parum angustiori, lateribus a quasi-apice 

 fere ad basin sat aequaliter arcuatis hinc ad basin sinuatis, 

 angulis quasi-anticis (superne visis) late obtusis posticis sat 

 obtusis sed ad apicem summum dentiformibus, carina? later- 

 alis apice a segmenti margine antico late (circiter oculi 

 diametro) distanti, parte basali utrinque transversim im- 

 pressa ; elytris punctulato-striatis (striis suturalibus 2 sub- 

 tiliter, ceteris sat grosse, punctulatis), interstitiis alternis 

 leviter convexis (3° ad basin et apicem, 5° 7° que totis. sub- 

 cariniformibus) alternis sat planis (omnibus vix perspicue 



