Insects. 7065 



above. The labium and other parts of the mouth also deserve some 

 notice, exhibiting in many respects a great aflSnity to Deinopsis and 

 other Brachelytrous insects. As I observed in my former paper, I 

 think this family intimately connected with the Brach elytra. The 

 well-known similarity of their habits, the high caste of their physical 

 powers, the striking resemblance of their outward shape, and, as far as 

 our present investigations reach, of the various organs of feeding and 

 motion, all concur in placing them in close proximity to that extensive 

 section. I am persuaded that this class is much more numerous than 

 is generally supposed, and that many species are yet unknown. It is 

 not a little remarkable that in the course of one year as many as six 

 species of a genus, so long known and sought for by British Coleop- 

 terists, should have occurred for the first time in this country, but it is 

 a fact which holds out abundant promise of future success ; all the 

 specimens of the past year were taken under the bark of decaying 

 trees, and, where this habitat can be met with, I do not think the 

 species of tree or the locality itself is of much importance ; the collector 

 must be furnished with a large amount of patience and persev^erance, 

 and then he need not despair of success. Besides the Ptinellae the last 

 season was productive of several novelties in the other genera of this 

 family, two of which, Ptiliura brevicolle and Ptenidium picipes are 

 now described for the first time. 



I had intended in this paper to have revised the whole list of British 

 Trichopterygidae, as much yet remains to be done before we can 

 hope to arrive at a thorough uniformity of nomenclature ; but for the 

 want of reference to the works of some continental authors I am not 

 yet able to do this effectually, and must, for the present, content 

 myself with noticing a few of the most important corrections. The 

 insect described in my former paper as " Pteryx mutabilis" has proved 

 to be indentical with the the T. suturalis of Gillmeister, although 

 nothing can be less descriptive of the animal than his figure, or more 

 inappropriate than the name he has given it. I have also ascertained 

 by comparison with the French collections that the T. mollis of Mr. 

 Haliday is the T. fucicola of the continental authors ; and as the 

 latter name possesses the right of priority, it must in future be used 

 to designate this species in our lists. It will, I fear, be also necessary 

 to change the name of Titan, under which I separated T. abbrevia- 

 tellus from the rest of the family, as that term is objected to on the 

 score of preoccupation by a genus of exotic Longicorns. In lieu of 

 Titan, therefore, I propose to substitute Elachys (e^a%yf), perhaps the 



XVIII. 2 N 



