592 FAMILY IV. SCOLYTIDyE. 



Subfamily III. IPIN/E. 



KEY TO TRIBES OF SUBFAMILY IPIN,35. 



a. Pronotum with anterior dorsal area commonly rugose; head con- 

 cealed from above; anterior tarsi with third joint simple. 

 6. Anterior tibiae broader towards apex or serrate on outer margin. 

 c. Abdominal sternite 7 with posterior margin always rounded. 



Tribe I. CRYPHALINI, p. 592. 



cc. Abdominal sternite 7 with posterior margin rarely rounded. 



(I. Pronotum and elytra clothed with scales or hairs, very rarely 



glabrous. Tribe II. IPINI, p. 626. 



dd. Pronotum and elytra without scales, commonly glabrous or 



sparsely pubescent. Tribe III. CORTHYLINI, p. 640. 



lib. Anterior tibise not distinctly broader toward apex, or not serrate on 



outer margin. Tribe IV. MICRACINI, p. 646. 



aa. Pronotum with anterior dorsal area commonly smooth; head exposed 



or rarely concealed from above. 



e. Antennal club subglobose, compressed to laminate, never conical. 

 f. Body slender to moderately stout; pronotum at least as long as 

 broad. Tribe V. CRYPTURGINI, p. 650. 



//. Body stout; pronotum broader than long. 



Tribe VI. PHLCEOTRJBINI, p. 655. 

 ee. Antennal club usually conical, rarely compressed. 



Tribe VII. HYLESININI, p. 662. 



Tribe I. CRYPHALINI. 



Very small species, some less than 1 mm. in length. The pro- 

 notum is often armed with small teeth on the apical margin, 

 while the declivity of the elytra is sometimes provided with more 

 or less acute tubercles, but these characters are not constant 

 throughout the group, which includes principally the genera 

 Hypotlicnemus, Dryoccctes and Xyleboriis of LeConte. They are 

 known as ambrosia beetles, pinhole borers and timber beetles, and 

 are detrimental to crude forest products, wine and beer casks, and 

 other similar products. A number of twig beetles and many seed- 

 infesting insects, especially those of the date palm, are also in- 

 cluded. 



KEY TO EASTERN GENERA OF TRICE CRYPHALINI. 



rt. Antennal club compressed throughout or but slightly thickened at. 



base; antennal funicle with from 3 to 5 joints. 

 It. Elytra with scales, rarely with hairs; pronotum with apical margin 



armed. 



c. Elytral stria? and strial punctures distinct. 

 d. Antennal club with side margins evenly rounded. 



I. COSMODERES. 



dd. Antennal club with side margins sinuate. 



e. Funicle 3-jointed. II. TRISCHIDIAS. 



