CERAMBYCID^: 275 



constricted prothorax, with the base briefly subtubulate as in 

 Merium and Hylotrupes. The system of pronotal callosity re- 

 sembles somewhat that of Anocomis, but differs radically from 

 Hylotrupes. Hemicallidium amethystinnm has the elytra deep and 

 pure blue in color, with only the faintest violaceous lustre in certain 

 lights, the remainder of the body deep polished black; it seems to 

 be a rare insect, my single female example coming from North Fork, 

 Madera Co., California. 



Phymatodes Muls. 



The eyes in this genus are always very deeply emarginate and 

 sometimes divided, but there are so many intermediate stages that 

 but little use can be made of this character in classification; a 

 complete division is scarcely suggested in variabilis or in the obscurus 

 group, but is nearly complete in vulneratus and decussatus, virtually 

 complete in varius and entirely so in am&nus Say. The hind tarsi 

 however have divergencies of form which are available as subgeneric 

 criteria. There are scarcely any definite structural differences 

 between Callidium, as restricted by LeConte, and Phymatodes, aside 

 from general facies, where the distinction is very pronounced and 

 except perhaps in the more widely separated middle coxae of Cal- 

 lidium, but I find the deep transverse groove behind the frontal 

 margin of Callidium is only feebly or not at all developed here. 

 We might suggest the four following groups: 



Hind tarsi long and slender, the first joint equal to the entire remainder. 



Group I 



Hind tarsi slender but with the first joint, though very elongate, much 

 shorter than the remainder; elytra generally finely pubescent and 

 punctulate Group II 



Hind tarsi very small, the first joint not or scarcely more than twice 

 as long as wide 2 



2 Body narrower, more convex, the elytra bifasciate, very sparsely 

 punctulate; eyes not divided; middle coxae approximate, the meso- 

 sternal process narrow and very finely acuminate Group III 



Body less convex, generally broader, the elytra never fasciate nor 

 finely, densely pubescent, strongly punctate; eyes completely 

 divided in the typical species, undivided in others; middle coxa? 

 well separated, the mesosternal process broadly triangular.. Group IV 



Group II is rather heterogeneous but the others are fairly uniform 

 within themselves in general habitus, though variable in the eyes 

 as usual. 



