NORTH OF MEXICO. ; ! ; '>! 



sections. From the Scaurini this tribe may be distinguished bj the absence of spim 

 the vestiture of the tarsi, from the Amphidorini by the rather dense, long, coarse hairs 

 forming the vestiture in that tribe. The Ulomini are nearly all deprived of trochantin to 

 the middle coxa?, the third joinl of antennae usually short, the head deeply inserted in a 

 prothorax more deeplj emarginate in front. 



The tribe here defined has undoubtedly mor complex relationships and affinities than 

 are found in any other tribe. The genus Polypleurus point- strongly toward the Scaurini, 

 Tenebrio towards the Ulomini, Glyptotus in the direction of ETelops, and Xylopinus 

 (aenescens) toward the Strongyliini. A careful revision of the genera of the world would 

 undoubtedly cause an entire rearrangement of the genera, especially in those of the second 

 sub-tribe, and their apportionment in new tribes. 



Two sub-tribes are here recognised. 



Tarsi densely clothed with fine, short, silken pubi sceni e. I pes. 



Tarsi rather sparselj clothed with coarse pub brioxes. 



l-TRIBE I — UPES. 



The species of this group are all of moderate or large size, and are comprised in genera 

 taming but few species. Among the Upes we find genera varying greatly from the 

 typ •. showing strong affinities toward tribes of lower grades in their general organization. 

 These degradations of structure are- the more evident among the last lour genera, wh 

 the antenna? assume a form closely allied to that of Helops, while in two of the genera 

 the anterior tarsi are slightly though very distinctlj dilated in the male-. The pubes- 

 cence of the tarsi loses that line silken or velvet-like appearance and approximates that 

 seen among the species of the second sub-tribe. The mentum varies greatly in all the 

 genera, in some being flat and round, in others trilobed or convex at middle. The epi- 

 pleurae are usually abbreviated, in some lew genera entire. The metastemum is long or 

 short, in accordance with the presence or absence of wings. The hind coxa? are somi - 

 time- widely, usually narrowly, separated bj a triangular or oval intercoxal process. 



In accordance with the variations ol structure thus indicated briefly, our genera may 



lie tabulated a- follows ! 



Antenna' with the outer joint- transverse, perfoliate; last .i"i"t sub-quadrate, rounded at 



tip and larger than the preceding; antenna' shorter than tin' head and thorax. 

 Epipleurae entire. 



Epipleura? not narrower at apex. poltpleuri S. 



Epipleura? gradually narrowing to apex. 



Mentum with -mall lateral inflexed lob nyctobates. 



Mentum without lateral lobes. iphthimus. 



