Mr. Westwood on the Sexes in Cetoniidae. 339 



None of these authors were however aware that the pos- 

 session of a corneous tooth in the mando or inner lobe of the 

 maxillae is in some cases a sexual character ; and consequently, 

 as they have omitted to notice from which sex their descrip- 

 tions have been derived, the characters of all their groups will 

 require a careful revision before they can be considered as 

 satisfactorily established. 



Having some years ago, whilst making the dissections of the 

 typical Goliathi for the * Coleopterist's Manual/ ascertained 

 the remarkable dentation in the maxillae of the types of that 

 group, which differ so materially from all the other Cetoniidae 

 in this respect, I have carefully examined these organs in 

 the other allied Cetoniidae, especially as I had determined to 

 figure some of the more curious forms in my * Arcana Ento- 

 mological For this purpose I made, in the spring of the pre- 

 sent year (1841), drawings of several species and of their ana- 

 tomical details, some of which were published in the first 

 number of the work just mentioned, which appeared on 

 the 1st of May. We here find the maxillae of Mycteristes 

 rhinophyllus, male, armed on the upper lobe with several 

 teeth ; and the same is the case in both sexes of M. Cumingii ; 

 the maxilla of the female of that insect being like that of the 

 male, I did not figure it. In Dicronocephalus Hardwickii S 

 the lower lobe of the maxillae is quite simple, and the upper 

 lobe corneous, straight, and acute at the tip. So far, it is true, 

 no sexual variations were observed ; but on dissecting the male 

 Goliathus (Eudicellus) Morgani, of which Mr. Hope possesses 

 both sexes (in April 1841), I observed that the maxilla was 

 destitute of any tooth on the lower lobe ; whereas I found the 

 females of G. (E.) frontalis and aurata, in Mr. Melly's cabinet, 

 armed with a strong tooth on this part ; and on returning to 

 town from Liverpool (which I had visited in company with 

 Dr. Burmeister, in order to study Mr. Melly's collection), I 

 found the same character in the female of G. (E.) Morgani in 

 Mr. Hope's collection*. I likewise detected the same character 

 in the mando of the female of G.polyphemus in Mr. Turner's 

 collection, and also in the female of G. torquatus in Mr. Hope's ; 

 whereas in the male of the latter species, as Prof. Burmeister 

 informs me, the inner lobe of the mando is unarmed. 



Since Dr. Burmeister's departure from England, I have 

 been much engaged in dissecting the majority of the genera 

 and a great number of the species of the Cetoniidae, with the 

 view of investigating the natural classification of that family, 



* I have recently received a letter from Prof. Burmeister, dated Nov. 14, 

 1841, in which he mentions his having discovered this sexual distinction in 

 Got.. {Eudicellus) Daphnis, Smithii, and the species allied thereto. 



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