202 



head is well defined, but scarcely divided, the middle lobe a little 

 more than two-thirds of a lateral lobe in size. I have named 

 this species after the late Mr. G. R. Waterhouse, who did 

 valuable work on Australian Melolonthidce. 



Western Australia; Eyre's Sandy Patch. 

 H. macilentus, sp. nov. Modice elongatus, postice vix dila- 

 tatus ; minus nitidus ; obscure fuscus, corpore subtus 

 antennis palpis pedibusque f errugineis : supra pilis brevi- 

 bus adpressis et nonnullis (praesertim in pronoto antice 

 et in elytris postice) elongatis erectis vestitus; clypeo 

 (hoc antice late perleviter emarginato) fronteque crebre 

 sat fortiter rugulosis, fere planum continuum efficient- 

 ibus ; labro clypei planum superanti ; capite antice (a 

 tergo oblique viso) tripliciter convexo (parte mediana 

 quam laterales parum angustiori) ; antennis 9-articulatis ; 

 prothorace quam longiori ut 13 ad 7 latiori, antice modice 

 angustato, supra crebre subtiliter punctulato (puncturis 

 circiter 32 in segmenti longitudine), lateribus (superne 

 visis) leviter arcuatis, angulis anticis sat acutis modice 

 productis posticis (superne visis) rotundo-obtusis, basi vix 

 manifeste bisinuata, margine basali ad latera summa 

 manif este magis elevato ; elytris longitudinaliter sat 

 obsolete striatis, confertim subtilissime punctulatis (trans 

 elytron puncturis circiter 50), in parte apicali summa 

 prope suturam breviter longitudinaliter carinato ; pygidio 

 sat crebre minus fortiter punctulato ; coxis posticis quam 

 metasternum baud brevioribus, quam segmentum ven- 

 trale 2 um multo longioribus ; tarsorum posticorum articulo 

 basali quam 2 US vix breviori quam 3 US multo longiori ; 

 unguiculis posticis appendiculatis, parte basali quam 

 apicalis multo longiori. Long., 3 1.; lat., If 1. 

 I believe the unique type of this species to be more or 

 less abraded ; the elongate setae of its dorsal surface may be, 

 therefore, more numerous in a fresh specimen. The sex of 

 the type is doubtful. If it is a female there is a possibility 

 of its being a member of the aggregate A, but that seems 

 improbable on account of its front claws not having the com- 

 pressed form which is quite conspicuous even in the females 

 of the species that I have placed in A. If it were in A it 

 would stand beside II. fraternus, Blackb., from which it 

 differs by, inter alia, the basal joint of the hind tarsi very 

 much longer in proportion to both the 2nd and 3rd joints. 

 The trilobed outline of the head is well developed and lightly 

 divided, with the middle lobe scarcely smaller than a lateral 

 lobe. The small carina near the apex of the suture is re- 

 markable, and may be sexual. 



South Australia; Yorke Peninsula. 



