Pityogenes. | RHYNCHOPHORA, 443 
male with the terminal excavation of the elytra 
terminated behind with small setigerous crenu- 
oe cary sor a ee Pe BIDENTATUS, Herbst, 
ii. Body behind thorax two and a half times as long 
as broad ; male with the terminal excavation of , 
the elytra without setigerous crenulations , . P. QUADRIDENS, Hart, 
The following character is given for Section IT. by some authors :— 
‘Male with the internal margin of each elytron armed behind with a 
very small tooth, followed by a large somewhat curved spine”’; in 
P. bidentatus, however, this tooth does not occur in the type form, but 
only in certain specimens which must be referred to the var. B. of 
Eichhoff’s monograph ; the same applies to P. guadridens ; the small 
third tooth is not found in the type; there is a larger form with the 
three teeth on each elytron (P. bistridentatus, Hich.) which has been 
thought to be a distinct species ; the females of P. bidentalus and P, 
quadridens have small tubercles bearing hairs instead of the large teeth 
in the males, and in the latter species the female often has a thick 
greyish mass of hairs clothing the forehead 3 1t is, however, doubtful 
whether the two species are really distinct, 
A confusion regarding the sexes has sometimes arisen ; Eichhoff in 
his monograph “ Ratio Tomicinorum, 1878,” follows Thomson and 
Chapuis and calls the toothed forms the female ; in his ‘‘ Kuropaischen 
Borkenkifer, 1881,” he corrects this, and says he does so after micro- 
scopical examination of the generative organs, and also because the 
details of their life history require it as formerly shown by Ratzeburg ; 
this appears to settle the question. 
P. chalcographus, L. Reddish-brown, with the thorax and base 
of elytra pitchy, or entirely reddish-brown, shining, with scanty 
pubescence ; antenne and legs testaceous ; thorax longer than broad, 
scabrous in front, finely and rather closely punctured behind, with a 
central line and the side portions of the punctured space smooth ; elytra 
with very fine punctured stria which are almost obsolete on dise, and 
wanting at sides towards apex, apical impression near suture deep and 
broad and furnished on each side with three tubercles, of which the first 
is situated a little behind the middle. L. 15-2 mm. 
Under bark of firsand pines ; not common; Mickleham (Power) ; London district, 
old pines (Stephens) ; Scarborough ; Northumberland and Durham district, “ Sunder- 
Jand,” Rev. R. Kirwood ; Scotland, very local, Clyde district (Glasgow), 
P. bidentatus, Herbst. (Uidens, F.), Pitchy-black, rather shining, 
clothed with fine and scanty pale pubescence ; antennae ferruginous ; 
legs fusco-testaceous ; thorax longer than broad, seabrous in front, 
rather strongly punctured behind, with a narrow elevated central line 
and a round space at sides smooth; elytra with punctured strie at 
sides and rows of rather large punctures on dise, interstices with rows of 
smaller punctures, L, 2-22 mm, 
