DEXITHEA.—PLAGIONOTUS. 53 
DEXITHEA. 
Dexithea, Thomson, Syst. Céramb. p. 185; Lacord. Gen. Long. ix. p. 65. 
A genus well characterized by Lacordaire as being intermediate in its essential 
features between Trichoxys and Plagionotus. It contains only two Mexican species. 
1. Dexithea klugi. 
Clytus Klugii, Lap. & Gory, Mon. Clyt. p. 51, t. 10. f. 60. 
Clytus (Plagionotus) Klugii, Cheyr. Ann. Soc. Ent. Fr. 1860, p. 490, 
‘Dewxithea Klugii, Thoms. Syst. Céramb. p.185. 
Hab. Mexico (Boucard). 
2. Dexithea fabricil. | 
Clytus (Plagionotus) Fabricii, Chevr. Ann. Soc. Ent. Fr. 1860, p. 490, t. 9. f. 6". 
Dexithea Fabricti, Lacord. Gen. Col. ix. p. 65, note. 
Hab. Mexico, Paso del Macho, Vera Cruz (Sallé1). 
PLAGIONOTUS.. 
Plagionotus, Muls. Rectif. et Add. & la Monogr. des Longicornes (1842) ; Lacord. Gen. Col. ix. p. 66. 
Glycobius, Leconte, Smithson. Misc. Coll. 265, pt. 1. p. 8319 (1873). 
Lacordaire would not venture to extend the limits of this genus beyond the few 
European and Mediterranean species contemplated by its founder. But Clytus 
speciosus, Say, of North America, the type of Dr. Leconte’s genus (lycobius, is 
perfectly congeneric with the European Plagionotus detritus, and species of imilar 
structure of antenne and legs and form of thorax and sternal processes occur in 
Mexico. Other species have been discovered in Eastern Siberia; the genus has 
therefore a wide range in the northern hemisphere. As in other modern genera of 
Clytini, the characters strongly marked in the extreme forms (which are nearly always 
chosen as the types) rapidly dégenerate from species to species until all distinction 
from allied genera disappears. Thus Plagionotus siculus is scarcely distinguishable 
generically from Clytus floralis; similar blending of generic characters occurs in the 
Mexican fauna. 
1. Plagionotus regalis. 
Clytus (Plagionotus) regalis, Chevr. Ann. Soc. Ent. Fr. 1860, p. 4881. 
Hab. Mexico, Tepansacualco (Sallé 1) - 
2. Plagionotus astecus. 
Clytus (Plagionotus) astecus, Chevr. Ann. Soc. Ent. Fr. 1860, p. 489’. 
Hab. Mexico (Truqui!, Boucard). oon 
