CERAMBYCID^ 333 



Elytra without costse 2 



Elytra each with two pale costse 3 



2 Antennae very stout basally (cf) or throughout (9 ), abruptly slender 

 and strongly carinate beginning with the sixth joint in the former 

 sex, much compressed, more pubescent and simple in the latter; 

 elytra each with a discal densely pubescent vitta; body large. 

 [Type S. trilineatus Dup.]. Mexico *Sphaenothecus 



Antennae very slender throughout, filiform and non-carinate (cf), or 

 shorter and but little stouter ( 9 ) ; prothorax subconical, inflated 

 well behind the middle; elytra wholly devoid of pubescent discal 

 vitta, the apices bisinuato-truncate, the external angle sharply 

 spiniform; body much smaller. [Type Sphenothecus suturalis Lec.j. 

 Sonoran Plionoma 



3 Prothorax and antennae is in Plionoma; hind body more cuneiform; 

 scutellum not regularly elongate-triangular and densely pubescent 

 as in that genus, but sinuate at the sides or acutely produced at tip 

 and nearly nude. [Type Sphcenothecus btiittatus Dup.]. Texas. 



Taranomis 



Prothorax and antennae nearly as in Plionoma, the former inflated less 

 posteriorly, narrowed apically and with long erect flying hairs; 

 elytra broadly arcuate and unmodified at apex; mesosternum less 

 acutely transverse at the summit of the declivity; scutellum densely 

 pubescent, very acute; body beneath and legs with long flying hairs. 

 [Type P. vittatus Lee.]. Southern California Perarthrus 



Prothorax not conoidal but parallel, broadly angulate medially or some- 

 times tuberculate at the sides 4 



4 Antennae as in the preceding, very slender, non-carinate in the male; 

 scutellum acicularly produced at tip, nearly nude; elytral apices 

 bisinuously truncate, generally feebly bispinulose; second ventral 

 segment longer than the third; prothorax simply obtusely angulate 

 at the sides, without erect hairs. [Type Sphenothecus cyanicollis 

 Dup.]. Mexico *Lophalia 



Antennae gradually very stout basally, hirsute with short erect black 

 vestiture; scutellum nearly similar, not densely pubescent; prothorax 

 acutely tuberculate at the middle laterally, hirsute with erect black 

 pubescence; elytra similarly subcuneiform, with the apices similar; 

 second and fourth ventrals subequal and just visibly longer than the 

 third; lateral carina of the elytra not attaining the humeri. [Type 

 Z. spissicornis n. sp.]. Ecuador *Zalophia 



The last of these might seem to be allied to Eriphus, because of 

 the thoracic tubercles, but the prothorax is transverse, the elytral 

 tips bisinuously truncate, the legs short, with the femora all slender, 

 the posterior coming very far from attaining the elytral apices and 

 the hind tarsi are short and rather thick, with the first joint barely 

 as long as the next two. 



Sphcenothecus Dup., seems to be properly represented only by 

 tomentosus and trilineatus of Dupont; bivittatus, included by Lacor- 



