SCOLYTIDE. 89 
Subfam. PLATYPODINE. 
This subfamily has been extended to include Chapuisia in preference to making that 
genus the type of a distinct subfamily. 
As here defined, it will not include the Scolytoplatypodides, none of which are found 
in the New World, and which must be regarded as a special subfamily or as a group 
to be placed in the Scolytine. 
The Platypodine comprise two groups of unequal size :— 
1. Antennal funiculus four-jointed ; third tarsal joint simple . . . . . . Platypodides. 
2. Antennal funiculus five-jointed; third tarsal joint bilobed. . . . . . . Chapuisiides. 
Group PLATYPODIDES. 
Platypide, Chapuis, Monographie des Platypides, Mém. Soc. Liége, xx. (1866). 
The fifty-one Central-American species contained in this group fall entirely into two 
genera—Platypus represented by forty-six, and Tesserocerus by five species. Of this 
number no less than thirty have been previously described, a larger proportion than 
has been the case with other genera of Scolytide. This is due chiefly to the assistance 
obtained from M. Sallé by Chapuis when he was monographing the group. Fortunately 
almost all the species described by Chapuis are represented in our collection, and 
types of the remainder, with one or two exceptions only, have been procurable for 
comparison. As all Platypids bore deeply into wood they are seldom obtained without 
special search, and several of the most striking forms are known to us by solitary 
examples. Lacordaire (Gen. Col. vii. p. 8355, nota 6) has attempted an estimate of the 
total number of species of Scolytide, based on that of the Platypodides in Chapuis’s 
monograph, and assuming that the numerical proportion which these bear in Europe to 
the rest of the Scolytide is maintained throughout the world. But in Europe the 
Platypodides comprise less than 2 per cent. of the Scolytide, in North America under 
4 per cent., in Japan nearly 9 per cent., and in Central America over 18 per cent.; so 
that they form an increasing proportion in warm countries, and no calculation can be 
based on their relative frequency. 
I have before suggested (Trans. Ent. Soc. Lond. 1594, p. 127) that Chapuis may have 
erroneously identified the sexual characters throughout his monograph, but being unable 
to examine fresh specimens I did not then care to disturb his determinations. Since 
that time Mr. Hopkins has published the results of his dissections of P. guadridentatus 
(Oliv.) and P. compositus, Say (Canad. Ent. xxvi. p. 274), and in accordance with his 
results, which agree entirely with my own, I here reverse the application of the external 
BIUL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 6, December 1895. NN 
