CERAMBYCID/E 319 



rugulose sculpture; tarsi smaller and less dilated; punctuation of the 

 sharply denned transverse areas of the male prosternum fine, extremely 

 dense and coalescent, with dull lustre, the patches rather narrowly sep- 

 arated, their inner margins moderately diverging antero-posteriorly. 

 Length (cf) 24.8 mm.; width 7.5 mm. Arizona (Baboquivari Mts.), 

 Snow. 



The various forms of the verticalis group represented in my col- 

 lection at the present time may be briefly outlined as follows, from 

 the male in every case: 



Basal joint of the antennae wholly black in the male, generally red basally 

 in the female 2 



Basal joint suffused with red basally in both sexes 3 



2 Under surface entirely dark red-brown in color; elytral punctures 

 small, dense, vermicularly coalescent; antennae slender, one-half 

 longer than the body; inner margins of the prosternal densely punc- 

 tate areas but feebly diverging antero-posteriorly. Length 24.8 mm. ; 

 width 7.5 mm. Arizona arizonicus Csy. 



Under surface wholly deep black, excepting a sharply defined median 

 area of the metasternum and the entire abdomen, which are dark 

 red; elytral punctures much coarser, everywhere well separated, 

 the two discal impunctate lines much better defined, the punctures 

 along their edges sparsely mingled with some that are a little coarser; 

 antennae notably stout, four-fifths longer than the body; densely 

 punctate areas of the prosternum with their inner margins very 

 rapidly and widely diverging antero-posteriorly. Length 27.0 mm.; 

 width 8.0 mm. Mexico (Guerrero), Baron. . . . *validicornis n. sp. 



3 Elytra relatively more elongate, with the sides sensibly more rapidly 

 converging from base to apex, strongly shining, the punctures rather 

 small, uniform throughout and widely separated, the impunctate 

 lines feebly defined and partially obliterated; coloration of the under 

 surface and nature of the prosternal patches nearly as in validicornis, 

 the antennae similarly long but not so thick basally, only a little 

 thicker than in arizonicus. Length 22.0-28.0 mm.; width 6.8-8.8 

 mm. Mexico (Iguala in Guerrero) *verticalis Serv. 



The females, of which I have exponents in validicornis and 

 verticalis, are sculptured as in the males on the upper surface and 

 are a little shorter and more parallel in form, the coloration of the 

 under surface rather more obscure and the antennae only about as 

 long as the body. The very dense sculpture of the elytra in ari- 

 zonicus is a striking differential character; in validicornis the punc- 

 tures are much less close, not at all confluent and about as sparse 

 as in verticalis but a little stronger. 



