446 RHYNCHOPHORA. [ Trypodendron. 
taken by Mr. Matthews, Mr. Blatch, myselfand others ; I have records from Scotland, 
but they probably apply to the next species, and I have also a record from the 
Manchester district for T. lineatum, which must most probably be referred to this 
species. 
T. lineatum, Ol. Very closely allied to the preceding, with 
which it has been often confused, as it strongly resembles it in colour 
and general appearance; it is, however, smaller and may be known by 
the shape of the club of the antennz, which is rounded on both sides 
and at apex ; the sculpture of the thorax is very much finer, the anterior 
tubercles being much smaller and more depressed, and the pubescence is 
more scanty and shorter ; the punctures of the striz on the elytra are 
finer, the interstices are not rugose (in J. quereus they are finely 
wrinkled), and the general lineation is less dark and less defined. L. 
23-3 mm. 
In bark of fir logs; not common, or rather very local; Scotland, Tay and Dee 
districts (Braemar and Rannoch). 
XYLEBORUWS, Lichhoff. 
This genus contains about seventy or eighty species which are very 
widely distributed throughout the greater part of the world, representa- 
tives occurring in Europe, Asia, North, Central and South America, 
South Africa, the Australian region, Tahiti, &c.; they vary consider- 
ably in general appearance and are in many cases remarkable for the 
great difference in the sexes; this is very noticeable in X. dispar as its 
name implies; about nine species occur in Europe, of which three are 
found in Britain ; the males are by far the scarcer of the two sexes and, as a 
rule, are comparatively seldom met with ; the species are usually supposed 
to bore galleries into the sap wood of the trees they are attached to, but 
some of them inhabit various trees; Mr. Blandford has kindly sent me 
the following note on the genus :— 
‘The species do not merely live in the sapwood but burrow deeply 
into the tree ; certain exotic ones follow the habits of Anobiidz and live 
in such various substances as sugar-cane, corks, bamboos, &c. I have 
specimens of XY. perforans (Woll.). from sugar-cane and cacao tree, and 
Wollaston has found it in corks, the stems of Jatrophea, &c. 
‘The males do not leave the spot where they are bred and where they 
impregnate the females; the small assemblages of males sometimes found 
are widowers whose wives have deserted them. The males are much 
rarer than the females; in sugar-cane from §S. Vincent I have found 
between two and three hundred examples of X. perforans among which 
was one solitary male ; and Mr, Waterhouse has found much the same in 
the same species.” 
The chief characters of the genus are as follows :—tibie broad, 
more or less serrate and furnished with furrows for the reception of tle 
tarsi which are rather short ; prosternum excised as far as the cox and 
