XYLEBORUS. 215 
able to distribute them satisfactorily. Whether there are two distinct species, or 
merely local races, is a point on which I express no more decided opinion than Eichhoff 
himself has done. All that can be asserted is that ordinary methods of discrimination 
between them are insufficient for complete separation. 
Although Eichhoff has recorded X. badius as well as X. torquatus from Cuba ‘4, with 
this exception the former is entirely paleotropical, the latter neotropical; this seems 
to point to a real geographical distinctness, and perhaps to an error in the locality of 
the specimens said to come from Cuba. In that case all our specimens must be referred 
to X. torquatus alone. 
Xyleborus torquatus, X. badius, X. perforans (Woll.) (=X. kraatzi, Kichh.), and 
X. affinis, Kichh., constitute a group of forms which in long series are found to be 
united by intermediates in the order named. At present I incline to the belief that 
the latter two are really distinct. | 
There is, after all, no reason whatever why each of these closely-allied races may not 
be a true species, as the known differences in habit seem to show, although individual 
examples cannot always be assigned to one form rather than to another. 
30. Xyleborus interstitialis. 
9. Xyleborus interstitialis, Eichh. Rat. Tom. p. 375°. 
Hab. Mexico!; Guatemata, Cerro Zunil (Champion). 
I have seen no type of this species, but among the numerous specimens of X. affinis 
from Cerro Zunil I have found three which appear to be distinct and agree 
completely with Hichhoff’s description of this species: ‘XY. affint maxime similis 
et geminatus, sed angustior, elytris exacte in ordinem lineato-punctatis, interstitiis 
impuuctis, levibus ; declivitate apicali convexiuscula, punctata, subnitida.” 
To this it may be added that the specimens referred to are darker than any examples 
of X. affinis, the elytra being piceo-ferruginous behind and having a few piliferous 
punctures on the alternate interstices, a feature mentioned by Hichhoff in his detailed 
description as occasionally present. 
31. Xyleborus catulus, sp. n. 
Fem, Cylindrica, subelongata, nitida, flavo-testacea, parcissime breviter pilosa; prothorace oblongo, apicc 
rotundato, dorso ante medium subtransyerse elevato, posterius obsolete punctato; elytris subparallelis, 
postice ad apicem oblique rotundatum angustatis, regulariter lineato-punctatis, interstitiis planis, hinc 
illius setis seriatis aspersis, 1° et 3° in declivitate convexa tuberculatis. 
Long. 2 millim. 
Female. Cylindrical, somewhat elongate, shining, yellow-testaceous, with very short scanty pubescence. Front 
somewhat flattened, punctate, the mouth fringed. Prothorax a little longer than broad, its basal margin 
slightly curved, the hind angles obtusely rounded, the sides subparallel to before the middle, the apex 
moderately strongly rounded; disc with an antemedian subtransverse elevation, asperate in front, its 
basal half shining, with indistinct sparse punctuation, the interspaces subreticulate. Scutellum small, 
triangular. Elytra scarcely as wide as the prothorax, and more than half as long again, truncate at 
