ART. 28 EEVISION OF DISONYCHA NOETH OF MEXICO BLAKE 53 



pale. Head with interociilar space scarcely half width of head; 

 •interantennal area carinate but not much produced, tubercles indis- 

 tinctly marked, a few coarse punctures scattered about fovea on each 

 side near eye, often in a row, producing a furrow between the eye 

 and frontal tubercles, but leaving middle of front and occiput 

 smooth; antennal sockets and lower front about carina pale, labrum 

 dark, usually the tubercles and always the area about eyes and upper 

 part of head dark with a metallic luster. Antennae dark brown, the 

 three basal joints paler, third, fourth, and fifth joints subequal, the 

 fourth slightly the longest. Prothorax approximately twice as wide 

 as long, nearly rectangular with sides slightly bowed, somewhat con- 

 vex, without depressions, minutely alntaceous and very indistinctly 

 punctured, entirely pale. Scutellum black. Elytra shining lustrous 

 green or blue, somewhat convex, with humeri only faintly marked, 

 smooth, minutely alutaceous, and finely, not closely punctate. Body 

 beneath with fine, pale pubescence, femora and margin of abdomen 

 pale, mesosternum and metasternum and middle of abdomen dark 

 brown, often with a metallic luster, tibiae and tarsi more or less 

 darkened. Length, 4 to 5.5 mm; width, 2.2 to 3 mm. 



Type locality. — " Carolina." Collected by Bosc. 



Distrlhution. — Maine (Portland) ; Massachusetts (Lynn) ; Rhode 

 Island (Providence) ; New York (Fort Hamilton, Long Island) ; 

 New Jersey ( Clement on ) ; Pennsylvania (Philadelphia); Maryland 

 (Bladensburg) ; District of Columbia; North Carolina (Southern 

 Pines) ; Florida (Boynton, Capron, Jacksonville, Jupiter, INIiami, 

 Point Garda, St. Lucie, Sand Point, North Smyrna) ; Alabama 

 (Mobile) ; Mississippi (Gulfport) ; Louisiana (Bonfouca, Merryville, 

 New Orleans, Tallulah) ; Texas (Alice, Brownsville, College Station, 

 Corpus Christi, Columbia, Cypress Mills, Corsicana, Dallas, Har- 

 lingen, Kerrville, Kingsville, Mercedes, Pierce, Rosson, Wichita 

 Fails, Victoria); Arkansas; Kansas (Douglas County, Onaga, 

 Topeka) ; Missouri (St. Louis) ; Ohio (Columbus) ; Indiana (Tur- 

 key Run) ; Illinois (Anna, Dubois, Centralia, Havana, Prairie du 

 Rocher, Pulaski, Quincy, St. Joseph, Urbana) ; Mexico and Central 

 America. 



Food plants. — Portulaca., Amm^anthus, spinach, beet, chickweed, 

 lettuce. 



Remarks. — Although the original Fabrician description of collata 

 is short, the essentual color characters, the bicolored head, the pale 

 prothorax, pale femora and margin to the abdomen, and smooth, 

 shining green elytra sufficiently differentiate it from other closely 

 allied species. It is found most frequently in collections under the 

 name D. melUcolUs (Say). Horn attempted to distinguish collata 

 and Tnellicollis by size and punctation. Say's description of melli- 



