THE FAMILY LYCTID^. 125 



The pronotum may be densely, evenly punctured over the entire 

 surface, or have the punctures less dense and the surface polished 

 anteriorly, but is never scabrous; the median impression varies 

 from very deep and becoming broadly expanded anteriorly, wdth a 

 small circular impression at either side, to subobsolete in the smaller 

 specimens. 



Whether this species and carbonarius Waltl are synonymous the 

 author can not say, since he has not seen Waltl's description. How- 

 ever, he has 2 specimens which Mr. E. A. Schwarz tells him are 

 from Mexico, received through Dr. E. Duges from Guanajuato. 

 These specimens are probably from among the series on which Doctor 

 Duges based his ''Metamorphoses du Lyctus idanicollis." They 

 differ in some of the minor details from planicollis, more especially in 

 having the pronotal punctures coarser and less dense; and the median 

 impression is deep, oval, and not broadly expanded anteriorly. Should 

 these characters prove constant in a larger series they might well be 

 considered as representing a distinct species, probably carbonarius 

 Waltl, very closely allied to planicollis. 



Material examined. — A series of over 500 specimens. The species 



is found widely distributed throughout the entire United States 



at least. 



Lyctus parvtilus Casey. 



Lyctiis parruhis Casey, 1884, p. 175; Casey. 1890. p. 325; Casey, 1891, p. 13. 



This species is remarkably distinct and is separated at once from 

 the other species by the broad cordate prothorax and its dense, 

 coarse, subrugose punctation. 



There is great variation in size and to a less degree in the shape 

 of the prothorax and in the acuteness of the posterior angles. In 

 general form it resembles planicollis Le Conte, but in structural details 

 resembles opaculus Le Conte. It is readil}" separated from either, 

 and is far removed ' from linearis Goeze, with which species it has 

 very little in common. 



Material examined. — A series of about 50 specimens. Distributed 

 throughout the western and southwestern United States. 



Lyctus linearis (Goeze). 



Dermestes oblongiisfusciis, elytris striatis, Geoffroy, 1762, p. 103. 



Dermestes linearis Goeze, 1777, p. 148; Thunberg, 1784, p. 4, no. 4. 



Lyctus linearis (Goeze) Reitter, 1906, p. 423. 



Dermestes ohlongus (Olivier) Fourcroy, 1785, p. 19, no. 9. 



Ips oblonga Olivier, 1790, vol. 2. no. 18, sp. 8, pi. 1, fig. 5, a, b; 1792, p. 405, 



no. 9. 

 Lyctus oblongiis (Olivier) Latrcille, 1804, p. 241; Latreille, 1807, p. 16, sp. 1: 



Stephens, 1830, p. 117. 

 Dermestoidcs unipunctalus Horbst, 1783, p. 40, pi. 21, fig. H, h. 

 Bitoma unipunctata Herbst, J793, p. 26, pi. 46, fig. 3. 



