454 PHYTOPHAG-A. 



RHOICUS. 



Roicus, Clark, Cat. Halticidse, p. 22 (1860) . 

 Rhoicus, Gemm. & Harold, Cat. xii. p. 3535. 



This genus contains but a few species, of comparatively large size, characterized by 

 the filiform palpi, the rather long thorax, the sides of which are angulate before the 

 middle, and by the posterior tibiae being armed with a single spur only. Only a single 

 species (_&. sexmaculatus), from the Amazons, was known to Clark ; three others have 

 been since described. We now add three more from the State of Panama. 



1. Rhoicus unifasciatus. (Tab. XXVI. fig. 2.) 



Oblong, subdepressed, glabrous; tbe base of tbe head, the apical joints of the antenna, and the femora, testa- 

 ceous; thorax piceous, margined with testaceous; elytra very finely punctate-striate, piceous, a transverse 

 band before the middle, and the extreme apices, testaceous. 



Length 4 lines. 



Head elongate, rugose-punctate at the vertex, the extreme base of the latter and the clypeus piceous, the 

 middle portion and the labrum testaceous ; the frontal tubercles narrow and elongate, the carina very 

 acutely raised and long; antennas slender, scarcely half the length of the body, the two basal joints 

 piceous, the three or four following ones black, tbe rest testaceous, the third joint the longest, the fourth, 

 fifth, and sixth joints equal; thorax scarcely broader than long, the sides distinctly angulate before the 

 middle, the anterior angles slightly thickened and each furnished with a single hair, the surface trans- 

 versely depressed near the base, impunctate, the disc piceous, the margins testaceous ; elytra extremely 

 finely punctured, piceous, shining, a narrow transverse slightly oblique band (placed before the middle), 

 and the extreme apex, testaceous ; the breast, tibiae, and tarsi, black, the other portions of the under- 

 side, together with the femora and the upper sides of the posterior tibia), testaceous; the posterior femora 

 with a roundish black spot at their apices on the outer side. 



Hab. Panama, Bugaba {Champion). A single specimen. 



The claws in this as well as in the other species placed in Mhoicus are appendiculate. 

 Clark unfortunately describes all the claws as bifid, and speaks of an inner tooth when 

 each claw is divided or bifid, calling the base thickened when they are appendiculate; 

 as this may give cause for confusion, it may be as well to mention it here. 



2. Khoicus octomaculatus. (Tab. xxvi. fig. l.) 



Flavous, glabrous ; head, the seven lower joints of the antennas, the breast, and the tibia? and tarsi, black • 

 thorax impunctate ; elytra black, a spot at the base, a transverse band before and another below the 

 middle, and the apices, flavous. 



Length 3| lines. 



Head much longer than broad, the vertex closely and strongly punctured; the frontal tubercles united into an 

 elongate triangular elevation having at its middle a short fovea ; the carina raised into an acute ridge 

 extending to the end of tho clypeus; palpi filiform ; antennse half the length of the body, the seven lower 

 joints piceous, the rest flavous, the third joint the longest; thorax subquadrate, as long as broad the 

 sides slightly constricted below the middle, the surface obsoletely depressed near the anterior and the 

 posterior margins, of a flavous colour, shining and impunctate; scutellum black; elytra exceedingly 

 finely punctate-striate, black, each with a small spot at the base, a narrow transverse band (not 

 extending to either margin) before, and a similar band below, the middle, flavous, the apex with a 

 triangular flavous spot; femora and abdomen flavous, the breast black; posterior tibia armed with a 

 single spur. 



Hab. Panama, Volcan de Chiriqui (Champion). A single specimen. 



