394 



somewhat irregular square, the two front ones being rather 

 more apart than the two hind ones. The elytral punctures 

 are much as on the preceding species, except that the larger 

 subseriate ones are almost confined to the suture. The type 

 appears to be a male. 



PORITHEA PLAGIATA, Blackb. 



The type of this species was from the Tweed River, and 

 was described as having on the elytra "maculis singulis later- 

 alibus antemedianis niagnis et fascia communi unchdata ante- 

 apicali sat lata testaceis." In the Blackburn Collection there 

 were four specimens marked as belonging to the species, but 

 not as co-types (the type is in the British Museum) ; they were 

 all from Northern Queensland. There are other specimens 

 before me from Dorrigo, in New South Wales, to the 

 Endeavour River in Queensland, and these demonstrate that 

 the elytral markings are variable; in general, however, the 

 pale markings on each elytron consist of a subtriangular or 

 very irregular median blotch, usually not touching the suture, 

 but occasionally doing so, and containing towards the side a 

 dark spot, but this spot may be so continued as to divide 

 the blotch into two unequal spots; the sinuous apical fascia 

 may occupy from a little more to a little less space than the 

 derm behind it ; or the pale markings may be so extended 

 as to occupy most of the surface, when the darker parts appear 

 as a subtriangular basal space (followed or not by a few 

 small spots), a wide postmeclian fascia, and a shorter apical 

 cue. The male (I took a pair in cop. in the Cairns district) 

 is usually smaller than the female, with longer antennae, 

 prothorax somewhat longer in proportion, and front tibiae 

 more curved and wider at apex. 



The species of the genus (excluding intorta, unknown to 

 me as such) may be tabulated as follows: — 



Pale portion of elytra confined to apical third apicalis 

 Pale portion not so confined. 



Apex of elytra dark ... plagiata 



Apex of elytra pale. 

 Pale apical portion connected with other 



pale portions ... ... parewthica 



Pale apical portion disconnected ... ... obliqva 



Gastrophacodes, n. g. 

 Head moderately large. Eyes rather large, coarsely 

 faceted, semi-circularly notched, upper portion much smaller 

 than lower portion. Clypeus and labrum membranous. 

 Mandibles short, strong, semi-circularly incised near apex. 

 Antennae moderately long, inserted in front of ocular exci- 

 sions, second joint very short, the following ones somewhat 



