6 ANNULOSA JAVANICA. 



in this case the proper view of the maxillae 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 Geolrupidce. We have an example of the confluence of the maxillary pieces, 

 that is, of a complete departure from the typical maxilla, in Mgus ; and, indeed, the Thalero- 

 phagous Petalocera in general, but particularly the Anoplo gnat hid '«, exhibit little or no traces of 

 the above typical structure of the maxilla. 



The Maxilla of such Coleoptera as have Chilopodiform larvae, 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, Car alms, 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 antennas, with the exterior] 1- Geoiiephaga Carabus. 



§ "J biarticulate process of the maxilla palpiform.) 2 . Hydradephaga Dutu 



S v Adephaga of Clairville. I 



it 



tiscus. 



I T2. Aberrant groupe, consisting of insects having (3. Philhydrida Hydrophilus. 



J J their antennas clavate, or, at least, gradually ) , * T 



3 | thickening towards the apex, while the ex-) 4 ' Necromaga (Lat.J ...Silpha. 

 ^ ternal lobe of the maxilla is not palpiform. V s - Brachelytra fLat.J ...Staphylinus. 

 That this tribe is a natural groupe, sufficiently appears from the above series of five stirpes 

 returning into itself, and forming as it were a circle. Thus, from the Geodephaga, or genera 

 Cicmdela and Caralms of Linnaeus, we pass by means of Omophron to the Hydradephaga or 

 genera Gyrinus, and Dyticus of Linnaeus. From these again we pass to the' Linnean Vnu< 

 Hydrous, which, until his entomological career was nearly over, the great Swede confounded 

 always with Dyticus. Part of the Pkilhydrida, such as the modern genus Elophoms, was by 



Linnaeus 



For this and the following examples the rpndpv man m „„,i, .. r ■ , 



B CA<ull F J «s. me leaaei may consult the figures given in the first part of the Horcr 

 hntomologw/r. ' 



t Hydrophilii Lat. Gen. Ins. et Crust, vol. ii. p. 62. 

 i Kirby, Lin. Transact, vol. 14, p. i. p. 100. 



§ The terms applied by M. Fries to such groupes, W , centric and radiant, I have not thought proper to adopt for 

 reasons that wul be found at length in the Transactions of the Linnean Society, Vol. 14, p. 59^ 



