COLEOPTERA. 129 



C.equestris, Fab.; Oliv., Col., V, 97, i,3. Closely allied to 

 the following species, but rather larger, and only found in 

 aquatic localities on Mint. It is green above and black beneath; 

 margin of the abdomen and the feet yellowish. 



C. viridis, L, ; Oliv., Col., II, 29. Length one line and a half; 

 it only differs from the equestris in the puncta of the elytra, 

 which form regular lines near the suture; the thighs are most 

 commonly black. 



The larva lives on Thistles, and most commonly on the Arti- 

 choke. Its body is extremely flat, and the whole margin is 

 covered with spines; it covers itself with its faeces, which it 

 keeps suspended in a mass on a kind of fork situated near the 

 orifice of the anus. The nymph is also much flattened, and has 

 delicate and serrated appendages along its sides; its thorax is 

 broad, rounded anteriorly, and conceals the head. 



In the larva of a species found in St. Domingo — C. ampulla, 

 Oliv. — the faeces are disposed in numerous and articulated 

 threads, which resemble a sort of wig. The 



C. nobilis, L. ; Oliv,, lb., II, 24. Yellowish grey, with a gol- 

 den-blue streak near the suture, which disappears with the death 

 of the Insect *. 

 In the second tribe, or the Chrysomelinje, the antennae are remote, 

 and inserted before the eyes, or near their internal extremity. These 

 Insects never leap. With those of the following tribe, and some be- 

 longing to the preceding family, they compose the genus Chrysomela 

 of Linnreus, which we have restricted by the admission of others, on 

 account of its great extent. 



Those species in which we find the above-mentioned characters, 

 form, as in the earlier entomological works of Fabricius, two genera. 

 The first, or 



Cryptocephalus, 



Is composed of Chrysomelinse, in which the head is plunged verti- 

 cally into an arched or hood-like thorax, in such a manner that the 

 body, most commonly in the form of a short cylinder, or almost ovoid 

 and narrowed anteriorly, when viewed from above, appears as if trun- 

 cated at that extremity and destitute of a head. The antennae of 

 some are more or less serrated or pectinated ; those of others are long 

 and filiform. The last joint of the palpi is always ovoid. 



Sometimes the antennae are short, pectinated, or serrated from the 

 fourth or fifth joint. 



Here the exterior margin of the elytra is straight, or is but slightly 

 emarginated ; the posterior angles of the thorax are rounded and not 

 arched, and the anterior ones are not bent underneath. The boby is 

 always in the form of a short cylinder ; the antennae are always free, 

 and the eyes entire or but slightly emarginated. The males fre- 



* For the other species, see Oliv., lb. ; Fab., Syst. Eleut. ; Schcenh., Synon. 

 Insect, II, p. 134, and 209. 



