CERAMBYCIDAE. 321 



Tribe VII.— iWESOSIJVI. 



This tribe has but a single representative, SynaplKvia Guexi, 

 in California; a rather large, stout insect clothed with gray 

 pubescence; antennie annulated, proihorax with two black vittai, 

 and elytra each with two angulated black bauils. 



The front is large and quadrate, labral sujjport large, coria- 

 ceous ; vertex deeply channelled; niuuth large, palpi slender, 

 pointed; eyes finely granulated, almost divided, lower lobe nearly 

 quadrate; antennae longer than the body in % , shorter in 9, 

 scape long with an oblique apical cicatrix; i)rotIiorax with a 

 very obtuse lateral tubercle just behind the middle; elytra wider 

 than thorax, nearly parallel, depressed on the back, suddenlv 

 inflexed at the sides, broadly rounded l)eliind. 



Front coxiB angulated, closed behind, with large trochantin; 

 middle coxal cavities open externally; raesosternum protuberant; 

 metasternuni a little longer than the 1st ventral; 2-4 segments 

 nearly equal, 5th in % somewhat emarginate, longer, channelled, 

 and more deeph^ emarginate in 9. Legs rather short, equal, 

 middle tibisE without tubercle or sinus on the outer margin ; tarsi 

 short, and broadly dilated, claws divergent. 



The species of this tribe resemble in appearance the stouter 

 forms of the next two tribes, but differ by the strongly angulated 

 front coxal cavities. 



Tribe VIII.— AC AXTHODEKIXI. 



With this tribe commences a long series of genera having the 

 claws divaricate; the front is large, quadrate, vertical, mouth 

 large; support of labrum large, coriaceous; palpi slender; anten- 

 nae variable, sometimes excessively long in both sexes, sometimes 

 (sub-tribe Acanthoderini) hardly longer than the body; vertex 

 not much excavated, eyes finely or somewhat coarsely granulated, 

 lower lobe nearly quadrate. Prothorax armed or not on the sides, 

 position of spine variable. Elytra rounded or truncate at tip, 

 usually flattened on the disk, rarely (Dectes) cylindrical. 



Front coxal cavities rounded, closed behind, usually by a broad 

 corneous space, sometimcis (Dectes) very narrowly, so as almost 

 to appear open. Middle coxal cavities closed externally; legs 

 moderate, thighs usually strongly clavate, middle tibiae with a 

 tubercle on the outer margin, hind tarsi sometimes short, some- 

 times elongated. 

 21 



