Mr. J. Walton on the genus Trachyphloeus. 221 



small fascicle of scales which has the appearance of a small spine, 

 the anterior margin strongly elevated, deeply constricted in front, 

 with a deep dorsal furrow, and with a small impressed furrow on 

 each side near the posterior angles; the elytra ovate-spherical, 

 distinctly punctate-striate, sometimes maculated or variegated 

 posteriorly with white and fuscous scales, and the erect scales 

 more or less abraded ; the anterior tibia of the male has at the 

 apex externally a strong tooth, and another in front which is bifid 

 at its extremity ; the female has similar appendages, but they are 

 very minute. 



Certainly the most abundant insect of the genus, and found 

 in similar situations and in the same localities as TV. scaber. 



4. Trachyphloeus squamulatus, Oliv. (1789), Schonh. 



— aristatus, Gyll. (1827), Schonh. 



— stipulatus. Germ. 



— hispidulus, Steph. lUustr. 

 Cure, setosus, Kirb. MSS. 



British specimens of this insect, which I presented to Schon- 

 herr and Germar, were identified by them as Tr. aristatus of Gyll. 

 I possess an insect under that name from Germar which agrees 

 with my series of specimens. I have adopted the oldest name 

 for this insect on the authority of Chevrolat, who sent to me on 

 two several occasions examples of Tr. squamulatus of Oliv., which 

 is very distinctly a small immature variety of Tr. aristatus of 

 Gyll. ; yet Gyllenhal has described the former (from a specimen 

 also sent by Chevrolat) as specifically different from the latter, 

 but I am persuaded the want of varieties of this rare and variable 

 insect has led him into an error. It is necessary to make a few 

 observations having reference to the differences between the tw^o 

 descriptions of Tr. aristatus^ and Tr. squamulatusf by Gyllenhal. 

 The major part of my specimens have the head, rostrum and 

 thorax black, with the elytra ferruginous or piceous, but imma- 

 ture specimens occur entirely rufous or rufo-ferruginous ; all have 

 the antenna inserted near the apex of the lateral furrow on the 

 rostrum near to the mouth ; yet when the scape is placed at right 

 angles with the rostrum, the antenna seems to be inserted in the 

 middle, but the scape is curved just at the base in front, and 

 must be extended forward to see the true point of insertion ; the 

 small and proportionably narrow specimens have the thorax com- 

 paratively less expanded at the sides, and all my British and 

 foreign specimens have the thorax constantly and distinctly ru- 

 gulose-puBctate, not obsoletely alutaceous ; the greater part have 

 either the dorsal furrow or the fovea distinct or indistinct, in 

 others they are very obsolete. 



* Gyll. Ins. Suec. iv. p. 613. f Schonh. Syn. Ins. ii. p. 492. 



