DIABEOTICA. 565 



150. Diabrotica subsenea. 



Flavous, the head aeneous at the vertex ; thorax finely granulate, depressed at the sides, the disc spotted with 

 aeneous : elytra bronze-coloured, closely punctured, and obsoletely rugose. 



Var. Elytra testaceous, each with a longitudinal aeneous discoidal band. 



Length l|-2 lines. 



Head finely granulate, with a few fine punctures, greenish-aeneous at the vertex, testaceous at the lower portion ; 

 antennee nearly as long as the body, obscure fulvous or fuscous, the basal joints more or less testaceous, 

 the third joint more than twice the length of the second; thorax one half broader than long in the male, 

 twice as broad in the female, the sides with a more or less distinct fovea, the surface finely granulate and 

 punctured (more distinctly so in the female), testaceous, with a longitudinal central brownish or greenish- 

 seneous band not quite extending to either margin ; scutellum black ; elytra slightly widened posteriorly, 

 entirely bronze-coloured, closely punctured, the surface with some obscure and irregular depressions and 

 here and there transversely wrinkled ; legs and the underside testaceous. 



Hah. Costa Rica, Volcan de Irazu (Bogers); Panama, Volcan de Chiriqui (Cham- 

 pion). 



B. subamea differs from B. mystica and B. semiccerulea principally in the thorax being 

 finely granulate and with a central longitudinal band. Costa Eican specimens only differ 

 from those from Chiriqui in the colour of the elytra ; in the former the elytra may be 

 described as greenish-aeneous, margined with testaceous. 



151. Diabrotica smaragdina. (Tab. XXXII. fig. l.) 



Black, the antennas (the intermediate joints excepted), thorax, and legs flavous ; elytra bright metallic green, 

 with several deep impressions, the lateral and apical margins and the shoulders flavous. 



Length 2-2| lines. 



Head black, impunctate; antennas long and slender, flavous, joints 6-8 black, the third joint twice as long as 

 the second ; thorax narrowly transverse, more than twice as broad as long, the disc deeply transversely 

 depressed ; 'scutellum black ; elytra with a deep depression below the base and another (divided by a short 

 longitudinal costa) behind the middle, the disc finely and irregularly punctured, the apices impunctate, 

 the^surfaee of a bright emerald-green colour and very shining, the lateral margins narrowly and the apices 

 more broadly flavous, the flavous colour interrupted towards the base by a short green streak extending 

 upwards from the sides ; underside black, the legs flavous. 



Ilab. Panama, Volcan de Chiriqui (Champion). 



B. smaragdina may be known by the bright metallic green colour of the elytra, and 

 by the deep depressions on the latter being distinctly visible to the naked eye ; it is a 

 species of narrow and parallel shape. 



152. Diabrotica gemmula. (Tab. xxxil. fig. 7.) 



Ovate, convex, strongly dilated, metallic green ; head and thorax fulvous, the latter bi-impressed ; elytra closely 

 punctured, with two impressions, metallic green ; antennae and legs flavous. 



Length 4^ lines. ...... , . ,, 



Head impunctate ; antennas more than half the length of the body, entirely flavous, the third joint twice the 

 length of the second ; thorax about one half broader than long, impunctate, reddish-fulvous, the disc with 

 a transverse depression on each side, the sides straight at the base, rounded in front; scutellum fulvous; 

 elytra strongly dilated and convex, greatly deflexed at the posterior portion, with a depression below the 

 base and another at the sides below the shoulders, very closely and distinctly punctured, dark metallic 

 green ; underside dark metallic green, the legs flavous. 



