REPORT OF THE STATE ENTOMOLOGIST 1908 79 
{ wish to acknowledge my indebtedness to Prof. J. H. Comstock 
for the material he so kindly furnished, to Dr E. P. Felt for help- 
ful criticism, and my especial obligation to Prof. A. D. McGilli- 
vray for his frequent assistance and advice. 
Entomological Laboratory, 
Cornell University, July 1, 1907 
KEYS FOR DETERMINING THE GENERA OF THE IPIDAE (SCOLYTINAE) AND 
PLATYPODIDAE (PLATYPODINAE) OF AMERICA NORTH OF MEXICO 
The arrangement of family and subfamily names in the follow- 
ing keys seems the most natural at present. Published keys have 
been freely used. 
Cactopinus Schwz. (which has been omitted from the generic 
key) is distinguished from all other described North American 
Scolytidae by the sculpture of the pronotum: ‘“ Disk in both sexes, 
with a longitudinal, tuberculated, and distinctly elevated, median 
area which projects beyond the base of the thorax as a triangular 
lobe,’ forming a “hoodlike projection over the scutellum.” 
iene schwarz. Psyche, v.8, sup. 1, p. 12] 
Families 
a Head narrower than the prothorax; rst tarsal segment shorter than the 
others united; eyes oblong or divided [see pl. 4, fig. 6; pl. 5, fig. 10, I1; 
iL Sh Vike, Zine ply Oy mikes AGS sol sme ites ors Vilinogoomococcde sboaccs Ipidael 
aa Head broader than the prothorax; Ist tarsal segment as long as the 
others united’; eyes round, subconvex |isee pl. 3, fie. 1, 2il...........--- 
Platypodidae 
The family Platypodidae is represented in America, north of Mexico, 
by one genus, Platypus Herbst. 
Subfamilies of the Ipidae 
a Anterior “tibiae produced at the upper apical angle beyond the tarsal 
insertion into a mucro or bifid process.” (Blandford) [see pl. 3, 
fig. 5] 
b Foretarsus with the 3d segment bilobed; upper or outer border of the 
foretibiae unarmed or with few very small teeth.................... 
Eccoptogasterinae (Scolytini) 
bb Foretarsus with the 3d segment not bilobed; the outer border of the 
foretibiae strongly dentate [see pl. 3, fig. 3].......... Erineophilinae 
“aa Foretibiae not produced at the upper or outer apical angle beyond the 
tarsal insertion into a mucro or bifid process [see pl. 4, fig. 6; pl. 5, 
fig. 10, Ir] 

1 Ganglbauer. Munchener Koleopterologische Zeitschrift. 1903, band 1, 311. 
