Coleopterological Notices. 113 



the suture is very finely beaded, the bead becoming' obsolete before 

 attaining- the base. The scutellum is small, and the elytra are 

 rendered feebly opalescent by an excessively minute transverse 

 strigilation, which is just resolvable under a power of 80. The 

 punctures are small, feebly crescentiform and disposed in rather 

 approximate but not very regular rows, becoming wider and more 

 confused near the sides. 



The description is taken from the typical Central American E. 

 estriatus Sharp, one of the largest and finest species of the family. 



The affinities of Eulitrus are evidently strongly toward Olibrus, 

 and it bears very much the same relation to that genus that Acylo- 

 mus bears to Stilbus. ' The feeble dilatation of the mesosternum 

 behind the middle acetabula, shows also that it should form one of 

 a series joining Olibrus and Acylomus or Stilbus. No species has 

 yet been discovered within the United States. 



LITOLIBRUS Sharp. 



The nearest ally to this genus is probably Acylomus, from which 

 it difl'ers primarily in four important characters as follows : — 



1. The mesosternum is not produced at all behind the middle 

 acetabula, being reduced to a simple fine bead forming the margin 

 of the cavity, as in Olibrus. 



2. The metasternal process is very narrow and much shorter. 



3. The sexual modification of the posterior tibise, tibial spurs, and 

 tarsi does not apparently exist, and the second joint in the male is 

 not spongiose beneath. 



4. The basal joint of the posterior tarsi is extremely obliquely 

 truncate at apex, and extends more or less beneath the second joint, 

 this being more noticeable in the northern forms than in the typical 

 obesiis where, however, it is also very marked. In Acylomus the 

 apex of the first joint is only slightly oblique, and its lower surface 

 does not extend at all beneath the second. In both genera the 

 connection between these joints is rigid, apparently admitting of 

 but little, if any motion, but the line of demarcation is rather 

 stronger in Litolibrus than in Acylomus. 



Both of the genera here compared differ greatly from Stilbus in 

 the very elongate second joint, and Litolibrus differs from Acylomus 

 as well as Stilbus in its extremely robust legs, especially the middle 

 and posterior femora and tibiae. 



This genus is one of the most distinct of the family, ranking-, in 

 Annals N. Y. Acad. Sci., V, Feb. 1890.— 8 



