bo 
o4 RHYNCHOPHORA. 
line, the granules stronger and more asperate towards the apex and arranged in concentric lines. 
Scutellum rounded, infuscate. Elytra less than a half longer than the prothorax, less parallel-sided, 
more gradually rounded at the apex than in D. mewicanus, with strie of close and moderately strong punc- 
tures, the sutural stria distinctly, the others feebly impressed ; interstices narrow, slightly convex, with 
very fine uniseriate punctures bearing short suberect sete ; the hinder third strongly declivous, but not 
evidently flattened, shining, with the punctures weaker and the interstices feebly tuberculate. Legs and 
antennee pale, constructed as in the preceding species. 
Hab. Mexico, Vera Cruz (Salé). 
One specimen; easily distinguished from D. mexicanus by its smaller size and 
different elytral sculpture. 
PITYOPHTHORUS. 
Pityophthorus, Eichhoff, Berl. ent. Zeitschr. 1864, p. 39; Rat. Tom. p. 173; Leconte, Rhynch. 
N. Am. p. 349 (pars). 
Crypiurgus, Zimmermann, Trans. Am. Ent. Soc. 1868, p. 142 (pars). 
Cryphalus, Leconte, Trans. Am. Ent. Soc. 1868, p. 153 (pars). 
The genus Pityophthorus is one of the richest of Tomicid genera, being surpassed in 
this respect only by Xyleborus. The species extend over Europe and N. Asia, Japan, 
North and South America, and Madagascar. At present North America contains the 
majority of those described, the number, after excluding certain forms which are more 
properly to be referred to other genera, amounting to more than twenty. 
Several species have been independently described by Eichhoff and by American 
zoologists under separate names. The synonymy thus caused has been much reduced 
by a collation made by Eichhoff, and published after his death (Proc. U.S. Nat. Mus. 
xviii. p. 609); bus it is to be regretted that he did not accompany it with a full list of 
the species submitted to him and a statement as to which forms of Leconte and others 
(authentically named) he accepted as good species distinct from his own. 
It is most difficult to identify specimens of this genus without comparison with types, 
and as I have seen and compared Jess than half the North-American forms, I may 
have put forward some synonyms in the following pages. ‘The examination and 
description of the Central-American Pityophthorit were done by me some years ago, 
and in revising for press I have re-examined them with a view to reducing the number 
of species, but, except in one instance, I have been unable to do so, although I do not 
regard my results, based usually on short series or single examples, as wholly satisfactory. 
I describe or enumerate eighteen species, and have in addition left some half-dozen 
specimens unidentified. 
In Pityophthorus the antennal club is somewhat variable; usually it is oval or 
oblong-oval, clearly articulate, with nearly transverse sutures visible on both sides. 
Exceptionally the basal suture alone is visible (as in P. aylotrupes, Kichh.); in P. incom- 
positus, P. incommodus, and their allies the club is larger, suborbicular, with strongly 
curved sutures. The prothorax is always bordered at the base. ‘The apex of the last 
