﻿— 104 — 

 SYNOPSES OF CERAMBYCIDiE. 



BY CHARLKS W. LENG, B. S. 

 (CoiitinuL'd from p. gS, vol. vi.) 



ACM^OPS LeConte. 



In the preparation of the folio wing" table and notes I have re- 

 ceived much assistance from Dr. Geo. H. Horn; both in permission 

 to examine his sets of the variable species (twenty species, of sev- 

 eral of which no two are exactly alike), and by his experience as to 

 the characters which are trustworthy in separating such. And I am 

 indebted to Mr. Samuel Henshaw for numerous additions to the lists 

 of localities. It is to be noted in this connection that many Western 

 species which reach South to New Mexico, are there found among 

 the mountains where the elevation causes climatic influences similar 

 to their customary Northern habitat. 



This genus contains a number of species of moderate size, in 

 which the head is not at all, or only moderately constricted behind 

 in lisa. Dr. LeConte indicated three groups. The last, containing" 

 only pratensis, is abundantly distinct by the very long mouth and 

 front. The first has its characters most fully developed in bivittata, 

 viz.: a short, stout form, tarsi short and stout, the first joint scarcely 

 as long as the next two combined, short antenuct, the joints almost 

 serrate, and the third and fourth joints neither as long as the fifth. 

 The tarsal joints are densely clothed beneath with short pubescence, 

 which on each joint is equally dense. The second group contains 

 more slender species, the antennal joints longer and more slender, 

 and the tarsal joints longer (especially the first) and unequally clothed 

 beneath, most of the species having the dense pubescence confined to 

 the third joint. A. direda represents the group, except that the first 

 tarsal joint is abnormally long. This second group also contains 

 .those species which have a flattened thorax and most nearly resem- 

 ble Leptura. The form of the prothorax varies considerably, being 

 either decidedly angulated, or very indistinctly angulated, or rounded 

 on the disc. In discoidea and proteus it is strongly flattened and 

 channeled, with edges slightly prolonged and elevated each side. 

 Many of the species are liable to great variations in color, which 

 have been heretofore described as species, but are now- considered 

 unworthy to rank even as varieties, the various forms blending in- 

 sensibly into one another. Following" Dr. LeConte's paper, S. M. 

 C. No. 264, 1873, I ha\'e prepared this 



