Noirril AIMKKKAN ( '< )l,EOPTKRA. 21 



he made suhordinaU' to anotlier. In all of our species with the an- 

 tenine and legs piceous-hlack, forming the group erratica of the 

 [)resent essay, the group of punctures is at best very indistinct, and 

 in many specimens entirely wanting, for which reasons it would be 

 very misleading to use this structure in a table before removing any 

 troublesome elements by other means. The color of the antenna* 

 and legs, although apparently trivial, is constant and unmistakable, 

 and separates sharply an otherwise troublesome series. 



In all the gi-oups which follow there can be no mistake when a 

 male is examined, the group of punctures may be indistinct, but is 

 always present. 



At the tip of the prosternum in all our species there is a marginal 

 line variable in distinctness. The point of the prosternum may be 

 entirely simple as in the inajority of the species ; in those of the 

 obesa gi\)up there are numerous punctures in the marginal line, vary- 

 ing from three to five on each side, each |)uncture bearing a short, 

 stiff bristle or seta, while in the species of the remotestriata group 

 there is but one seta each side. In looking for this character care 

 must be taken that the set^e on the trochanters do not lead to decep- 

 tion. 



In the remotestriata group the sides of the thorax are slightly de- 

 planate, likewise in the obesa group. The character is not very 

 striking, but when once appreciated, will enable the females of the 

 allied forms of different groups to be separated. 



At times great importance has been attached to the fovea* at the 

 base of the thorax, and the sculpture, whether punctured or not, but 

 these have been found to have very little value. 



In several species the two sexes differ notably in the character of 

 the surface, the males being smooth and shining, the females dull. 

 The scutellar stria varies in distinctness and extent. In many spe- 

 cies it arises at the base of the second stria, and joins, by its apex, 

 the first stria; in this case it is called entire. There are some species 

 in which the scutellar stria is practically always free at its apex, but 

 exceptions occur in both forms. In no Ce/ia in our series has there 

 been observed an ocellate fovea at the base of the scutellar stria as 

 is universal in Triama, and of frequent occurrence in Am<ini. 



In the majority of our species the under side of the body is smooth, 

 a small innnber have the sides of the metasteruum and the episterna 

 punctate, the punctures extending to the sides of the ventral seg- 

 ments. 



TKANS. AM. KNT. SOC. XIX. KKBKUAKV, l.^H-'. 



