2 MISC. PUBLICATION 6 9 8, U. S. DEPT. OF AGRICULTURE 



need for a comprehensive and up-to-date treatment of this economi- 

 cally important family. Leslie's excellent revision of the known 

 species of this family, published between 1896 and 1906, is not always 

 available to American students of the group. Furthermore, although 

 Lesne established a number of new genera in this work, he neglected 

 to designate genotypes, with the result that there has been some dif- 

 ference of opinion among subsequent workers as to the application 

 of certain generic names. Ltesne treated the Lyctidae as a subfamily 

 of the Bostrichidae, but the author of this publication prefers to 

 follow Kraus a and consider the Lyctidae as a separate family. 



Members of this family are elongate, cylindrical in form. They 

 greatly resemble and are often mistaken for Scolytidae. From the 

 Scolytidae they may usually be distinguished by their tuberculate 

 and rasplike pronotum, by their straight instead of elbowed antennae 

 with a 3- or 4-segmented club, and by their 5-segmented tarsi. The 

 outer surface of these beetles is very hard, and all parts fit closely to- 

 gether as is usually the case with wood-boring beetles. The prothorax 

 is occasionally furnished with hooks or frontal teeth in addition to 

 the rasplike tubercles, and the posterior part of the elytra is fre- 

 quently provided with one or more tubercles. These latter structures 

 are probably used by the beetles in moving about in their tunnels. 

 The femora and tibiae are broad, the latter frequently toothed on one 

 margin. Some species exhibit sexual dimorphism and have the hooks 

 and teeth of the pronotum and the tubercles of the elytra curiously 

 modified. 



KEY TO THE SUBFAMILIES AND TRIBES OF BOSTRICHIDAE 



1. Head not deeply inserted in the prothorax, visible from above 2 



Head deeply inserted in the prothorax, not visible from above 4 



2. Front of head produced into a lobe on each side of clvpeus; disk of pro- 



notum tuberculate DYSIDINAE, p. 3. 



Front of head not produced into a lobe on each side of the clvpeus; disk of 

 pronotum not tuberculate PSOINAE, p. 5. 3 



3. Anterior coxae distinctly separated by the prosternal lobe ; anterior tibiae 



with a large arcuate spine at apices POLYCAONINI, p. 5. 



Anterior coxae not or only partially separated by the prosternal lobe; 

 anterior tibiae without a large arcuate spine at apices. _ PSOINI, p. 15. 



4. Pronotum completely margined laterally- ENDECATOMINAE, p. 19. 

 Pronotum not completely margined laterally, rarely with a distinct lateral 



carina on each side posteriorly 5 



5. Posterior tarsi shorter than tibiae; pronotum rounded or ogival, rarelv 



truncate, in front DINODERINAE, p. 23. 



Posterior tarsi as long as, or longer than, tibiae (not quite so long in some 

 specimens of Apatides fortis (Lee), but then the pronotum is emarginate 

 in front) ; pronotum truncate or emarginate in front 



BOSTRICHINAE, p. 51. 6 



6. First and second segments of antennal club compressed or nabellate 7 



First and second segments of antennal club caliciform (cup-shaped) 



DINAPATINI, p. 51. 



7. Intercoxal process of abdomen tabular (T-shaped) or triangular 



BOSTRICHINI, p. 53. 

 Intercoxal process of abdomen lamellate (I -shaped) 



XYLOPERTHINI, p. 101. 



1 Kraus, E. J. III. — a revision of the powder-post beetles of the family 



LYCTIDAE OF THE UNITED STATES AND EUROPE. U. S. Dept. Agr. Ent. Tech. Bui. 20, 



pp. 111-138. 1911. 



