TRIEKEABDA. 487 



5. Trirrhabda mexicana. (Tab. xxvil. fig. 21.) 



Testaceous; head with one, the thorax with three blackish spots, finely rugose ; elytra rugose-punctate, green, 

 finely pubescent, each with two narrow longitudinal testaceous stripes. 



Var. Elytra fuscous instead of green. 



Length 4-4| lines. 



Head finely rugose, a large round spot on the vertex and the labrum piceous or fuscous ; antennae rather more 

 than half the length of the body, dark fuscous, the third and fourth joints slender, equal, the following 

 ones slightly shorter ; thorax three times as broad as long, the sides rounded at the middle, the posterior 

 margin Binuate near the angles, the surface with a shallow depression at the sides and another longitu- 

 dinal one at the middle, closely rugose-punctate, a large spot occupying nearly the entire sides, and 

 another central one of variable shape, fuscous ; elytra slightly widened behind, more strongly rugosely 

 punctured than the thorax, covered with short greyish pubescence, the green portion interrupted by two 

 narrow longitudinal testaceous stripes, which, commencing at the middle of the base and running parallel 

 to each other, are joined at a little distance from the apex of each elytron ; the underside and the femora 

 testaceous ; the knees, tibia?, and tarsi fuscous ; the first joint of the posterior tarsi as long as the three 

 following joints together ; claws bifid. 



Eab. Mexico, Panistlahuaca {Salle), Cerro de Plumas {Edge). 



In the variety from Panistlahuaca, the green portion of the slightly metallic elytra 

 is replaced by a purplish-fuscous tint. 



6. Trirrhabda dilatipennis. 



Black j head and thorax testaceous, the former with one, the latter with three spots ; elytra widened behind, 



finely coriaceous and pubescent, fuscous, the extreme lateral and sutural margins, as well as two 



longitudinal narrow stripes on each, testaceous. 

 Length 3£ lines. 

 Antenna; black, the third and fourth joints equal, the following ones slightly shorter ; thorax two and a half 



times broader than long, very finely rugose ; elytra wider than the thorax at the base, much dilated 



posteriorly, thinly clothed with yellowish pubescence. 



Eab. Panama, Volcan de Chiriqui (Champion). 



There is only a single specimen, and that evidently a female, before me. The much 

 narrower thorax, the sides of which are slightly angulate at the middle, the black 

 antenna?, scutellum, and legs, and the different shape of the elytra, will prevent 

 T. dilatipennis being mistaken for T. obscuro-vittata ; the elytra, instead of having 

 three testaceous stripes on each, as in T. obscuro-vittata, have only two in the present 

 insect, in which also the lateral margins are distinctly raised, though the rest of the 

 surface is smooth and finely coriaceous. 



7. Trirrhabda (?) modesta. (Tab. XXVIL fig. 20.) 



Elongate, parallel, obscure fuscous, finely pubescent ; antennae, three spots on the closely punctured thorax, 

 and the tibia? and tarsi black ; elytra very finely rugose-punctate. 



Length 4 lines. 



Head finely rugose, the upper part obscure fuscous, the lower part testaceous ; the apices of the mandibles and 

 the palpi piceous ; antenna? more than half the length of the body, black, the fourth joint longer than the 

 preceding and the foUowing joints ; thorax rather more than twice as broad as long, the sides rounded at 

 the middle, the angles tuberculiform, the surface obsoletely impressed at either side, closely rugose and 

 punctured, with three obscure black spots placed transversely; elytra very closely and finely rugosely 

 punctured, covered with short and close greyish pubescence. 



