REPORT OF THE STATE ENTOMOLOGIST I908 79 



I wish to acknowledge my indebtedness to Prof. J. II. 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 i, 1907 



KEYS FOR DETERMINING THE GENERA OF THE IPIDAE ^SC0L\:TINAE) 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 Sclnvz. (which has been omitted from the generic 

 key) is distinguished from all other described North American 

 wScolytidae by the sculpture of the pronotum : " Disk in both sexes, 

 with a longitudinal, tubcrculated, and distinctly elevated, median 

 area which projects beyond the base of the thorax as a triangular 

 lobe,'' forming a '' hoodlike projection over the scutelluni." 

 [E. A. Schwarz. Psyche, v. 8, sup. i, p. ii] 



Families 



a Head narrower than the prothorax ; ist tarsal segment shorter than the 

 others united ; eyes oblong or divided [see pi. 4, fig. 6 ; pi. 5, fig. 10, 11; 



pi. 8, fig. 21 ■ pi. 9, fig. 25 ; pi. II, fig. 36, 37] Ipidaei 



aa Head broader than the prothorax; ist tarsal segment as long as the 



others united ; eyes round, subconvex [see pi. 3, fig. i, 2] 



Platypodidae 

 The family Platypodidae is represented in America, north of Mexico, 

 by one genus. Platypus Herbst. 



Subfamilies of the Ipidae 



o Anterior " tibiae produced at the upper apical angle beyond the tarsal 

 insertion into a mucro or hitid process." (Blandford) [see pi. 3, 



fig. 5] 

 b Foretarsus with the 3d segment bilobcd ; upper or outer border of the 



forctibiae unarmed or vvitli few very small teeth 



Eccoptogasterinae (Scolytini) 

 bb Foretarsus with the 3d segment not bilobed ; the outer border of the 



forctibiae strongly dentate [see pi. 3, fig. 3] Erineophilinae 



aa Forctibiae not produced at the upper or outer apical angle beyond the 

 tarsal insertion into a mucro or bifid process [sec pi. 4, fig. 6; pi. 5, 

 fig. 10, 11] 



• Ganglbauer. Miuichener Koleopterologische Zsitschrift. 1903, band 1,311. 



