2GG [October, 



antennae in the male sex. X. oculatus, Gyll. {= pygmceus, Muls.), 

 and X. pygmcBus, Degeer {^^iwpulneus, Fabr.), belong to it. One 

 only of these, the latter, is known as yet as British, though it 

 seems not unlikely that both may eventually be found here. 

 JEuglenes is apparently not represented in the New World. 



3. Aderus, Westw. : includes the well-known European X. bolefi, 



Marsh. (= populneus, Panz.), the Japanese X. gihhulus, Mars., 

 and the Central American X. tantillus, Ch. It has in both sexes 

 the second and third joints of the antennae very short and sub- 

 equal, together not equalling the fourth in length. 



4. Anidorus, Muls. & Rey : contains the Eui-opean X. nigrinus, Germ., 



X. sanguinolentus, Ivies., &c. Vt seems chiefly to be distinguished 

 by the stout and elongate third antennal joint in the male. I 

 have not seen any American species quite agreeing with it. 



5. Olotelus, Muls. & Eey : contains chiefly those species that will 



not fit into either of the preceding groups. I fail to discover 

 any salient character by W'hich to distinguish it. Its authors in- 

 cluded it in X. pimctiger, Muls. & Eey, X. pruinosus, Kies., X. 

 Jlaveolus, Muls. & Rey, and X. negJectus, Duv. (= nigripennis, 

 Villa) ; and five others are placed in it in the last European 

 Catalogue. 



Amongst the American species are to be found numerous groups 

 or sections of the genus of equal or greater value, of which four of 

 the most important may be particularized : — 



1. Antennse strongly flabellate in the male, simple in the female. 



X. Melsheimeri, Lee., X. flabellatus, Ch., &c. 



2. Antennae stout ; filiform or 8ubfiliform,and with very elongate apical joint in the 



male ; thickened outwardly and with apical joint ovate in the female. Hind 

 femora broadly dilated in the male. 



X. lacertosus, Ch., X.foi'ticornis, Ch., X. hasalis, Lee, &c. 



3. Antennse (c?) with joints I — 3 slender, and 4 — 11 flattened and subtriangular ; 



thorax 4-foveate ; hind femora {$) very stout. X.femoralis, Ch. 



4. Sides of the thorax more or less dilated in front and compressed at the middle ; 



eyes small in both sexes and almost bai'e ; body elongate and Anthiciform. 

 X. anthicoides, Ch., X. quercicola, Schwarz, &c. 



The total number of species recorded is now about 100 — Europe 

 23, Algeria 5, Japan 8, Ceylon 3, America north of Mexico 16, Central 

 America 37, &c. ; none are yet known in America from south of the 

 Isthmus of Panama, but representatives of the genus are certain to 

 be found there eventually.* Notwithstanding their small size the 



* Since these remarks ^s.'ere written I have seen in Marseul's collection in Paris (now the 

 property of the Museum d'llistoire Natiu-(;llc) and in the collection of M. Rcnfi Obcrthur at 

 llennes numerous unnamed species of X ylophilus from Tropical South America. 



