DIABROTICA. 541 



Closely allied to B. decorata, but differing as follows :— the head is without black 

 spots ; the thorax has only a few fine punctures, and is very deeply bifoveolate, and the 

 black spots are much larger (though placed as in B. decorata) ; and the black sutural 

 band of the elytra is gradually narrowed from the base to the apex. 



88. Diabrotica cerea. 



Black, the seventh and eighth joints of the antennae pale ; thorax flavous, bifoveolate ; elytra very finely and 

 rather closely punctured, flavous, each with a narrow sutural and a broad discoidal black vitta ; legs pale 

 flavous. 



Length 1^-2 lines. 



Bob. Guatemala, Coatepeque, San Isidro, Zapote {Champion). 



Amongst the small-banded species of this section B. cerea may be known by the 

 colour of the antennae, the three basal and the seventh and eighth joints being pale 

 testaceous, the same colour prevailing on the legs. The elytra are without costae, and 

 resemble those of B. granulata in their punctuation and in the width of the black 

 bands ; but in the last-named species the antennae are without pale joints and the legs 

 are strongly marked with black, while the general size is larger and broader; in 

 B. cerea the entire head is black and the frontal tubercles are distinct. B. medio-vittata 

 differs in the colour of the antennae and legs, and in the abbreviated pale flavous 

 subsutural vitta. The seven specimens before me show no differences of importance. 



89. Diabrotica nymphsea. 



Narrowly elongate, testaceous; antennae, tibiae, and tarsi, black; thorax fulvous, with two black bands; 

 elytra finely punctured, testaceous, each with a broad longitudinal black band not quite extending to 

 the apex. 



Length 2 lines. 



Head impunctate ; the frontal tubercles transverse, narrow ; antennae long and slender, obscure fuscous, the 

 basal joint more or less testaceous, the third joint very long ; thorax slightly broader than long, bifoveolate, 

 fulvous, with a longitudinal black band on each side ; elytra with the shoulders acute and ridge-like, 

 finely punctured, the black band occupying nearly the entire disc (slightly widened at the base, leaving 

 the sutural and lateral margins testaceous) but not quite extending to the apex ; legs black, the femora 

 testaceous at the base. 



Hal. Panama, Bugaba, Volcan de Chiriqui, Boquete, Caldera (Champion). 



The long and slender antennae (these organs being very nearly as long as the body), 

 the two black bands on the thorax, the shining upper surface, and the broad elytral 

 black bands are the chief characters of B. nymphwa. 



90. Diabrotica sex-lineata. (Tab. xxx. fig. 11.) 



Broadly ovate, piceous ; head and thorax fulvous, the latter bifoveolate and strongly punctured ; elytra rugose- 

 punctate, flavous, the suture, and three narrow longitudinal stripes on each, black; femora flavous. 



Length 3 lines. 



Head deeply foveolate, impunctate, the frontal tubercles small and rounded ; antennae more than halt the 

 length of the body, the third joint rather more than twice the length of the second, the three basal and 



