and Central American Malachiidae and Melyridae. 117 



antennae moderately long, slender, feebly serrate, joints 5-10 sub- 

 triangular, about as long as broad, 5 larger than 6, 11 ovate, much 

 longer than 10. Prothoras small, transverse, the sides roimded 

 posteriorly and as seen from above sinuate and obliquely converging 

 anteriorly, the hind angles completely obsolete; finely punctate. 

 Elytra much wider than the prothorax, subparallel in their basal 

 half, conjointly rounded at the apex; densely, moderately coarsely 

 punctate throughout. Legs long and slender; tibiae narrow, 

 without definite spinules, the anterior pair sharply toothed at the 

 inner apical angle ; posterior tarsi elongate. 



$. Larger and broader, the antennae and tarsi infuscate towards 

 the tip. 



Length 3|-3J mm. 



Hab. Mexico {Truqui, in Mus. Brit., <^; Mus. Oxon., $). 



One male and two females. This species has the antennae 

 formed very much as in the male of L. cupreonitens and its 

 alhes, except that the apical joint is not so large, but is not 

 otherwise related to them. The tibiae are feebly setulose 

 (when viewed under the microscope), but there are no 

 definite spinules on their outer edge, and the insect, there- 

 fore, seems better placed in Listrus than in Trichochrous. 

 The relatively small, laterally compressed prothorax is 

 unusual in Listrus. 



5. Listrus crenicollis, n. sp. 

 Listrus, sp., Gorh., Biol. Centr.-Am., Coleopt. iii, 2, p. 329. 



^. Elongate, narrow, somewhat convex, shining; of a bright 

 brassy tint, the antennae and legs rufo-testaceous, the apical three 

 joints of the former and the tips of the tarsi infuscate; sparsely 

 pubescent, the marginal cilia of the elytra rather long. Head 

 sparsely, finely punctate ; antennae short, rather slender, joints 

 5-10 serrate, 5 triangular, larger than 6 or 8, 6-10 transverse, 9 

 and 10 broader than those preceding, 11 short-ovate. Prothorax 

 gibbous, nearly as long as broad, feebly rounded at the sides, 

 narrowed from about the middle, the margins closely, conspicuously 

 crenulate, the hind angles just traceable ; closely, finely punctate. 

 Elytra a little wider than the prothorax, subparallel in their basal 

 half, conjointly rounded at the apex ; closely and rather coarsely 

 punctured in their basal third, the puncturing thence to the apex 

 much finer and more diffuse. Legs rather slender, the posterior 

 tarsi elongate. 



Length 2|, breadth 1 mm. 



