44 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



somelidae, such as Trirhdbda. A closely related species with similar 

 discoidal marking, D. marginipennis SufFrian, occurs in the West 

 Indies, and in Mexico are tAvo species, D. subaenea Jacoby and D. 

 sallaei Jacoby, resembling discoidea in color pattern. All three are 

 easily separable by other characters. D. dorsata Jacoby, also from 

 Mexico and Central America, in its paler form has a discoidal spot, 

 but it is not at all closely related to discoidea, but rather to glabrata. 



DISONYCHA DISCOIDEA var. ABBREVIATA Melsheimer 



Plate 5, Figuee 24 



Disonycha abbreviata Melbuehier Proc. Acad. Nat. Sci. Philadelphia, vol. 3, 



p. 163, 1847 (Pennsylvania; tyi>e in Melsheimer collection, Mus. Comp. 



Zool.).— HoBN, Trans. Amer. Ent. See, vol. 16, p. 207, 1889. 

 Disonycha abbrevita (sic) Ckotch, Proc. Acad. Nat. Sci. Philadelphia, vol. 25, 



p. 64, 1873. 

 Disonycha discoidea var. abbreviata Schaeffee, Journ. New York Ent. See, 



vol. 27, p. 33, 1919. 



Description. — Of same size, sculpture, and coloring as discoidea., 

 but with a sutural and a median vitta on each elytron instead of a 

 black, discoidal spot, these vittae not reaching apex. 



Type locality. — Pennsylvania. 



Distrihution. — District of Columbia; Maryland (Cabin John, 

 Plummers Island) ; Virginia (Nelson County, Falls Church) ; Ken- 

 tucky (" near Cincinnati, Ohio ") ; Kansas (Topeka) ; Illinois 

 (Bloomington) ; Indiana (Edwardsville). 



RcTnarJcs. — Schaeffer, having examined specimens showing an in- 

 tergradation in color, has suggested that abbreviata and discoidea 

 may be color varieties of the same species, and this suspicion 

 apparently is confirmed by examination of the aedeagi, which are 

 indistinguishable. I have not seen any specimens showing an inter- 

 gradation in color. 



18. DISONYCHA LEPTOLINEATA Blatchley 



Plate 5, Figures 25, 26 



Disonycha abbreviata var. leptolineata Blatchley, Can. Ent., vol. 40, p. 148, 

 1917 (Dunedin, Fla. ; cotype, U.S.N.M. No. 21514). 



Description. — Oblong oval, somewhat shining, smooth; pale with 

 dark sutural and median elytral vittae, the sutural one extending 

 nearly to the apex ; metasternum in dark specimens usually more or 

 less darkened, undersurface in typical leptolineata entirely pale; 

 outside edge of tibiae and tarsi dark. Head with interocular space 

 more than half width of head, carina broadly rounded and somewhat 

 produced, frontal tubercles not prominent; surface smooth, shining, 

 often impunctate or nearly so, with a single large fovea on each side 

 near eye ; entirely pale, tip of mandibles sometimes darkened. Anten- 



