1!)1S.] F. H. (Ihavkly : I'ltasulidtir nj fhc Wmlil. 77 



\vli('n<'V(>i' asviiinit'tiv occurs in the iii:milililcs. tlic dentition is reduced chiefly on the ri^ht 



side. 



The distin<tive i liiiracters ot tlie Hrst foiii- of tliese f^enera do not appear to nie to liave 



more tlian sjiecilic sifjniticance. and 1 propose to unite them under the name Pelnpides. 



The fifth genus. I'lcstlinni.s. seems to I»e distinct. It is possil)le (see helow, p. 121) that 



these genera niav have heen derived from Tiben'oides, but as thi.s i.s by no mean.s 



certain I have not placed Tiherloidcx beside tliem. Iiiit have left it next to the symmetrical 



species of Epispliemis. 



PhaiocliilKS. Episphenoldes. Mdi^torhihis, Analar/ies and Ceteju.s may likewise be uniteil, 

 the scars on the mentum, with the aid of which they have hitherto been defined, being 

 variable and not sharply distinctive. The somewhat large genus resulting from this union 

 is. however, composed of four more or less distinct groups of species, for which four of 

 the above names may be retained in a subgeneric capacity. Thus P/ui melt i 'tis may be 

 defined so as to include only large Australian .species with extremely short antennal 

 lamellae and more or less extensive matt lateral borders to the mentum. And Episplieiwides 

 may advantageouslv, 1 think, be re-united with the very few known species of MaslorliHiis, 

 and may then be defined so as to include the remaining large symmetrical species. 

 Amilachea and Celejiis are very difficult to separate from Mastochihi^s on structural 

 grounds, but contain species of ;i niiiili smaller size, many of which are distinctly 

 a.symmetrical. Aiiahches contains somewhat larger and flatter species than Ce'ejii^ 

 with distinctly longer antennal lamellae. According to Heller, who has examined Zangs 

 material (1910, pp. 14 and 21). the upper edge of the left mandible is toothed near the ba.se, 

 and this is in agreement with my observations on the few species before me. This tooth 

 is sometimes, however, situated so near to the base as to be hidden beneath the anterior 

 angles of the head. This is so, for instance, in Stoliczka's australiensis. which Heller 

 places in the genus Cetejus, in spite of its flattened form and long antennal lamellae, but 

 which dissection shows to be an Analaclies. 



Mastochiliis (s. kit.) appears to represent the simpler stock from which the remaining 

 genera, all more highly specialized, have been derived. All these other genera are found 

 mainly in the islands east of Celebes, and whenever their dentition is reduced this occurs 

 most markedly on the left side, instead of on the right as in Oriental groups (see pi. I). 



Kaupioloides, Hyperplesthenus, AureliHS. Lahienus and /vfl»/)/o/»-s all have symmetrical 

 mandibles with complete dentition. In the most highlv specialized species the elytra are 

 united, and in all of theiu the intermediate and lateral areas of the metastermim are fused, 

 a fusion wliich is clo.sely associated with the union of the elytra, tending to follow it in the 

 other groups of Pa.ssalidae in which it occurs. Probably, therefore, these genera are losing, 

 if they have not already lost, the power (or at least the habit), of flight, the wings doubtless 

 becoming more efficient stridulatory structures at the same time. None of these genera 

 are very large, and they may advantageously be united under the name Lahienus. 



and in Knup's originni dpscription of qundrironii* [tor. cit.) the only locality referred to is that of the type of lollinii, 

 11 locality which he ha.s quoted in his monograph, perhaps inadvertently, as that of qimdrieornis. Even if the typo of 

 qiiadriroriii.i should prove, on re-c.\amination, to be lalicllc<l " New Holland " 1 shmdd still doubt the validity of the 

 record, in view of the extreme improbability of any such highly .•iiK'cialized spi'cies. with Oriental nithcr than I'apuan 

 affinities, occurring there. 



