348 MEMOIRS ON THE COLEOPTERA 



2 Antennae with joints three to six or seven truly spinose externally at 

 apex 3 



Antennal joints not spinose at apex, though sometimes very acutely 

 angulate or subspinulose 4 



3 Prothorax not modified at base, evenly rounding at the sides to the 

 basal constriction, the pronotum biimpressed; antennae long; elytra 

 intricately maculate with pubescent lines, many of which are longi- 

 tudinal. [Type Clytus hartwegi White] Tylcus 



Prothorax abruptly declivous laterally at base as in Cyllene, the pronotum 

 differing in being solidly and densely 'clothed with short pubescence, 

 never banded; antennae long and notably heavy; elytra carinulate 

 subsuturally, with irregular transverse bands and finer lines of pale 

 pubescence, very acutely unispinose at tip; coxae widely separated, 

 the prosternal process flat, abruptly vertical behind, the mesosternum 

 very steeply but convexly declivous; met-episterna broad; basal 

 joint of the hind tarsi long, rather compressed. [Type Clytus an- 

 tennatus White] Megacyllene 



4 Prosternum flat, broad between the coxae, the posterior edge promi- 

 nent, the posterior wall vertical or even concave; prothorax abruptly 

 declivous at base laterally and with transversely pubescent bands; 

 elytra carinate subsuturally, except basally, transversely fasciate 

 or spotted with dense pale pubescence, the apices angulate or acute; 

 coxae widely separated, the mesosternum vertical or inclined; met- 

 episterna and tarsi as in the preceding, the antennae moderately 

 long, much more slender. [Type C. signifera Newm.] .... Cyllene 



Prosternum horizontal or nearly so but very narrow between the coxae; 

 mesosternum broadly, evenly sloping 5 



Prosternum wider between the coxae and gradually sloping posteriorly; 

 mesosternum also gradually sloping 6 



5 Head transversely subprominent between the antennae, thence sloping 

 very steeply to the frontal margin, the antennae slender throughout, 

 cylindric, moderately long, the third joint longer than the fourth 

 and very nearly as long as the fifth; prothorax evenly rounded at the 

 sides, more narrowed basally, the sides slightly sinuate at base; 

 scutellum broad, rounded, well developed; elytra as in Cyllene, 

 except that the subsutural carina is obsolete or barely traceable 

 and the finer transverse lines of cinereous pubescence more irregular, 

 with a short longitudinal bifid line near the suture at apex, which 

 never appears in Cyllene; legs shorter than in that genus. [Type 

 C. fulminans Fabr.] Arhopalus 



Head nearly as in Arhopalus but more abbreviated in front of the antennae, 

 the latter shorter, more compact and slightly thickened distally; 

 prothorax and scutellum similar, the former relatively less de- 

 veloped; elytra as in Cyllene, the carina similarly very distinct; 

 mesosternum generally unmodified but sometimes with a subtuber- 

 culate median longitudinal carina; legs only moderate in length, 

 slender, the basal joint of the hind tarsi not longer than the entire 

 remainder; body very densely ochreo-pubescent, the elytra irregu- 

 larly and transversely variegated. [Type 0. citrinus Chev.]. 



*Ochraethes 



