348 ME. M. JACOBT ON THE [Mar. 7, 



surface depressed at the middle ; elytra slightly wider at the 

 base than the thorax, rather flattened, the apex of each rounded : 

 underside black, more shining; legs fuhous, all the tibiae mucronate, 

 the first joint of the posterior tarsi longer than the following joints 

 together ; prosternum extremely narrow, the anterior coxal cavities 

 open ; posterior femora thickened ; the last abdominal segment of 

 the male deeply depressed ; anterior coxae very prominent. 



Hah. South Africa (my collection). 



The type of this genus was described by Weise from China, 

 and the present African species almost entirely resembles it, 

 except in the colour of the legs and its larger size, but I cannot 

 find any structural differences sufiicient to warrant its separation. 

 The genus seems to represent a transitionary form between the 

 Hcdticina' and Galerucince, since the whole general shape and the 

 almost indistinct prosternum resemble much more a species of 

 the latter family ,; but the distinctly dilated posterior femora leave 

 no doubt as to the real p>lace of the insect. 



Jambsonia Jac. 



This genus, originally described by me under the name of 

 Gabonia, but subsequently altered to Jamesonia, seems to me to be 

 identical with Weise's genus Thrymnes (Deutsche entom. Zeitsch. 

 1895). A renewed examination of other specimens since received 

 has proved to me that I have wrongly given the anterior coxal 

 cavities as closed ; the opposite is the case, the)^ are open. The 

 name of J. unicostata seems also applicable only to the female sex 

 of that species, as I have received lately a male specimen from 

 Dr. Kraatz, obtained at the Cameroons, in which the elytra are 

 without the transverse ridge near the apex : this specimen agrees, 

 however, in everytliing else with the female types, except in 

 having the entire head flavous. The species is evidently identical 

 with Thrymnes nucleus Weise. 



Jamesonia weisei, sp. n. 



riavous, the apical joints of the antennae and the posterior legs 

 black ; head impunotate, thorax with a few fine punctures ; elytra 

 scarcely more strongly punctured ; tarsi fuscous. 



Length 3 millim. 



Head impunctate, the eyes large, the frontal elevations and the 

 carina distinctly raised, labrum and mandibles piceous ; antennae 

 black, the lower three or four joints flavous, the second and third 

 joints small, equal, the fourth but slightly longer, the others more 

 elongate ; thorax nearly twice as broad as long, the sides slightly 

 rounded, the angles not pi'oduced, the posterior ones slightly 

 oblique, the surface nearly impunctate, shining, flavous ; scutellum 

 flavous, broader than long ; elytra wider than the thorax at the 

 base, slightly widened towards the middle, scarcely perceptibly 

 punctured, when seen under a strong lens ; below fla\ous, the 

 posterior legs piceous or black, tarsi more or less dai'k coloured. 



