Coleopterological Notices^ VI. 7*73 



in Florida, in Avhich region they seem to particularly abound. 

 There are, however, also a large number of northern Atlantic 

 species, but only a single one is known at present from the Pacific 

 coast. A considerable number of Mexican species have been re- 

 cently described by Mr. Champion. 



I have no hesitation whatever in separating our species into 

 numerous genera, the generic characters being as pronounced as 

 in almost any other group of Coleoptera, but as the types of 

 Xylophilus, Euglenes and other of the older genera are unknown 

 to me at present, I am forced to give them all distinct names, the 

 probability being that none of them will prove entirely identical 

 with any hitherto described.* These genera are the following : — 



Muzzle not prolonged before the point of antennalinsertlon 2 



Muzzle prolonged; body very minute 11 



2 — Head constricted at base; epistonial suture deep and distinct 3 



Head not constricted at base 10 



3 — Basal joint of the hind tarsi very long 4 



Basal joint of the hind tarsi short, much shorter than the remainder 9 



4 — Eyes deeply emarginate 5 



Eyes feebly or moderately emarginate, the notch sometimes almost obsolete.. .6 

 5 — Head deeply sinuate at base; antennie thick and subcylindrical, the second 

 joint obliquely truncate; vestiture short, matted and duplex. ..Eloiilis 

 Head truncate at base; vestiture long, stift' and simple. 



Antennae inserted within the eye on the emarginating canthus, strongly 



flabellate in the male, not observed in the female Eiueliniis 



Antennse simple in both sexes, inserted just without the eyes, -which are 



generally not quite .so large Zoiiaiites 



6 — Prothorax not prominent at the sides; eyes more or less coarsely faceted as 



usual 7 



Prothorax angulate and prominent at the sides anteriorly 8 



7 — Second and third antennal joints small PlloiiialllS 



Tliird antennal joint elongate. 



Prothorax as wide as the head; last antennal joint abruptly enlarged. 



Ariotiis 



* In general neatness of appearance, diversity of structure and individual 

 rarity the Xylophilinse may be fancied to bear much the same general rela- 

 tion to the other Anthicidaj that the Eucneminaj bear to the rest of the Elater- 

 idse, and the Aveights of the two subfamilies, with regard to the remainder of 

 their respective families, are about equal. The ratio of species to genera among 

 our representatives of Xylophilinae is at present nearly 3, while among the 

 Eucneminaj it is only about 2.5, and even in the Cerambycidaj it is not quite 

 3.5. The absolute value of the generic differences I hold to be about equal in 

 the three cases. 



