282 COLEOPTERA OF NORTH AMERICA. 



Spondylis upiformis extends from Alaska to Lake Superior. 

 Scaphinus sphsericollis is found in pine woods of the Southern 

 States. 



A near approach is said to be made by Spondylis to Asemum; 

 but while recognizing the resemblance, it appears to me to be a 

 very remote one, and I rather consider the present form to be 

 that which makes the closest approach to the next family, with- 

 out, however, actually belonging to it. 



Fam. lxiv.— cerambyctdae. 



Mentum variable, in Prionidae usually very transverse 

 and entirely corneous, in the others trapezoidal, more or 

 less .transverse, frequently coriaceous at tip; ligula mem- 

 branous or coriaceous, sometimes (Prionidae, a few Ceram- 

 bycidae, and Methiini of Lamiidoe) corneous; labial palpi 3- 

 jointed. 



Maxillae with two lobes, clothed at the tip with bristles, 

 the inner one obsolete in Prionidae. 



Mandibles variable in form, sometimes (Mallodon£, Den- 

 drobias %) very long; usually curved and acute at tip, 

 rarely emarginate, or chisel-shaped (Distenia). 



Eyes usually transverse, most frequently deeply emargi- 

 nate, often divided, in which case the upper lobe is some- 

 times wanting (Tillomorpha, Spalacopsis) ; either finely or 

 coarsely granulated. 



Antennae variable in position, either in front of or between 

 the eyes, in the latter case frequently on large frontal eleva- 

 tions; usually long and slender, imbricate in Prionus (pec- 

 tinate in some foreign genera), subserrate or compressed in 

 a few forms, with sensitive surfaces differing in the sub- 

 families and tribes; usualby 11-jointed, sometimes 12-25- 

 jointed (Prionus), very rarely 10-jointed (Methia, Dysphaga). 



Prothorax margined in Prionidae, not margined in any 

 others in our fauna; coxal cavities and coxae variable. 



Mesosternum short, side pieces most frequently attaining 

 the coxae; sometimes (certain Cerambycidae and Lamiidae) 

 cut off by the apposition of the sternal pieces. 



Metasternum moderate, or long, short only in apterous 

 Lamiae (Dorcadioides), and in some subterranean foreign 

 genera; episterna variable; in many Cerambycidae with 

 an opening for the duct of a scent gland near the inner 

 hrnd angle. 



