(»TI(»UHYN('IIJJ).K — I'KOMECOIMM. Gl 



iniii^liiit; uf parts. Tlic licad, liowcvcr, is rather lar<i-<; ami the eves ratlier 

 larfTc, firciilai-, |piiHiiiiiciil. ami well s('|)arate(l from tlic tlmrax: lifa<l, Itcak, 

 ami lliii|-:i\ all cinialK ^rainilatcil. 'i'horax ex lindiical, as lojij;" as Iuli'Ii. 

 i]l\ tra iVoiii two ti> tlircc tiiiics as ItiiiL;- as Krnail. \(T\ i-cL;iilarl\ ami iini- 

 tiii'iiiK arrlic(| witli (listiml and sliai'[i stria' \\liicli ai'c plainh nearer eacii 

 dtlier at tlic l)ase tliaii in tlie middle nt" tlie eh tra, with small, distinct, and 

 deep cirrular >>i slightly ehmyated punctures separated by ainmt their nun 

 diaiiiet( T, hiokini;- on the reverse like l)ea<ls on the wires of an aliacus. 



Length of head and thorax, 1-5"""; of elytra, •_'""": height of body in 

 middle of elytra, 1""". 



White river, western ("olorado, from the uppei- half of (Janyon biitte. 

 Oiu; specimen, No. 58(1, U. S. Geolofi'ical Survey. 



Tribe PROMECOPINI. 



Kxcepting a Eiidiagog'U.s wdiicli occurs in the (iosiute fauna, all the 

 other mcmliers of this tribe in the American 'I'ertiaries are c(inline(l to 

 Florissant; they are but three in number, but ilie\ liehmg to two distinct 

 genera, both of which are extinct. 



1 have placeil in this tribe several species which seem nearl\- allied 

 ami which tiom the \isible structure of the mesothoi-acic- epimera of somt^ 

 ot them ajppear to fall in the s('cond division of the family- The e^ fs bi'ii\g 

 transverse and the ocular lobes very large indicate that tliev fall in the 

 present tribe, a .strictly American grouj), all the living members of which, 

 according to Lacordaii-e, are of small size, and as far as their general ap- 

 pearance goes, very homogeneou.s. Some of the forms jilaced hei'e are, 

 however, far more robust than the living types and of cousideralil \ larger 

 size than the largest of them. 



Table of the (/eiiera of Promecojtini. 



i;<«iy sidiit, nut iiiuif tliaii twice ii.s long as liroail. 



Kostniiii relatively slender, eyes as bread as rostnun; so<-nnd abdominal si'{;ment 



longer than the two following Kudoniuii. 



Kostrnni relatively broad; eyes narrower than rostrum ; second al>doniinal seg- 



iMciiI nut longer t lia 11 I lie lun Inllnwing lJiirriii)lH.s. 



Body slender, miuh more llian twice a-s lung as l)road lJi«liaijo(ju«. 



