COLEOPTERA. 327 



here the fourth and seven following annuli are furnished on each 

 side with a conical, membranous, flexible filament with bearded 

 edges. The twelfth ring has four similar, but much longer 

 ones, directed more posteriorly. Two very slender tracheae 

 traverse the whole length of the body, and receive an air vessel 

 from each filament. The last ring is very small, and is termi- 

 nated by four long and parallel hooks. This larva inhabits the 

 water, from which it issues in the beginning of August to be- 

 come a chrysalis. It encloses itself in a little oval cocoon, 

 pointed at the ends, formed of a material drawn from its body 

 resembling grey paper, which it fixes to the reeds. Very com- 

 mon in Europe(l). 



FAMILY II. 



BRACHELYTRA. 



In the second family of the Pentamerous Coleoptera we find 

 but one palpus to the maxillae, or four in all 5 the antennas, 

 sometimes of equal thickness, and at others slightly enlarged 

 at the end, are usually composed of lenticular or graniform 

 joints ; the elytra are much shorter than the body, which is 

 narrow and elongated, and the coxae of the two anterior legs 

 are very large ; near the anus are two vesicles which the 

 animal protrudes at will. 



These Coleoptera compose the genus 



Staphylinus, Lin. 



The Staphylini have been considered as forming the passage from the 

 Coleoptera to the Forjiculas, the first genus of the following order. 



(1) For the other species see Oliv., Col. IK, No. 41, and Schcenh., Synon. In- 

 sect., II, No. 55. The Gyr. minutus and bicolor, Fab., are also found in the vici- 

 nity of Paris. The largest of the species, all of which are foreign to Europe, have 

 no apparent scutel and but four palpi. 



M. Mac-Leay, Jun. Annul. Javan. I, p. 30 forms a particular genus, Dineu- 

 tes, with those in which the labrum is not ciliate, the palpi are clavate, the ante- 

 rior legs the length of the body, and the termination of the antennae is partly 

 pointed. He quotes but a single species, the D. politics. 



Add American species of Gyrinus, the Gyr. wmtricanus, emarginatus, analis and 

 limbatus. Am. Ed. 



