270 
ZOOLOGICAL LITERATURE. 
178), besides the descriptions of numerous new species, contains a general 
account of the North- American forms of this family and a scheme of generic 
classification which, as it dilfers in some respects from those proposed by 
other authors, may be reproduced here. The tribes, into which Leconte 
divides the family, are Flatypini, Tomicini, Scolytim, and Hylurgini (this 
is evidently the case from his treatment, although the tliird group, including 
only the genus Scolytus, is not indicated by him). Of the Platyjnni, Leconte 
cites 9 North-American species of Platypus, for the characters of which he 
refers to the monograph of Chapuis. The Tomicini are divided by him into 
the following genera : — 
I. Head not completely concealed by the prothorax from above j prothorax 
not tuberculate in front. 
A, Club large, Hat, not annulatod \ funiculus 2-jointed. 
1. Ohyptuhgus (Erichs.). 
B. Club smaller, oval, annulatod j funiculus 8-jointod. 
2. Aphanarthhum (Woll.). 
II. Head completely overhung by prothorax, which is very convex and 
tuberculate in front. 
A. Club of antennae large, much compressed, transversely annulated on 
both surfaces ; funiculus 1-6-jointed 8. Cryphalus (Erichs.). 
B. Club of antennae large, rounded, entirely corneous on one side, 
circularly annulated on the other, or solid. 
a. Eyes divided; club solid 4. Xyloterus (Erichs.). 
h. Eyes emarginate ; club annulate .. 5. Xyleborus (Eichh.). 
C. Club of antennae entirely corneous on one side, transversely annulated 
on the other ; sutures undulated. 
a. Elytra deeply excavated at tip ; margin of excavation strongly 
toothed 6. Tomicus (Lat.). 
D. Club of antennae pubescent, except an elongated space reaching from 
base to middle ; sutures loop -shaped, parallel with the smooth 
’ space 7. Micracis, g. n. 
To Aphanarthrum Leconte refers Ilylastes ptimilus (Mann.) from Alaska, 
the type of Dolurgus (Eichh., vide infra) ; Leconte says the funiculus con- 
tains only 3 joints instead of 4 as described by Eiclihofl*. Cryphalus includes 
Corthylus (Erichs.) and Corthylomimus (Ferr.), forming the author’s first 
group, containing C. fasciatus, mali, and punctatissimus (Zimm., vide infra), 
scutellaris (Lee.), and the first two new species described by Leconte ; the 
second group, with the funiculus 2-jointed, includes C. dissitnilis (Zimm.), which 
Leconte compares with Ilypothonemus (J.-Duv.) ; the third group, having 
the funiculus 4- or 6-jointed, contains the greater part of the species, namely 
of previously described species, Tom. materiarius{Fitch),T. 2 nibipeimis(Lec.), 
and Bostr. nitididus (Mann.), also Crypturgus minutissimus, comatus, pullus, 
and pxdicarius (Zimm.), and the rest of Leconte’s new species. C. pullus, 
pidicarius, atratulus, nitidulus, and aspendus belong to Trypophloeus (Fairm.). 
Xyloterus includes Apate hivittatus (Kirby) = cavifrons (Mann.), X. 
scahricollis, and Bostr. politus (Say). To Xylehoi'us Leconte refers Scolytus 
pyri (Harr.), Bostr. xylographus {fi 2 rf)—pini (Eichh.), Bostr. septentrionis 
(Mann.) = J?. semicastaneus (Mann.) and B. affaher (Mann), the last two, 
with X. granicollis (Lee.), belonging to Dryoccetes (Eichh.) ; the other spe- 
cies are described as new by Zimmermann and Leconte. Tomicus agrees 
