ORDER COLEOPTERA. 427 



hemispherical, and generally convex or gibbous, with the cor- 

 slet always more broad than long, and smooth, the legs termi- 

 nated by strong spurs, and the tarsi very frequently ciliated. 

 The extremity of their mandibles presents two teeth. They 

 embrace the family of the Hydrophilidea of Dr. Leach, 

 or the genus hydrophilus of Fabricius. 



Some have but six articulations in the antennae, and their 

 chaperon is emarginated. Such are 



Spercheus, Fab. 



Spercheus emarginatus. Fab. Panz. Faun. Insect. Germ. 

 XCI. 4. M. Bourdon, a French naturalist, who is at 

 present exploring the States of the Republic of Columbia, 

 first discovered this species in the neighbourhood of Paris. 



In the following, the antennae are always composed of 

 eight or nine articulations, and the chaperon is entire, or 

 slightly concave at the anterior edge. 



One species which has been communicated to us by our 

 friend Dr. Leach, presents some singular characters, which 

 have determined me to consider this insect as the type of a 

 new sub-genus,* that of 



Globaria, 



Which I shall name thus, because its body is almost sphe- 

 rical, compressed laterally, and it appears capable of putting 

 itself into a ball, after the manner of the agathidii. Its 



* It seems to come more naturally near the Berosus of Dr. Leach ; 

 but in consequence of the number of articulations in the antennee, I have 

 deemed it proper to place it immediately after the Sperchei. One might, 

 however, reverse this order, commencing with this sub-genera, which 

 have nine articulations in the antennae, and terminating by those in 

 which they have one and three less, or by Globaria and Spercheus. 



