260 



importance in distinguishing these insects. S. meridianus 

 type is a female, but is certainly not convexiusculus, Macl., 

 if the latter is angustatus, Blackb. I have mounted and care- 

 fully compared the aedeagi of all ten types and very many 

 other specimens, and consider my conclusions certain." 



I have not felt justified in breaking up the abdomen to 

 examine the aedeagus of any of the male types or cotypes, 

 but three figures are given from some specimens carefully 

 compared with them. 



Five males agreed closely with rectangulus, and the 

 aedeagus of one is figured (pi. xxxii., fig. 41). The aedeagi 

 of the others all differed slightly from it and from each other; 

 on one of them the two serrations on each side were extremely 

 feeble. 



Four males agreed closely with a specimen considered by 

 Mr. Blackburn to be adelaidae; of these one has the aedeagus 

 as on pi. xxxii., fig. 39, two had it somewhat similar although 

 not exactly the same, but that of the fourth (pi. xxxii., fig. 

 40) was without the subapical notch. 



It would appear, therefore, that the aedeagus in some 

 species is just as unreliable as external features. 



Semanopterus subcostatus, Cast. (Phileurus), Hist. Nat., 

 ii., p. 116 (Chiroplatys, Mast. Cat., No. 2478). 



S. adelaidae, Hope: Trans. Ent. Soc. Lond., iv., p. 281. 

 S. subaequalis, Hope: I.e., p. 282. 

 S. depressus, Hope: I.e., p. 282. 



S. depressiusculus , Macl. : Trans. Ent. Soc. N.S. Wales, 

 ii., p. 200. 



PI. xxxi., figs. 17-20; pi. xxxii., figs. 36, 39, 40. 



Blackburn of cubcostatus remarked that it "might be 

 almost any Semanopterus, but is probably adelaidae, Hope." 

 Arrow says,< 9 ) "I have already ( 1Q ) expressed my opinion that 

 the three names bestowed by Hope (adelaidae, subaequalis, 

 and depressus) refer all to one species. To this species 

 depressiusculus, Macl., and meridianus, Blackb., also apply, 

 and it should be called S. subcostatus, Cast." In neither 

 reference, however, does he give the grounds for his belief, 

 and presumably the type of subcostatus is not in the British 

 Museum. As regards meridianus, I consider that as a 

 synonym it should be transferred to convexius cuius, and com- 

 ment upon it under that species. 



(9)L.c, 1914, p. 267. 



(10) L.c, Ser. 8, vol. viii., 1911, p. 156; in this reference, 

 however, he did not include adelaidae. 



