DIABEOTICA. 521 



upon as the female of the same species do not differ in the pattern of the elytra, but 

 have simple and more elongate palpi and antennae. 



From D. fulvicomis the present insect may be known by its larger and more elon- 

 gate shape ; and by the elytra having a narrow sutural anterior line (instead of a 

 triangularly shaped spot), and a small (not elongate) spot at the shoulders, and the 

 posterior spots not elongate (as in D. fulvicomis), but rounded. 



43. Diabrotica semicirculata. 



Fulvous, the breast black ; thorax depressed on the disc ; elytra finely and moderately closely punctured, a 

 humeral and a sutural narrow stripe at the base, a spot below the base, and two spots (diverging 

 posteriorly) below the middle, blue. 



Length 2-2| lines. 



Hal. Panama, Bugaba, Caldera, Tole {Champion). 



This insect must also be separated from D. fulvicomis, D. palpalis, and others with 

 nearly similar elytral pattern. D. semicirculata is smaller than any of the allied forms, 

 and differs in having the head and antennse fulvous; the antennas have the third joint 

 one half longer than the second. The blue stripe at the shoulders of the elytra is 

 narrow and elongate and as long as the sutural one ; and the two posterior spots, 

 although separated, would, if connected, form a semicircular band, the inner one being 

 transversely and the outer one longitudinally directed. D. apicicornis has the antennas 

 differently coloured, the elytra without a spot near the base, and the tibiae black. 

 D. brevilineata differs in the same way, and also in the different position of the posterior 

 spots, these spots not diverging but running parallel to each other. In D. semicirculata 

 the antennas are shorter than in any of the allied species. 



44. Diabrotica brevilineata. (Tab. XXX. fig. 3.) 



Testaceous, the intermediate joints of the antennse and the breast black ; thorax obsoletely punctured, with 

 two depressions ; elytra very closely punctured, a narrow streak at the shoulder, the suture anteriorly, 

 and two small transversely placed spots below the middle, black. 



Length 3-3 \ lines. 



Eab. Panama, Bugaba {Champion). 



D. brevilineata differs from I). apicicornis in having the apical joints of the antennas 

 and the tibias entirely fulvous ; the thorax punctured ; and the elytra with extremely 

 thin black streaks, the streaks resembling those of D. fulvicomis, but of more elongate 

 shape, and in this respect approaching D. apicicornis. From D. semicirculata the 

 present insect differs in having the intermediate joints of the antennas black, and the 

 elytra without a spot before the middle. 



biol. cente.-amee., Coleopt., Vol. VI. Pt. 1, June 1887. 3 x 



