CERAMBYCID/E 341 



Crossidius submetallicus n. sp.- More elongate and more convex than 

 either of the preceding and with the elytra not parallel but feebly cunei- 

 form, with the surface more declivous to the broadly rounded apices; 

 surface more shining, the dark areas of the elytra with greenish-metallic 

 lustre; vestiture pale, not dense, long on the head and prothorax, the 

 former black; antennae (cf) barely longer than the body, rather less 

 slender than in sayi but otherwise nearly similar; prothorax slightly 

 less transverse, the subparallel sides less rounded, red, with a large, 

 posteriorly bifurcate apical black area, extending slightly behind the 

 middle, the basal black margin anteriorly expanded along the middle, 

 leaving a sinuous red band separating the black areas, the punctures 

 strong and close, rather unequal in size; scutellar vestiture not so dense; 

 elytra with the strong and deep punctures only moderately coarse and 

 everywhere well separated; abdomen black, rufescent apically; pro- 

 sternum deep black, except on the flanks. Length (cf ) 12.7 mm.; width 

 3.5 mm. Colorado (Boulder Co.). 



Differs from the two preceding in the less parallel form, sub- 

 cuneate and submetallic elytra, which are less closely punctate 

 and in the black prosternum of the male, this being largely red in 

 sayi in both sexes. 



Tylosis Lee. 



The various modifications of this Sonoran genus resemble each 

 other so closely in their general physiognomy, that thus far no one 

 has attempted to define specific forms among them, excepting 

 LeConte, who many years ago named two or three, which were 

 subsequently suppressed by Dr. Horn. I find however, that this 

 action was without warrant, for the species are as well defined by 

 the male sexual characters as those of Batyle, and several other 

 genera, where the coloration or general habitus varies from species 

 to species within but very narrow limits, seeming thereby to indicate 

 an absence of specific differences. The species are all bright red, 

 rather shining, coarsely and closely punctate, more coarsely and 

 loosely toward base and more finely and densely toward apex of 

 the elytra, with the vestiture very short and sparse above but much 

 denser and rather conspicuous beneath, and all here defined have the 

 five black callous spots of the pronotum absolutely alike. The 

 general scheme of elytral ornamentation is also of the same order 

 throughout, but varies greatly in development from one sex or 

 species to another, though not so greatly as has been assumed among 

 individuals of the same sex of the same species. The male has the 

 elytral spots much less developed than the female as a rule. I seem 



