124 MISCELLANEOUS FOHEST INSECTS. 



impression long, shallow, and nairow, and the strial punctures of the 

 elytra deep and coarse. 



There is considerable variation, more especialh^ in size, in the 

 acuteness of the posterior angles of the prothorax, in the convergence 

 of its side margins posteriorly, and in tlie elevati(m of the elytral 

 interspaces. 



Material examined. — A series of 60 specimens. The species is 

 distributed throughout the eastern United States. 



Lyctus suturalis Faldermann. 



Lyctus suturalis Faldermann, 1837, p. 225; Reitter, 1878, p. 196; Reitter, 1885, 



p. 99; Reitter, 1906, p. 423. 

 Lyctus deyrollei Tournier, 1874, p. 411. 



This species is related to linearis Goeze in prothoracic structure, 

 but is wholly different in elycral structure, resembling, in this respect, 

 ^j>?amcoZZisLeConte,t]iough quite different in that for the most part the 

 striae are made up of but a single row of exceedingly fine punctures. 



The specimens are quite constant in character, though there is 

 considerable variation in the prominence and roundness of the 

 anterior angles of the prothorax. 



Material examined. — A series of four specimens from Mr. Reitter. 

 The species occurs in the Caucasus. Up to the present time it has not 

 been recorded from the United States. 



Lyctus cavicollis Le Conte. 

 Lyctus cavicoUis Le Conte, 1866, p. 103; Casey, 1890, p. 324; Casey, 1891, p. 13. 



This species is very distinct, and is readily separated from the other 

 species by the shining, narrow, subquadrate, subconvex prothorax 

 with the sides parallel, the posterior angles sharply rectangular, and 

 the form generally stout. It is not closely allied to any other species. 

 It resembles lilaiiicoUis Le Conte in elytral structure, but the pro- 

 thorax is totally different. There is some variation in size, but the 

 structural details are quite constant. 



Material exaniined. — A series of 25 specimens, all from Calift)rnia. 



Lyctus planicollis I.,e Conte. 



Lyctus planicollis Le Conte, 1858, p. 74; Le Conte, 1866, p. 103; Duges, 1883, 



pp. 54-58; C5,sey, 1890, p. 324; Casey, 1891, p. 13. 

 {?)Lyctus carbonarius Waltl, 1832, p. 167. 



This species is extremely variable; perhaps more so tJian any others 

 of the genus. Individuals range in length from 2.5 to 5.5 mm. The 

 prothorax varies from broader than long, \\dth the side margins 

 strongly sinuate and convergent posteriorly, to subquadrate and the 

 sides parallel; it is, however, always as wide anteriorly as the elytra 

 at base, the anterior angles always rounded, the posterior never so. 



