546 PHYTOPHAGA. 



Closely allied to, but larger than, B. Usignata and possibly only a variety or the 

 female sex of that insect ; it differs as follow :— the thorax is less distinctly impressed ; 

 the spots of the elytra do not extend to either margin, and the posterior one is of more 

 rounded shape ; and the legs are black, with the exception of the base of the posterior 

 femora, this part being flavous. In all other respects the present insect agrees with the 

 preceding. 



100. Diabrotica subsignata. (Tab. xxxii. fig. 10.) 



Black; thorax and abdomen flavous, the former without depressions; the apical three joints of the antennae 

 testaceous ; elytra finely punctured, two spots at the base, a transverse band at the middle, and the apex 

 of each, yellowish. 



Length 2| lines. 



Head black ; the clypeus with a strongly raised central ridge ; antennae rather more than half the length of 

 the body, the third joint three times as long as the second, the three lower joints testaceous, the basal one 

 stained with piceous above, the following five joints black, the rest flavous, the extreme apex of the 

 terminal joint black; thorax one half broader than long, dark flavous, the surface rather convex, impunc- 

 tate and without depressions ; elytra finely and closely punctured, black, a small spot below the shoulder, 

 a larger oval one near the scutellum, a transverse band at the middle, and an irregular-shaped spot at the 

 apex, pale yellowish ; the breast and legs black, the extreme base of the femora fulvous, the abdomen 

 flavous. 



Hab. Panama, David in Chiriqui (Champion). A single specimen. 



B. subsignata resembles B. morosa, Jac, in the design of the elytra, but differs in 

 the structure of the antennae, and in the smooth, convex thorax. The black bands of 

 the elytra which divide and surround the flavous spots are narrow ; the posterior band 

 is widened laterally, and extends along the sides nearly to the apical black spot. 



101. Diabrotica cinctella. 



Diabrotica cinctella, Harold, Mittheil. Munch, ent. Ver. 1877, p. 110 *. 

 Var. Diabrotica puella, Baly, Journ. Linn. Soc, Zool. xix. p. 238 2 . 

 Var. Thorax with a black central longitudinal band or spot. 



Hab. Nicaragua, Chontales (Janson) ; Panama, Bugaba, Volcan de Chiriqui, David, 

 La Caldera, San Feliz, Pena Blanca (Champion). — Colombia 12 . 



I can only look upon B.puella as a variety of B. cinctella, although it perhaps 

 represents the normal form ; I have before me a great number of specimens of both 

 forms from numerous localities which show no other marks of distinction but that of 

 colour. In Von Harold's species the elytra are simply blackish, with a narrow lateral 

 and apical flavous margin ; in the variety there is a discoidal flavous spot on the middle 

 of each elytron and also an oblique short band near the apex. The elytra are either 

 finely or rather strongly punctured on the disc, the more or less distinct lateral longi- 

 tudinal groove very strongly so ; and the thorax is either entirely flavous, or has a more 

 or less distinct central black spot. Both forms agree entirely in structural details. I 

 have been enabled through the kindness of Mr. Baly to examine the type of B. puella ; 



