OMOTOTUS. — IDMOSYNE. 447 



From all the closely allied forms contained in the genus Omototus the present species 

 may be separated principally by the small white elytral spots, which, although varying 

 in intensity, are always placed in three rows ; the intermediate spots of the first row 

 are not situated in a line with those at the sides but higher up ; and the middle spots 

 of the other two rows are equally displaced, generally one above and another below the 

 line. The general colour of the upper surface is a very dark brown, sometimes nearly 

 black. 



IDMOSYNE. 



Hydmosyne, Clark, Cat. of Halticidee, p. 172 (1860) ; Harold, Col. Hefte, xiii. p. 25 (1875). 

 Idmosyne, Gemm. & Harold, Cat. xii. p. 3542. 



The incrassate palpi, double-spurred posterior tibiae, and bifid claws are the generic 

 distinctive characters of Idmosyne. I refer two species from Nicaragua and the State 

 of Panama to this Tropical- American genus. 



1. Idmosyne clarki. (Tab. XXVI. fig. 8.) 



Fulvous • anterior tibige black ; thorax fulvous, closely granulate and finely pubescent ; elytra metallic blue, 

 thinly clothed with whitish pubescence, finely punctate-striate. 



Var. Head, antennae, and the four anterior legs black. 



Length 3-3J lines. 



Head rather strongly and closely punctured, black ; the frontal tubercles rugosely punctured, strongly raised, 

 transverse ; the labrum margined with testaceous, rather deeply punctate ; palpi robust ; antennae rather 

 long, filiform, the third and fourth joints nearly equal and the longest ; thorax more than twice as broad 

 as long, the sides subangulate before the middle, the anterior angles acute and each furnished with a single 

 hair the surface with an obsolete lateral depression at each side, closely granulate-punctate, reddish 

 fulvous ; scutellum testaceous ; elytra evidently depressed below the base, distinctly punctate-striate, 

 the punctuation distinct to the apices, of a light metallic blue or violaceous colour, clothed with thin 

 whitish pubescence, the interstices extremely finely punctured ; underside and the posterior legs fulvous, 

 the anterior legs black or their tibiae only of that colour ; posterior tibiae armed with a double spur ; claws 

 bifid. 

 Eab. Nicaeagua, Chontales (Belt) ; Panama, Volcan de Chiriqui (Champion). 



As I am unable to find any difference, beyond that of coloration, between the 

 specimens from the above localities, I think I do not err in referring all to one 

 species, which may be known by the granulate and opaque surface of the head and 

 thorax. In I. clarki the thorax is angulate at the sides, a character supposed to be 

 strange to the genus Idmosyne, but peculiar to Octogonotes; in the latter genus, 

 however, the claws are not bifid but appendiculate ; rather than establish another 

 genus I have placed the present insect in Idmosyne. 



2. Idmosyne panamensis. (Tab. XXVI. fig. 9.) 



Fulvous, pubescent ; head distinctly, the thorax extremely finely, punctured ; elytra metallic blue or green, 

 thinly clothed with whitish pubescence, finely punctate-striate. 



