568 PHYTOPHAGA. 



1. Elytra fulvous or testaceous, with lateral or apical pice ous markings. 



158. Diabrotica fusco-marginata. (Tab. XXXI. fig. 19.) 



Diabrotica fusco-marginata, Jac. P. Z. S. 1878, p. 149 1 . 



Hah. Costa Rica \ Rio Sucio, Volcan de Irazu (Rogers). 



Easily known by the thorax being piceous, margined with testaceous, and the elytra 

 dark fulvous, with a lateral longitudinal piceous stripe. 



159. Diabrotica waterhousei. (Tab. XXX. fig. 24.) 



Diabrotica waterhousei, Jac. P. Z. S. 1878, p. 993 \ 

 Hab. Costa Rica, Cache 1 (Rogers). 



The elytra are testaceous, with a distinct narrow black basal margin and a broader 

 piceous band (sometimes indistinct) at the apex. In general shape and colour this 

 insect greatly resembles certain varieties of Cerotoma denticomis, Oliv., from which the 

 open anterior coxal cavities distinguish it. 



160. Diabrotica maculata. (Tab. XXXIL fig. 11.) 



Head and the breast black ; thorax rufous, trifoveolate, finely punctured ; elytra fulvous, a broad lateral stripe, 

 the suture (widened at and beyond the middle), and a spot below the centre of each, black ; abdomen and 

 the femora fulvous. 



Length 4 lines. 



Head black, impunctate ; palpi flavous ; antennae black, the basal joint piceous, the ninth joint flavous (the rest 

 broken off), the third joint twice as long as the second ; thorax twice as broad as long, dark reddish, 

 shining, the disc remotely and finely punctured and with three small foveas placed triangularly ; scutellum 

 rufous ; elytra widened towards the middle, strongly but not very closely punctured, flavous, opaque, the 

 suture narrowly black, the black widening below the base into an oblique spot extending upwards and 

 below the middle into a lozenge-shaped mark, a broad black band of irregular shape extending from the 

 shoulder to beyond the middle, and a small spot below the middle between this band and the suture ; tibiae 

 and tarsi piceous. 



Hab. Costa Rica ( Van Patten). A single specimen. 



The following species belonging to Sect. 2 have been accidentally omitted : — 



161. Diabrotica nigropicta. 



Testaceous, the antennae, tibiae, and tarsi black ; thorax deeply bifoveolate ; elytra strongly semipunctate- 

 striate, the sides with two costae, a spot at the shoulder, another below the middle, and a sutural spot 

 below the base, black. 



Length 2 lines. 



Head impunctate, the extreme base black, the rest pale fulvous ; antennae two thirds the length of the body, 

 black, the basal and the apical two joints fulvous below, the third joint twice as long as the second ; 

 thorax twice as broad as long, impunctate, the disc with two deep oblique depressions ; scutellum black : 

 elytra flavous, the sides with two slightly curved costae from the shoulder to the middle, the rest of the 



