THE FAMILY LY(,TIDE. 125

The pronotum may be densely, evenly puncturedl over the entire surface, or have the punctures less denise and the surface polished anteriorly, but is never scabrous; the median impression varies from very deep and becoming broadly expanded anteriorly, wilth a small circular impression at either sidle, to subobsolete in I lie smaller specimens.
 Whether this species and carbonarius Waltl are synonymous the author can not say, since he has not seen Waltl's description. However, he has 2 specimens widch Mr. E. A. Schwarz tells him are
from Mexico, received through Dr. E. D)ughs from Guanajuat(o.
These specimens are probably from among the series on which Doctor Dughs based his "Metamorphoses du Lyctus planicollis." Tihey
differ in some of the minor details from planicollis, more especially in having the pronotal punctures coarser and less (lense; 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 parvulus Casey.
 Lyctus parrulus 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 readily 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 oblongusfuscus, 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 oblongus (Olivier) Fourcroy, 1785, p. 19, no. 9.
 Ips oblonga Olivier, 1790, vol. 2, no. 18, sp. 8, pl. 1, fig. 5, a, b; 1792, p. 405,
 no. 9.
 Lyctus oblongus (Olivier) Latreille, 1804, p). 241; Latreille, 1807, p. 16, sp. 1;
 Stephens, 1830, p. 117.
 Dermestoides unipunctatus Herbst, 1783, p. 40, pt. 21, fig. H, h.
 Bitoma unipunctata Herbst, 1793, p. 26, pl. 46, fig. 3.