382 MEMOIRS ON THE COLEOPTERA 



elytra are shorter and more narrowed posteriorly than in Trichius, 

 not opaque and glabrous throughout, but always shining and 

 sparsely pubescent, generally but not always with an opaque spot 

 at the sides between two transverse tomentose lines; these features 

 are so constant as to constitute a generic character beyond much 

 doubt, although I do not have before me all the forms presented 

 by the species, subspecies and aberrations of the European genus. 

 The genus Trichiotinus is very rich in taxonomic forms but is 

 difficult to deal with from the standpoint of satisfactory classi- 

 fication, because of the uncertain systematic value of some of the 

 units, but, so far as the abundant material at hand will admit, the 

 following disposition of them seems at least plausible: 



Elytra each with two rather strong convex costse, the depressed flat 

 intervals between them finely and very densely punctate .2 



Elytra with the costae feeble or obsolete, the intermediate surfaces not 

 very finely or relatively so densely punctate 7 



2 Pygidium with more or less conspicuous pubescence in both sexes, 

 though always less developed in the male 3 



Pygidium with short and sparse hairs, denser in intermedius, sometimes 

 almost bald 4 



3 Body moderately stout, black or piceous-black, the elytra nearly 

 black to ferruginous, always with the flanks between and behind the 

 lateral transverse tomentose lines, which do not extend inwardly 

 further than the crest of the flanks, opaque and darker in color; 

 head, prothorax and under surface with conspicuous yellowish- 

 cinereous pubescence;, head with rather large prominent eyes, the 

 surface finely, closely punctate; clypeus not quite as long as wide, 

 parallel, the apex broadly rounded, very gradually and barely visibly 

 reflexed and feebly, medially sinuate, perfectly similar in the sexes; 

 prothorax (o 71 ) nearly as long as wide, the sides feebly converging to 

 apical third, then oblique to the very feebly sinuate apex, or ( 9 ) 

 larger and broader, nearly a third wider than long; punctures fine 

 and close in both sexes, the vestiture dense, the surface obtusely 

 impressed along the median line and with a tomentose patch near 

 each angle, often obsolete however; base finely and strongly beaded; 

 scutellum rather narrow, longer than wide, finely, closely punctate 

 and densely pubescent; elytra distinctly shorter than wide, widest 

 near basal third; hairs not dense, short, longer and bristling near the 

 suture; punctures outside of the two depressed vittae fine and sparse; 

 pygidium (d 71 ) slightly wider than long, with very short hairs, longer 

 on the pronounced subapical umbo, or ( 9 ) much wider than long, 

 rather less convex, with longer, denser hairs, not umbonate subapic- 

 ally, having in both sexes wavy transverse, acutely and minutely 

 serrulate lines, less close in the male and with a large elongate tomen- 

 tose area at each side, relatively smaller in the female and never 

 extending across the base; hind tarsi very slender, almost twice as 



