258 



with the exception of dentatus ; by the courtesy of the Curator 

 of the Australian Museum (Mr. R. Etheridge) I have also 

 been able to examine the types of Macleay's two species, and 

 Mr. Arrow sent specimens which he identified as solidus and 

 •subcostatus. 



Semanopterus convexiusculus, Macl. : Trans. Ent. Soc. 

 N.S. Wales, ii., p. 201. 



S. anqustatus, Blackb. : Trans. Roy. Soc. S. Austr., 



1887, p. 232; 1896, p. 252. 



S. minor, Blackb.: I.e., 1887, p. 233; Proc. Linn. Soc. 



N.S. Wales, 1888, p. 1413. 

 S. longicollis, Blackb. : Proc. Linn. Soc. N.S. Wales, 



1888, p. 1412. 



S. rectangulus, Blackb. : Trans. Roy. Soc. S. Austr., 



1895, p. 41. 



S. persimilis, Blackb. : I.e., p. 42. 



S. carinatus, Blackb. : I.e., p. 43. 



S. meridianus, Blackb. : I.e., 1896, p. 250. 



S. concentricus , Blackb. : I.e., p. 251. 



S. tricostatus, Blackb. : I.e., p. 52. 



S. distributus, Blackb. : I.e., p. 252. 



PI. xxx.; pi. xxxi., figs. 21, 22; pi. xxxii., figs. 30-35, 41. 

 To the synonymy of this species as given by Arrow the 

 two last names have been added, making it as above. In 

 Blackburn's table of the genus primary use was made of the 

 basal angles of the prothorax, and in fact it is difficult at 

 first to accept the idea that a specimen whose basal angle of 

 prothorax is without the slightest incurvature, as on the type 

 of convexiusculus (pi. xxxii., fig. 30) can be conspecific with 

 another whose basal angle is very conspicuously notched, as 

 on the cotype of rectangulus (pi. xxxii., fig. 32), especially 

 when these differences are accompanied by others in the 

 pygidium, prosternum, etc. However, from examination of 

 the actual types Mr. Arrow came to his conclusion, and in 

 this I am reluctantly compelled to follow him. I have very 

 carefully studied Blackburn's table of the genus with the 

 cotypes (marked as such by himself), and believe that in 

 preparing it he could only have closely examined the types 

 themselves, and made no allowance for variation. For in- 

 stance, concentricus, angustatus, and minor are stated to have 

 the sides of prothorax "strongly incurved in front of base"; 

 those of two cotypes of concentricus, a cotype of angustatus, 

 and two cotypes of minor have the sides just perceptibly 

 incurved to base (pi. xxxii., fig. 31); on the type female of 

 concentricus there is no incurvature at all, the sides being 



