338 Mr. Westwood on the Sexes in Cetoniidje. 



belonging to the group of Insectivora, I have had an oppor- 

 tunity of examining a skeleton, now in the possession of 

 Major Christie, and which Mr. Stuart himself had prepared 

 at the time the animal was killed. This skeleton, by the pre- 

 sence of the marsupial bones, distinctly shows that the qua- 

 druped in question belongs to the group Marsupialia. It also 

 demonstrates that there was an important error in the dental 

 formula as given me in the MS. of ISIr. Stuart, — the very 

 error, indeed, which led me to think that the animal might 

 eventually be found to belong to the Insectivora. The true 

 dental formula, as taken by me from the skeleton, is as fol- 

 lows: — 



Incisors ^ + canines ^ -|- pseudomolars |^ + mo- 

 lars 4=1 = 46. 



4 — 4 



Now this formula is that of Phascogale, from which genus 

 our animal however differs in the three lateral incisors of the 

 upper jaw being of equal size, and also in the pseudomolars 

 being all of equal size. I am however in hopes of soon pos- 

 sessing a specimen from Spring Cove, when I shall be able to 

 determine how far this animal differs from the genus Phasco- 

 gale, or whether it may not be safely assigned to it. 



I remain, &c. 



Elizabeth Bay, near Sidney, Aug. 9th, 1841. W. S. MacLeAY. 



XLIII. — Notice of a hitherto unobserved Character distinctive 

 of the Sexes in certain Cetoniidae. By J. O. Westwood, 

 Esq., F.L.S., &c. 



In a short notice published in these ' Annals' for October last, 

 I communicated the curious discovery, that whilst the females 

 in certain groups of Lucanidce possess a short horny tooth at 

 the extremity of the basal or internal lobe of the maxillee, their 

 males are destitute of this character. I have now to annovmce 

 the existence of precisely the same sexual distinction in cer- 

 tain groups of Cetoniidae. Until veiy recently the maxillae of 

 the species in this family have been described as possessing 

 entirely membranous lobes, with the exception of Cremasto- 

 cheilus, in which this organ is horny, and armed in both its 

 lobes with strong curved corneous teeth. More recently Gory, 

 Percheron, and MacLeay have detected corneous teeth in the 

 maxilUe of other Cetoniidce, which character has accordingly 

 been employed, especially by the last-named author, to cha- 

 racterize many of the groups which he has proposed in his 

 quinarian arrangement of the family, published in Dr. Smith's 

 ' African Zoological Researches.' 



