108 LENG AND HAMILTON. 



band behind the middle and not extending to the suture, clothed or 

 composed of white pubescence. The elytra are cylindrical, and each 

 bears an oval elevation near the scutellum, which is feeble, or may 

 disappear in small s}>ecimens. This insect is abundant and varies 

 greatly ; the white mai-kings of the elytra ai'e often indistinct and 

 even entirely absent. The name tridbi has been applied to a small 

 specimen lacking the elytral elevation and the bands, but, as pointed 

 out by Dr. Hamilton, these characters indicate only individual va- 

 riation. 



I'senocerns i^uperiiotatiis Say (Clijtits), 1823, Journ. Ac. Phil, iii, p. 425; 

 Leo., ed. ii. 200; Hald., 1847, Trans. Am. Phil. x. p. 42; Osten Sacken, 

 Proc. Ent. Si)C. Phil, i, p. 122; limifer Dej. Cat. 3, ed. p. 375; triath Casey, 

 1. c. ; Hamilton. 1892, Can. Ent. xxiv, 160 and 298. 

 Leno;th .12-.24 inches; 3-5 mm. Habitat. — North Carolina. District of Colum- 

 bia, Pennsylvania, New Jersey, New York, Massachusetts, Canada, Illinois, 

 Iowa, Missoui'i, Nehi-aska, Kansas. [This species breeds in jjrape, currant 

 and gooseberry of choice, and sometimes in twigs of apple, etc.] H. 



Tribe V". Monohammini. 

 Seven genera, constituting three groups, exist in our fauna : 



Legs long, the front pair elongated in % , and the antenna^ much longer than the 

 body. 



Prothorax with lateral spines (ilfono/iammj) itIoiioIiaiiiiiiiiM. 



Prothorax cylindrical {Ptychodes). 



Scape of antennae with a large, well-defined cicatrix. 



Eyes nearly divided Pty diodes. 



Scape of antennae without cicatrix. 



Elytra rounded at tip Dorcliai^elionisi. 



Elytra pointed at tip IletoemiM. 



Legs equal, not elongated {(loes). 



Scape of antennsB with a distinctly limited cicatrix. 



Prothorax cylindrical Cacoplia. 



Prothorax with a lateral spine <iioe!>». 



Scai)e of antennse with the cicatrix not shar])ly defined. 



Prothorax with a strong lateral spine Pleclroilera. 



iflOXOIIAMillUS ServiUe. 



The following synoj)sis is copied from tlu; woi-k of Dr. Horn, Tr. 

 Am. Ent. Soc. xii, p. 190: 



Tips of elytra rounded, the sutural angle acute or si>iniform, more especially in 



the male. 

 General surface color brownish, the elytra irregularly mottled with jiatches of 



brown and gray or white pubescence titilI»tor. 



General surface color piceous or black, more or le.ss bronzed, elytral oi-naiiieii- 



tation as above, the surface sculpture coarser and deeper- iiiaciilwiiiiiis. 



