582 FAMILY IV. SCOLYTIDJE. 



classification of the family. On account of the small size of the 

 insects, these organs are not, however, easy to observe accurately, 

 and more obvious characters are for that reason to be preferred. 

 In the keys which follow, based upon Technical Series No. 17, 

 Hopkins, 1915-b, greater prominence is given to the head, prono- 

 tum and tibiae. 



SYNOPSIS OF SUBFAMILIES OF SCOLYTID.E. 



a. Anterior tarsi with joint 1 longer than 2, 3 and 4 together. 



Subfamily I. PLATTPODIX.E, p. 582. 

 aa. Anterior tarsi with joint 1 shorter than 2, 3 and 4 together. 



6. Anterior tibiae with prominent process on the outer apical angle. 



Subfamily II. SCOLYTIN.E, p. 584. 



1)1). Anterior tibiae without prominent process on the outer apical angle. 



Subfamily III. IPIX.E, p. 592. 



Subfamily I. PLATYPODIN/E. 



I. PLATYPUS Herbst, 1793. (Gr., "broad" + "foot.") 



Form cylindrical; head large, wider than prothorax; elytra 

 perpendicularly declivous at base, striate, variously prolonged 

 into processes at tip. Found chiefly in the Southern States. 

 Three species appear to occur on the Atlantic coast, of which 

 one reaches New Jersey. A large number of species inhabit 

 tropical regions and are liable to be introduced in timber. 

 (Fig. 138; and Fig. 130, B, antenna; 139, L, tibia.) 



SYNOPSIS OF SPECIES OF PLATYPUS.* 



a. Ventral segments of male with elevations. 



1). Third ventral segment with elevations at posterior margin in 

 male; prothorax of female with two large discoidal punctures 

 each side of anterior extremity of short median line. 



901. FLAVICORXIS. 



bl). Fourth ventral segment with two very acute elevations at posterior 



margin in male. 902. 4-DEXTATUS. 



aa. Ventral segments without elevations; female with a smooth shining 



space each side of short median line. 903. COMPOSITUS. 



901 (9049). PLATYPUS FLAVICORXIS Fab., 1776, 212. 



Female elytra with third interval somewhat elevated and roughened 

 at base; posterior process of elytra shorter and less acute; declivity con- 

 cave near tip, tip truncate and feebly emarginate. Ventral segments fine- 

 ly rugose, regularly convex. Elytral process shorter and less prominent 

 (var. flisciponis Chap.) Male elytra with base of third interval less ele- 



*Fo11owing LeConte (1876, 343) with modifications based on Hopkins' description 

 of sexes (1894, 277). 



