DIABEOTICA. 525 



Hal. Mexico, Guanajuato, Yolos, Juquila (Salle), Jalapa, Chilpancingo (Edge). 



A very distinct species, apparently allied to D. interrupts Baly, from which it differs 

 in the colour of the antenna?, underside, and legs, and in the spotted and punctured 

 thorax. In general shape D. unilineata is somewhat flattened and widened posteriorly. 



53. Diabrotica trilineata. (Tab. XXX. fig. 13.) 



Flavous, the upper part of the head, the intermediate joints of the antennae, the breast, the upper edge of the 

 femora, and the tibiae black ; thorax bifoveolate ; elytra closely punctured, the suture and a submarginal 

 stripe black. 



Length 3 lines. 



The lower part of the face flavous, the vertex black : antennae piceous, the lower edge of the basal joints 

 flavous, the terminal joints obscure fulvous, the third joint nearly twice the length of the second ; thorax 

 about one half broader than long, the disc finely punctured and with two deep impressions ; scutellum 

 black ; elytra rather convex and parallel, closely and distinctly punctured, the sutural and submarginal 

 stripes broader than in D. unilineata ; the sides of the breast black ; the legs flavous beneath, black above, 

 the tarsi black. 



Hab. Guatemala, Capetillo, Duenas (Champion). 



D. trilineata is larger, and more convex and parallel, than D. unilineata. The head 

 black at the base ; the antennae and the underside and legs differently coloured ; and 

 the elytral stripes are broader, but otherwise similar in shape and position. D. inter- 

 rujpta, Baly, seems closely allied ; but is described as having the second and third joints 

 of the antennae short and equal, and the last abdominal segment black. 



j. Elytra testaceous, narrowly margined with black. 



54. Diabrotica hogei. (Tab. xxx. fig. 12, var.) 



Head, the intermediate joints of the antenna?, the breast, tibiae, and tarsi, black ; thorax bifoveolate, black, the 

 sides and a central band flavous ; elytra finely punctured, testaceous, narrowly margined with black. 



Var. Thorax entirely testaceous. 



Length 3 lines. 



Head impunctate, the frontal tubercles very obsolete and divided by a deep groove, the carina acutely raised ; 

 antennas about half the length of the body, the third joint one half longer than the second, the three lower 

 joints fulvous*, the five following black, the ninth and tenth joints testaceous, the apex of the terminal 

 one black ; thorax subquadrate in the male, slightly broader in the female, the surface not visibly punc- 

 tured but with a small more or less distinct fovea on each side, in colour piceous or black, with the 

 lateral margins narrowly and a longitudinal central band flavous ; scutellum black ; elytra nearly parallel, 

 very finely and moderately closely punctured, flavous or testaceous, with all the margins narrowly, and the 

 apices a little more broadly, black ; breast black, the abdomen and the femora testaceous. 



Ilab. Mexico, Jalapa (Hbge). 



I do not think I err in treating the specimens described above with a uniformly- 

 coloured testaceous thorax as varieties of D. hogei, as they agree closely with the typical 

 form ; they have, however, the elytra more narrowly margined with black. 



* In one specimen the basal joint is whitish and the two following joints stained with piceous. 



