623 



remarks on albidus, but on all of them the longitudinal 

 impression on the head is distinct only between and adjacent 

 to the antennary sockets. A male from Cooper Creek with 

 the coxal armature very light, is very densely clothed all over 

 with white pubescence, closely applied to the derm, in addition 

 with numerous rather short subereet setae (dark on the 

 pronotum and antennae, pale elsewhere), and over all with 

 long and fairly numerous erect dark hairs; on the elytra the 

 blackish spots are as on the typical form ; the clothing in 

 general also (except as to its colour) is as on that form ; the 

 large basal tubercles are more obtuse than usual. 



Pascoe in describing sticticus, thought it was probably a 

 variety of arachne, and I am convinced that such is the case; 

 Blackburn identified a specimen from Narrabri (New South 

 Wales) as belonging to it, there was another in his collection 

 from Queensland, and I have seen two others from Queensland 

 that agree with these; they are all males, with the conspicuous 

 coxal armature of the male of arachne. The disc of the 

 pronotum is much more densely clothed than on the typical 

 form, thus obscuring the punctures, but I can find no 

 structural differences. Some specimens from the Daly River, 

 Darwin, and Wyndham, are smaller (8^-11^ mm.) than 

 usual, the elytral spots feebly defined and a vague fascia 

 connecting the prothoraeic tubercles across the disc; the 

 pubescence on the pronotum is denser than on most specimens 

 of arachne, but not so dense as on the variety sticticus. 



MlCROTRAGUS MORMON, PaSC. 



M. assimilis, Blackb. 



On this species the sexual differences of the palpi are 

 quite as pronounced as on Inctuosus ; the pronotum has an 

 impunctate space along the middle, but on the basal half 

 there is a distinct groove. The length varies from 16 to 25 

 mm. 



The type of assimilis is now in the British Museum, no 

 other specimen was in the Blackburn collection, nor was 

 mormon represented there ; but I am convinced that assimilis 

 was described from a female of mormon; there are several 

 specimens in the South Australian Museum that agree well 

 with Blackburn's description, and although Pascoe made no 

 mention of the lateral granules of the elytra, these are 

 sometimes but little in evidence. Blackburn considered that 

 assimilis differed from mormon "by the absence of hairs' ' 

 (but Pascoe did not mention any such), and by the apex of 

 elytra, but the tips of these are variable. 



Two specimens in the Museum differ considerably from 

 the ordinary form; one, A, is a female from Kuminin (it is 



