Bx. 
188 RHYNCHOPHORA. 
distinct from TZ. cribricollis, they do not show sufficiently important or constant 
differences to justify their separation. The North-American 7. cacographus, Lec. 
(=. grandicollis, Eichh.) differs from the present species by its larger size and 
impunctate elytral interstices. 
4, Tomicus concinnus. (Tab. VII. figg. 9; 9a, apex of elytra.) 
Bostrichus concinnus, Mann. Bull. Mosc. 1852, ii. p. 8581; 1858, iii. p. 234”. 
Tomicus concinnus, Lec. Trans. Am. Ent. Soc. 1868, p. 164°; Rhynch. N. Am. p. 367‘; Eichh. 
Rat. Tom. p. 232”. 
Xylocleptes concinnus, Lec. Proc. Am. Phil. Soc. xvii. p. 623°. 
Tomicus hirsutus, Eichh. Berl. ent. Zeitschr. 1867, p. 4027. 
Hab. Nortu America, Sitka in Alaska 1 2° 4 © 7, California (Ricksecker).—MEXxico ®, 
Ventanas (Forrer); GuaTeMALA, Totonicapam, Quiché Mountains (Champion). 
Eight examples were taken at Totonicapam, and one each at Ventanas and the 
Quiché Mountains. The specimen from California was detected in a series of 
T. plastographus sent to me by Mr. Ricksecker. The specimens vary in colour from» 
ferruginous to black, in size and in the development of the second elytral tooth, which 
is sometimes small, sometimes large and situated at the upper extremity of a well- 
marked ridge extending almost to the third tooth. This is perhaps a sexual character. 
It is on Eichhoff’s authority® that the Mexican examples are regarded as identical 
with Mannerheim’s species, as he appears to have had opportunities of comparing 
specimens from Mexico and Alaska. 
The species is intermediate in generic characters between Xylocleptes, Ferr., and 
Tomicus, Latr. Leconte ® has referred it to the former genus, whereas Eichhoff retains 
itin Tomicus. With Xylocleptes it agrees in the shape of the club and its sutures, and to 
a less extent in the punctuation of the elytra and the formation of the apical impression. 
The latter has, however, a trispinate margin, the general appearance is rather that of 
a Tomicus, and the structure of the mentum agrees entirely with that of 7. serdentatus 
(Boern.), and not with the very different one of X. bispinus (Duftschm.). Moreover, it 
is a conifer-feeder, while the only two species of Xy/locleptes of which the habits are 
known feed respectively in the stems of clematis and wild gourd. 
I myself prefer to regard it as a Tomécus, and attach more weight to the structure of 
the mentum than to that of the antennal club. It is, however, quite open to anyone 
to keep it in Xylocleptes, should he so prefer. 
XYLOCLEPTES. 
Xylocleptes, Ferrari, Borkenk. p. 37; Eichhoff, Rat. Tom. p. 216. 
This genus, the type of which is the common European X. dispinus (Duftschm.), 
contains some six species distributed in Europe, North Africa and Syria, North and 
South America. 
