6 ANNULOSA JAVANICA. 
in this case the proper view of the maxillz is, that they terminate in two lobes, generally ciliated, 
and often confluent, the external lobe being in its typical state connected with the internal lobe 
by an articulation, and the internal lobe being terminated by an unguis. Of this typical maxilla 
Passalus affords a good example ;* and among the Petalocera, we find it distinguishable in the 
whole family of Geotrupide. We have an example of the confluence of the maxillary pieces, 
that is, of a complete departure from the typical maxilla, in Agus ; and, indeed, the Thalero- 
phagous Petalocera in general, but particularly the Anoplognathide, exhibit little or no traces of 
the above typical structure of the maxilla. 
The Maxilla of such Coleoptera as have Chilopodiform larvee, possesses, however, a peculiar 
character, which may be considered as typical in reference to the groupe. The external lobe is 
not only connected with the internal by an articulation, but itself consists of two pieces. 
Sometimes, as in the Linnean genera Cicindela, Carabus, Dytiscus, and Gyrinus, this biarticulate 
external process of the maxilla is slender and cylindrical, and consequently palpiform, occasion- 
ing these genera to be characterized as having four maxillary palpi. Sometimes, as in the 
Linnean genera Hydrous}+ and Staphylinus,{ this biarticulate process is dilated and not palpi- 
form. Sometimes again, as in certain species of the Linnean genus Silpha, the two pieces 
which form the external lobe of the maxilla are confluent or soldered together, although the 
typical structure remains visible, or the outer piece is converted into a penicilliform lacinia, 
adapted to the particular economy of the insect. 
The tribe of Chilopodomorpha is divisible.as follows, into five stirpes i.e. races; or, which is 
the same thing, into two groupes; one of which contains two stirpes, and is typical of the tribe: 
while the other contains three stirpes, more immediately conducting to other tribes, and which 
may therefore be termed aberrant.§ 
Stirpes. Exempla typica. 
1. Normal groupe, consisting of insects having 
linear or setaceous antennz, with the exterior 
biarticulate process of the maxilla palpiform. 
Averuaca of Clairville. 
1. GEODEPHAGA ....0..0+000000. Carabus. 
2, HyDRADEPHAGA,.....0++4+. Dytiscus. 
2. Aberrant groupe, consisting of insects having (3. PHILHYDRIDA. +040. .0000 006 ydrophilus. 
their antenne clavate, or, at least, gradually 
thickening towards the apex, while the ex- 
ternal lobe of the maxilla is not palpiform. 5. Bracuetytra ( Lat.) ...Staphylinus. 
4. Necropyaca (Lat.) ...Silpha. 
CHILOPopoMoR?PHA, 
That this tribe is a natural groupe, sufficiently appears from the above series of five stipes 
returning into itself, and forming as it were a circle. Thus, from the Geodephaga, or genera 
Cicindela and Carahus of Linnzeus, we pass by means of Omophron to the Hydradephaga, or 
genera Gyrinus, and Dyticus of Linnzus. From these again we pass to the Linnean genus 
Hydrous, which, until his entomological career was nearly over, the great Swede confounded 
always with Dyticus. Part of the Philhydrida, such as the modern genus Elophorus, was by 
Linnzeus 
" For this and the following examples, the reader may consult the figures given in the first part of the Hore 
Entomologice. 
+ Hydrophilii Lat. Gen. Ins. et Crust. vol. ii. p. 62. 
t Kirby, Lin. Transact. vol. 14, p. i. p. 100. 
§ The terms applied by M. Fries to such groupes, viz. centric and radiant, I have not thought proper to adopt, for 
reasons that will be found at length in the Transactions of the Linnean Society, Vol. 14, p. 59. 
