BEETLES OF THE GENUS MYOCHROUS — BLAKE 15 



with a more hairlike scale from each puncture, the scales on the pro- 

 sternum like those on the upper surface. A small depression at the 

 tip of the abdomen in both sexes, roundish in the female, more tri- 

 angular in the male. Hind femora bluntly toothed, anterior tibiae 

 toothed on the inner side. Length 4.2 to 5.5 mm. ; width 2 to 2.5 mm. 



Type. — Unknown. 



Type locality. — "Inhabits Missouri." 



Other localities. — Maryland: Chesapeake Beach, Plumpoint (in 

 thicket of reeds near the beach) ; Virginia: Alexandria, Fredericks- 

 burg, Fort Monroe, Nelson County, Nutbush ; District or Columbia : 

 Rock Creek Park ; West Vh^ginia : Ripley, White Sulphur Springs ; 

 North Carolina : Clemson College ; Georgia : Miner ; Ohio : Mar- 

 ietta; Indiana: Paxton (on corn), Vincennes; Kentucky: Glas- 

 gow, Henderson; Tennessee: Clarksville, Henderson; Alabama: 

 Montgomery ; Mississippi : Clarksville, Grenada (on turnip) , Hancock 

 County, Meridian; Natchez (on Ambrosia psilostachya) , Rock- 

 port, Vicksburg ; Louisiana : xllexandria (on cotton boll) , Ama (feed- 

 ing on okra), Bunkie (on cotton), Caddo Parish, East Port, Gueyden, 

 Houma (in sugarcane sheath), Lafayette (in stem of sugarcane), 

 Many, New Orleans (on globe artichoke). Opal, Palm, Madison Par- 

 ish, St. James, Shreveport (on cotton square), Southport (in sugar- 

 cane fields) ; Tallulah (on cotton), Vidalia; Texas: Clarksville (on 

 Helenium roots) , Dallas, Greenville, Mesquite, Piano, Raymondville, 

 Utopia, Wolfe City (on Helenium tenuifoUum) ; Arkansas : Beebe, 

 Conw^ay, Oil Trough, Scott County, Paris, Pine Bluff (on cotton), 

 Texarkana ; Oklahoma : Medf ord, Oklahoma City, El Reno, Tulsa 

 County; Kansas: Douglas County, Leavenworth, Onaga, Riley 

 County, Washington County (in cornfield, many specimens), Wel- 

 lington; Missouri: Bellflower, Columbia, Charleston, Oran, St. 

 Louis ; Iowa : Appanoose County, Davis County, Decatur County, 

 Jefferson County, Lee County, Page County, all from "B. Blue stem." 



Remarks. — Although there are two species occurring in the region 

 from which Say described Colaspis denticollis^ it seems likely that the 

 species that is abundant throughout this area should be the one he 

 collected rather than the species that is rare in collections and that 

 was described much later in 1931 from North Dakota [Myochrous 

 movallus Johnson). Horn, in describing Say's species, writes that 

 the scales are not closely placed and permit the bronze color to be 

 readily visible. This description does not apply to M. movallus, 

 which is more densely covered by broader scales. In the species that 

 is abundant, which is probably Say's species, the scales are narrow and 

 not very dense. In fact, denticollis is one of the least densely pubes- 

 cent of any of the North American species of Myochrous. Further- 

 more, the thorax is broad and not very convex, in contrast with other 



