LONGITAESUS. 375 



6. Longitarsus nigricornis. 



Obscure dark fulvous ; antennae black, their second and third joints short ; thorax and elytra distinctly punc- 

 tured, the former transverse, the latter narrowly ovate and without humeral callus. 

 Length | line. 



Hab. Nicaragua, Chontales (Janson). 



The single specimen obtained at Chontales is of nearly similar shape to L. concinnus 

 and L. angusticollis, but differs from both in the black colour of the antennae ; from 

 the former also by the want of frontal tubercles, and by the absence of the impressed 

 short groove at the sides of the latter ; from L. angusticollis by the totally different 

 shape of the thorax, which is not narrowed posteriorly ; its punctuation and that of the 

 elytra is fine and visible only under a strong lens. 



7. Longitarsus colombicus. 



Longitarsus columbicus, Harold, Coleopt. Hefte, xv. 1876, p. 31 l . 

 Hab. Guatemala, near the city, Aceytuno (Champion). — Colombia, Bogota 1 . 



I cannot but refer the four specimens before me to the present species, or at the 

 utmost to a slight variety of the same ; the only difference I can find, according to the 

 description given by Von Harold, is in the sculpture of the thorax, which, in the 

 Guatemalan specimens, is finely, but distinctly, punctured, while Von Harold says that 

 the thorax is without distinct punctuation, but finely wrinkled longitudinally : this 

 difference would perhaps entitle us to look upon the Central- American specimens as 

 specifically distinct, especially as many species of the present genus can only be 

 distinguished by slight differences in structure or sculpture ; but I have one specimen 

 from the same locality in which the thorax shows a kind of intermediate degree 

 between punctures and wrinkles, and, moreover, as every other structural character 

 (as the length of the antennae and the comparative length of the joints, as well as the 

 punctuation of the elytra) agrees entirely with the author's description, I cannot but 

 believe these insects to be identical with L. colombicus. 



8. Longitarsus bogotanus. 



Longitarsus bogotanus, Harold, Coleopt. Hefte, xv. 1876, p. 32 \ 

 Hab. Guatemala, Aceytuno (Champion). — Colombia 1 . 



I must again refer a single specimen obtained by Mr. Champion to another of Von 

 Harold's species ; the antennae are shorter and much more robust than in the preceding 

 species, and the fifth to the terminal joints are stained with piceous ; the thorax is 

 extremely finely punctured at the posterior portion only, while the elytra are finely 

 and irregularly punctate ; the metatarsus of the hind legs is longer than half the length 



