120 GEO. H. HORN, M. D. 



The remaining species are quite homogeneous in their relationship 

 and present little of note beyond the ordinary specific diiferences. 

 They divide naturally into two unequal sets by the sculpture and 

 ornamentation of the surface of the elytra. The larger number have 

 the elytra more or less roughened with acute asperities or smaller 

 tubercles which bear at their summits groups of short, black, scale- 

 like hairs very nearly erect, while three of the species have no 

 tubercles and no scale-like hairs. 



The antennae are longer than the body in both sexes in all the 

 species except aculifer and macula, in these the third joint of the 

 antenna is very plainly longer than the fourth, while in all the other 

 species the difference between these two joints is very small. The 

 sexual character observed in the males of aculifer and planidorsus has 

 not been noticed in any other species. 



No changes in synonymy are proposed except that interruptus Hald. 

 is collaris and not macula. 



I think there is very little doubt that Say's Lamia sexguttata 

 (Journ. Acad, v, 1825, p. 269), is the same as comniixfus Hald. 



Uxocentrus hiustus Chev., Ann. Ent. Soc. Fr. 1862, p. 249, for 

 which that author quotes Leptost. hiustus Lee. as a synonym, is 

 probably not the same species. 



L. fascicularis Harris, Trans. Bost. Soc. Nat. Hist, i, 1836, p. 88, 

 pi. 1, fig. 9, placed under Leptostylus in the " Catalogus," is Liopus 

 xanthoxyli Shimer. 



Reduced to tabular form these sections are as follows : 



Elytra with asperities or tubercles bearing at their summits short, black, scale- 

 like hairs Section A. 



Elytra without asperities and scale-like hairs Section B. 



The latter being the smaller section the species will be first con- 

 sidered. They form the nearest approach to Liopus. The numbers 

 give what seems a proper cabinet arrangement. 



Presternum as wide between the coxse as the width of a coxal cavity. Elytra 



obliquely truncate at tip 13. macula Say. 



Prosternum narrower than a coxal cavity. Tips of elytra separately rounded. 

 Thorax sparsely punctured, the flanks at middle without punctures. 



12. perplexus Hald. 



Thorax moderately densely punctured, the flanks as densely punctured as 



the disc 11. collaris Hald. 



Section A contains a larger number of species which are also more 

 troublesome to separate in a tabular form; in their arrangement not 

 only the size but also the roughness of sculpture has been held in 



