ON THE SERRICORNES. 375 



and nymphs. It is of a fine red, and furnished with six 

 short scaly feet, and two small crooks equally scaly, placed 

 near the hinder part of the body. About a year is necessary 

 for its transformation into the perfect insect. It is in the 

 same place where it has lived and grown that its metamor- 

 phosis takes place. Although provided with wings and 

 elytra, the hardness of which may secure it, it is not easy to 

 conceive how the perfect insect can go to deposit its eggs in 

 the domicile of these Apiarice, without being at least repulsed 

 by the number of these insects, if not wounded by their 

 stino-s. 



It has been supposed that the Megachile apiaria itself col- 

 lected the eggs of this clerus among the stamina of flowers, 

 and that it transported them into its habitation, with the wax 

 which it brings there. This conjecture is not altogether im- 

 probable, but yet it cannot be adopted, until confirmed by 

 observation in a more positive manner. 



The larva of another species, clerus alvearius, destroys 

 those of our domestic bees. 



After Opilo of Latreille, we add two new genera, with the 

 following characters. 



Cymatodera. This has the labrum transverse, short, bi- 

 lobate ; the maxillary palpi with the last joint short, broad, 

 subsecuriform ; the labial palpi with last joint truncate, oval ; 

 the tarsi cup-shaped and lobed ; the antennae filiform, the last 

 joint the largest. The species we name Hopei. It has the X 

 head, thorax, the base of the elytra, and a subtriangular spot 

 on each side of the elytra, black ; the rest of the elytra, an- 

 tennae, palpi and legs, pale yellowish red; the head and 

 thorax punctured, hairy ; the elytra striated with two rows 

 of impressed dots. This species is from Mexico, and the 

 height is ten lines and a half. 



The next genus we have named Stigmatium, with the max- U 

 illary palpi elongate, triangular ; the labial with the joints 



