1905.] OP PHYTOPHAGOUS COLEOPTERA. 441 



Oedioxychis illigeki, sp. U. 



Piceons ; thorax flavous, anterior angles not mucronate ; elytra 

 closely punctured, flavous, a transverse band at the base, emar- 

 ginate \yitliin tlie shoulders, a narrower band below the middle, 

 and a triangular spot near the apex, dark fulvous or piceous. 



Var. The posterior elytral markings joined. 



Length 5-6 millim. 



Of short and ovately rounded shape ; the head with some deep 

 punctures near the eyes, the vertex piceous, clypeus flavous, eyes 

 well separated, frontal tubercles oblique, i-ather short ; antennte 

 short, fulvous or black, the third, foui-th, and fifth joints equal ; 

 thoi'ax strongly transverse, moi'e than twice as broad as long, the 

 sides broadly sulcate, rounded in fi-ont, the anterior angles not 

 mucronate but thickened, the surface impunctate, flavous ; elytra 

 finely and closely punctured, with three transverse dark fulvous 

 bands — the first at the base, nearly extending to the middle and 

 notched at its anterior mai-gin within the shoulders, the second 

 narrower band below the middle and immediately followed by a 

 triangular spot ; neither of the bands extends to the lateral or 

 sutural margins, and they ai-e sometimes tinged with an ?eneous 

 gloss ; metatarsus very short, claw-joint strongly swollen. 



Hab. Trinidad. 



I possess four specimens of this species, which is of rather 

 small size, and may be known by the shape of the anterior elytral 

 band, which in all cases is notched at the base, and by the 

 position of the posterior bands, which sometimes form but a 

 single broad one. 



Oedionychis dissepta Erichs. 



This is evidently a very variable species in size as well as in 

 the markings of the elytra. Erichson has described two varieties, 

 but I have before me others. In the type the elytra have a 

 broad transverse, nearly black band at the base and another one 

 near the apex ; this latter band is often reduced to an oval spot, 

 or may be absent altogether ; in another form which I received 

 from Marcapata, Peru, together with typical specimens, the 

 thorax has two blackish spots at the middle ; then there is a 

 third variety, in which the bands are very much broader and 

 only separated by a very nari"ow transverse flavous band at the 

 middle. No other structural diflferences are visible, in spite of a 

 very careful examination, nor do the male genitalia of these 

 varieties show any difference whatever. In all the specimens the 

 cljrpeus, thorax, and the lateral elytral margins remain flavous, 

 the punctuation is extremely fine, the sides of the thorax are 

 nearly straight and are produced anterioi'ly into a small tooth. 

 0. signifera Baly and 0. 5-maculata Jac, likewise from Peru and 

 Bolivia, seem to be nothing but other varieties in which the 

 elytral markings are reduced to spots ; they cannot otherwise be 



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