224 THE SCOLYTID BEETLES. 



The fact that specimens were collected in the wood indicates that 

 the food habits are similar to those of Crossotarsus lecontei, found m 

 the sapie log. 



The pupa is peculiar m the absence of caudal spines, the presence 

 of tergal and pleural hairs instead of tubercles, and the length of the 

 wing-pads, which extend to the apex of the abdomen. 



The larva, as shown by a dried specimen, appears to have the 

 posterior part of the body stouter, then narrowed toward the apex 

 of the abdomen. 



PRELIMINARY CLASSIFICATION OF THE SUPERFAMILY 



SCOLYTOIDEA. 



Key to the Families. 



(See PI. IX.) 



I. Anterior tarsi "witli joint 1 shorter than 2, 3, and 4 together. 



A. Anterior tibia without prominent process on the outer apical angle. 



Family Ipidse. 



B. Anterior tibia with prominent process on the outer apical angle. 



al. Anterior tibia without prominent rugosities on ventral area. 



Family Scolytidse. 

 a2. Anterior tibia with prominent rugosities on ventral area. 



Family Scolytoplatypodidse. 

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



C. Anterior tibia with prominent apical process and with rugosities on the 



ventral area Family Platypodidse. 



Family IPID.ffi. 



Key to the Subfamilies. 



(See Pis. X, XI, XIII, XIV.) 



I. Pronotum with anterior dorsal area commonly rugose; head concealed from above; 

 anterior tarsi with joint 3 simple. 

 A. Abdominal sternites 5-7 not strongly ascending. 



al . Anterior tibia broader toward apex or serrate on outer margin, 

 bl. Abdominal sternite 7 with posterior margin always rounded. 



1. Subfamily Cryphalinse. 

 b2. Abdominal sternite 7 with posterior margin rarely rounded. 



cl. Pronotum and elytra clothed with scales orhaii's, very rarely 



glabrous 2. Subfamily Ipinae. 



c2. Pronotum and elytra without scales, commonly glabrous or 



sparsely pubescent 3. Subfamily Corthylinae. 



a2. Anterior tibia not distinctly broader toward apex or not serrate on 

 outer margin. 

 b3. Anterior tibia not strongly narrowed toward apex, apical tooth 

 stout; antennal club compressed ; elytra with scales. 



4. Subfamily Micracinse. 

 b4. Anterior tibia strongly nan-owed toward apex, apical tooth small; 

 antennal club thickened at base, with anterior face obliquely trun- 

 cate; elytra with hairs 5. Subfamily Webbinse. 



B. Abdominal sternites 5-7 strongly ascending; tibia broadly compressed, outer 

 margin serrate 6. Subfamily Xyloctoninse. 



