270 INSECTA. 



Of these latter, those species whose labial palpi are evidently 

 longer than the external maxillary palpi, and with the penultimate 

 joint longer than the last, form two subgenera. 



Megacephala, Lat. 



Labrum very short and transversal; first joint of the labial palpi 

 much longer than the second, and projecting beyond the men- 

 tum(l). 



Oxycheila, Dej. 



The labrum forming an elongated triangle, first joint of the labial 

 palpi not much longer than the second, and not extending beyond 

 the emargination of the mentum(2). 



In the following species the labial palpi are at most about the 

 length of the external maxillary palpi, the last joint is longer than 

 the penultimate. They also form two subgenera. 



Euprosopus, Lat. Dej. 



The third joint of the labial palpi thicker than the last; the three 

 first joints of the anterior tarsi of the males somewhat elongated, 

 flattened, carinated beneath, and equally ciliated on both sides; very 

 large eyes. They keep on trees(3). 



Cicindela, Lat. 



The true Cicindelae only differ from the Euprosopi in the third 

 joint of the labial palpi, which is not much thicker than the fourth; 

 and in their anterior tarsi, whose three first joints, in the males, are 

 much elongated, more strongly ciliated on the internal side than the 

 external, and are destitute of a carina beneath. 



Their body is usually of a darker or lighter green, mixed with 

 various brilliant metallic tints; the elytra are marked with white 

 spots. They prefer dry, warm situations, run with considerable 

 swiftness, take wing the moment they are approached, but alight at 



(1) Cicindela megalocephala, Fab.; Oliv., II, 33, 11, 12; C. Carolina, Oliv. lb., xi, 

 2; Megacephala euphratica, Hist. Nat. des Coleop. d'Eur., I, 1, 2. For the other 

 species, see Dejean, Species des Coleopteres, I, p. 6, et seq. 



In the United States, Meg. Carolina and Meg. virginica, both beautiful species. 

 Am. Ed. 



(2) Cicindela iristis, Fab. ; Oliv., Coleopt., II, 33, iii, 35; Oxycheila tristis, Dej., 

 Species Gene'r. des Coleop. I, p. 16; Cicindela bipustuhta, Lat.; Voy. de Humb 

 et Uonp].; Obscr. d'Anat. et de Zool., No. X1U, xvi, 1, 2. 



(3) Cicindela 4-notata, Hist. Nat. des Coleop. d'Europ., I, i, 6; Euprosophus 

 4-notatus, Dej., Spec. Gener. des Coleopt. [, p. 151. 



