632 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



MEGAMELtTS FUSCO-IRRORATUS Blanchard. 



Libumiafusco-irrorata'B-LK^CB.AKii, Berj;, Anal, do Soc. Cient. Argentina, vol. 12, 

 p. 266, 1881. 



MEGAMELUS FUSCO-TERMINATA Berg. 



Megavielus fuscoterminata Berg '79: 296. 



MEGAMELUS NIGRICULA Berg. 

 Megamelus nigricula Berg '79: 22G. 



MEGAMELUS PATRUELIS Berg. 



Megamelus patruelis Berg '7P: 22.1. 



MEGAMELUS UNIVITTATA Berg. 



Megamelus univittata Berg '79: 224. 



MEGAMELUS FUCATUS Berg. 



Euides fucata Berg, An. Soc. Cient. Argentina, vol. 16, 1883, p. 236. 



MEGAMELUS FUSCO-VITTATA Scott. 

 Euides fusco-vittata Scott '81: 155. — Berg, An. Soc. Cient. Argentina, vol. 16, 

 1883, p. 236. 



UNCERTAIN GENERA. 



The following genera I have been unable to include in the foregoing 

 synopses because of incomplete descriptions : 



Genus BERGIA Scott. 

 Scott in 1881 described tliis genus as follows: 



Head: Crown barely twice as long as broad, with a longitudinal central and two 

 short keels in front, the latter almost joined in the middle of the anterior margin; 

 face nearly equal in length to the width between antenna;, with two longitudinal 

 keels slightly widening from the lower margin of the frons to the apex; clj-peus about 

 aa long as broad, measiu-ed across the base, without a central longitudinal keel. 

 Antennae: First joint about half the length of second; eyes somewhat large. Pro- 

 notum with a central longitudinal and two side keels, posterior margin concave across 

 the scutellum. Scutellum triangular, apex acute, with five longitudinal keels, the 

 central one not reaching to the apex, and the side ones vanishing before reaching the 

 side margins. Elytra as in Cixius, Oliarus, etc., but the furcate apical areas are 

 longer than in these genera. Legs: Tibiae, third pair with three spines on outer 

 margin, nearly equidistant from each other, placed, one at the base, another before, 

 and another beyond the middle; tarsi, third pair, first joint almost as long as the 

 second. (Ent. Mon. Mag., vol. 18, 1881, p. 155.) 



According to Scott it is somewhat related to Ugyops St&l. 



BERGIA NIMBATA Berg. 



Libumia nimbata Berg '79: 22G. 

 Bergia nimbata Scott '81: 155. 

 Locality. — ^Buenos Ayres (Gunther). 



Genus IDIOSYSTATUS Berg. 

 Idiosystatus Berg, '84: 138. 

 This is apparently not distinct from Bergia. Berg separates it 

 only on the following characters : 



Body narrower; vertex longer and more triangular; frons broader; clypeus with a 

 median carina; antennae shorter. Carinas of pronotum and scutellum stronger; two 

 lateral carinse on scutellum on each side, united posteriorly. 



