Lamellicorn Genus Cryptodus, and its Allies. 21 
is the only known insect among the Cetoniide that has not ten 
joints to the antenne.”’” This is indeed a singular character, and 
is as much at variance with the characters of the Dynastide as 
with the Cetoniide ; but its smgularity is greatly increased when 
it is mentioned, that it is only a specific one, since in a new species 
in my collection the antenne are certainly 10-jointed. 
Referring, then, this singular genus to the Dynastide, I will 
shortly notice its characters as contrasted with those of that family. 
It was introduced by Mr. Mac Leay into the family Zrogede on 
account of its possessing 9-jointed antennz, sharp arched horny 
mandibles, and maxillee terminated by sharp horny hooks, “quam- 
vis mento labroque omnino differt.” We now find the 9-jointed 
antennz no longer a generical character ; and my own and Dr. 
Burmeister’s dissections (published in Mr. Hope’s Coleopterist’s 
Manual, and in the Genera Insectorum,) have shown that the 
horny mandibles and maxille of the Dynastide vary in a very 
great degree in the form and position of their teeth; the con- 
cealed labrum is the character of the Dynastide, and the large 
mentum exists in the several Dynastideous genera described 
below. In the majority of the Dynastide, however, we find only 
the upper lobe of the maxille dentate, whilst the lower one is 
terminated by one tooth in Cryptodus; but there are other Dy- 
nastide which have also this character. ‘The want of occipital 
and thoracic horns, and the broad recurved clypeus, are pecu- 
liarities of Cryptodus, but they are not confined to it, but are 
found in many Dynastide, whilst the elongated depressed form of 
the body occurs in Phileurus, and other allied genera; on these 
accounts I consider that Cryptodus belongs to the family Dynas- 
tide, and that its relationship with Cremastocheilus is only one of 
analogy. 
The following are the characters of the second* species of the 
genus mentioned above. 
Cryptodus Tasmannianus, West. 
Niger, nitidus, oblongus, punctatus; antennis 10-articulatis ; 
mento basi truncato, prosterno antict producto, margine 
antico fere recto. 
Long. corp. lin. 93, lat. elytr. lin. 43. 
Habitat in Terra Van Diemenni. 
In Mus. nostr. &c. 
* Mr. Mac Leay states that he possesses two species from New Holland, so 
that it is probable a third species exists. It is greatly to be hoped that Mr. Mac 
Leay will now furnish us with some details respecting the habits of this and other 
equally singular Australian insects. 
