382 Coleopterological Notices, V. 



sible to accurately identify an isolated example of that sex. I have 

 consequently drawn all the characters of the following table and 

 subsequent descriptions from the male alone, when that sex could 

 be examined. 



In the Oxytelini true ocelli, such as characterize the Omalini, do 

 not exist, but in Oxytelus their place is taken by two strongly 

 setigerous punctures, occupying very nearly the same position at 

 the base of the vertex. I have not noticed these punctures in 

 Trogophloeus, nor in Aploderus, and they may possibly be pecu- 

 liar to Oxytelus. 



Most of the species are subai'ctic, but those in which the front is 

 spinose or spiculate in the male appear to be more partial to tropical 

 conditions, and are abundant in Central America. Those known 

 to me at present may be distinguished by the following char- 

 acters : — 



Eyes large in both sexes, the tempora subobsolete ; seventh ventral plate of 

 the male with two deep remote and parallel-sided fissures, the median 

 lobe truncate, not projecting beyond the lateral parts and with its edge 



slightly thickened in the middle SCUlptUS 



Eyes moderate, the tempora always large and well developed 2 



2 — Frontal margin armed in the male with a short stout acuminate or tri- 

 angular process 3 



Frontal margin not armed in the male 4 



3 — Frontal process simple and finely acute at apex ; head large, subquadrate ; 

 elytra longer than the prothorax. 

 Eyes at their own length from the basal angles ; elytra closely punctate ; 



mandibles arcuate insi^uitlis 



Eyes at much more than their own length from the basal angles ; elytra 

 more coarsely and sparsely punctate ; mandibles almost straight, arcuate 



at apex luunitus 



Frontal process notched at apex ; head smaller, strongly transverse. 



torcTiceps 

 4 — Male with the seventh ventral plate abruptly produced in the middle in 



the form of a flattened ligula. which is generally subtruncate at tip 5 



Male with the seventh ventral bisinuate or biemarginate at tip, the median 



lobe rounded or broadly angular, sometimes obsolete 10 



5 — Pronotum with three longitudinal impressed grooves 6 



Pronotum even, without longitudinal impressions 9 



6 — Vertex with two grooves convergent from the base COllTergeilS 



Vertex with the grooves parallel 7 



Vertex without impressed grooves 8 



7 — Sides of the prothorax sinuate near the basal angles, the latter more or 

 less prominent. 



