Citation	Auteur	Année	Page	Romains	Figure	Patrie	Catégorie
Cyllene difficilis	Chevrolat	1862	263			Cuba (Havane)
Cyllene difficilis	Chevrolat	1862	528			île de Cuba et environs de la Havane
Cyllene difficilis	Lacordaire	1869	62	nota 3		Cuba
Clytus difficilis	Gemminger & Harold	1872	2928			Cuba	Catalogue
Cyllene crinicornis	Bates	1880	47			Mexico, Granada, Vera Cruz ; Honduras, river Sarstoon	Distribution, misapplied
Cyllene crinicornis	LeConte	1880	sans pagination	xxiv		Texas	Plante nourricière, misapplied
Cyllene crinicornis	Horn	1880	134, 135		pl. II, fig. 8e	California, Sonora, Arizona, Texas, Louisiana and Nassau N. P.	Distribution, misapplied
Cyllene crinicornis	Packard	1881	138				Biologie, misapplied
Cyllene crinicornis	Bates	1885	294			Mexico, Tuxtla, Izucar, Guajuco in Nuevo Leon ; Guatemala, San Isidro ; Nicaragua, Chontales ; Panama, Tolé, San Feliz, Nancito, Bugaba	Distribution, misapplied
Cyllene crinicornis	Leng	1887	196				misapplied
Cyllene crinicornis	Packard	1890	646				Moeurs, misapplied
Cyllene difficilis	Gahan	1895	114			Cuba - Havana
Cyllene crinicornis	Schwarz	1896	48				Biologie, misapplied
Cyllene crinicornis	Beutenmüller	1896	76				Plante nourricière, misapplied
Cyllene crinicornis	Wickham	1898	41				Distribution, misapplied
Cyllene crinicornis	Fall	1901	146				Distribution, misapplied
Cyllene crinicornis	Townsend	1903	78				Distribution, misapplied
Cyllene crinicornis	Knaus	1905	352				Distribution, misapplied
Cyllene crinicornis	Snow	1906	146				Distribution, misapplied
Cyllene crinicornis	Schaeffer	1908	328			Texas, Brownsville	Distribution, misapplied
Cyllene difficilis	Aurivillius	1912	384			Cuba	Catalogue
Cyllene reducta	Casey	1912	351			Texas?
Cyllene filicornis	Casey	1912	352			Texas
Cyllene crinicornis	Leng & Mutchler	1914	447			Jamaica?	Distribution, misapplied
Cyllene difficilis	Leng & Mutchler	1914	447			Cuba
Cyllene crinicornis	Garnett	1918	209				Distribution, misapplied
Cyllene crinicornis	Craighead & Middleton	1921	203			southwestern United States	Plante nourricière, misapplied
Cyllene crinicornis filicornis	Casey	1924	270
Cyllene crinicornis	Casey	1924	270				synonymie, misapplied
Cyllene crinicornis	Gowdey	1926	21				Distribution, misapplied
Cyllene crinicornis	Hopping	1928	8				synonymie, misapplied
Cyllene crinicornis	Linsley & Martin	1933	181			Texas (Brownsville)	Moeurs, misapplied
Cyllene crinicornis	Linsley	1935	85			Mexico, Real de Arriba	Distribution, misapplied
Cyllene crinicornis	Doane & al.	1936	182			Mexico, Hawaiian Islands	Plante nourricière, misapplied
Placosternus difficilis	Hopping	1937	448		pl. III	California, Texas, Cuba	comb. nov., synonymie
Cyllene crinicornis	Darlington	1938	692			Cuba (Santa Clara)	misapplied
Placosternus difficilis	Linsley	1940	561			Lower Rio Grande Valley of Texas	Moeurs
Cyllene difficilis	Blackwelder	1946	580			Cuba	Catalogue
Placosternus difficilis	Vogt	1949	143			Texas	Moeurs
Placosternus difficilis	Cazier & Lacey	1952	35			Cuba, Bahama Islands	Distribution
Placosternus difficilis	Linsley	1964	93		fig. 29 (mâle)	West Indies, northern Mexico, and southwestern United States from Texas to southern California	Faune
Megacyllene difficilis	Zayas	1975	133		pl. 17, fig. c	Cuba (toda la Isla)	Faune
Placosternus difficilis	Manley & French	1976	47		fig. 1
Placosternus difficilis	Hovore & Giesbert	1976	356			Texas	Plante nourricière
Placosternus difficilis	Hovore, Penrose & Neck	1987	306			Florida & West Indies, northern Mexico, Texas & southern California	Distribution
Placosternus difficilis	Chemsak, Linsley & Noguera	1992	70			Fla, Tex, NMex, Ariz, Calif, México, Indias Occidentales	Catalogue
Placosternus difficilis	Monné	1993	14			Cuba, Bahamas, northern México, and southwestern United States, from Texas to southern California	Catalogue
Placosternus difficilis	Browne, Peck & Ivie	1993	46			Southern United States, Mexico, Cuba, Bahamas (Great Abaco, South Bimini, New Providence, Eleuthera)	Distribution
Placosternus difficilis	Chemsak & Noguera	1993	62			Mexico (Jalisco)	Distribution, Plante nourricière
Placosternus difficilis	Lingafelter & Horner	1993	175			Throughout the southwest	Distribution
Placosternus difficilis	Monné & Giesbert	1994	116			s USA (CA-FL), n Mexico, Cuba, Bahamas	Catalogue
Placosternus difficilis	Noguera & Chemsak	1996	401			Mexico	Distribution
Placosternus difficilis	Browne & Peck	1996	2159, 2160		Tables 1, 2		Distribution
Placosternus difficilis	Linsley & Chemsak	1997	420				Plante nourricière
Placosternus difficilis	Terrón	1997	222				Distribution
Placosternus difficilis	Peck & Thomas	1998	119				Distribution
Placosternus difficilis	Monné	2001	42			Southwestern United States, from Texas to southern California, northern México (Jalisco), Cuba, Bahamas	Plante nourricière
Placosternus difficilis	Noguera & al.	2002	624			México (Morelos)	Distribution, Moeurs
Placosternus difficilis	Toledo & al.	2002	528		Appendix 1	Mexico (Chiapas)	Distribution, Moeurs
Placosternus difficilis	Turnbow, Cave & Thomas	2003	15			Honduras	Distribution
Placosternus difficilis	Monné	2005	111			Southwestern United States, from Texas to southern California, northern Mexico (Jalisco, Morelos), Cuba, Bahamas	Catalogue
Placosternus difficilis	Hovore	2006	373			Guatemala	Distribution
Placosternus difficilis	Monné & Hovore	2006	46			sUSA (CA-FL), nMexico, Honduras, Cuba, Bahamas	Catalogue
Placosternus difficilis	Thomas & Turnbow	2007	584			Andros Island, Bahamas	Distribution
Placosternus difficilis	Noguera & al.	2007	310			México (Jalisco): San Buenaventura	Distribution
Placosternus difficilis	MacRae & Rice	2007	242			Texas	Distribution, Plante nourricière
Placosternus difficilis	Turnbow & Thomas	2008	21			Andros, Eleuthera, Gorda Cay, Great Abaco, New Providence, South Bimini	Distribution
Placosternus difficilis	Noguera & al.	2009	87			Mexico: Sierra de San Javier, Sonora	Distribution
Placosternus difficlis	Morales-Morales & al.	2012	38, 42		fig. 2b	Depresión Central de Chiapas, México	Distribution, Biologie, misspelling
Placosternus difficilis	Noguera & al.	2012	620		Apéndice	Santiago Dominguillo, Oaxaca, México	Distribution
Cyllene reducta	Lingafelter & al.	2014	309, 366		fig. 142 o (lectotype)	USA: Texas, Brownsville (?)	Lectotype
Placosternus difficilis	García Morales & al.	2014	101			México, Tamaulipas	Distribution
Cyllene filicornis	Lingafelter & al.	2014	62		fig. 66 e (holotype)	USA: Texas	Holotype
Placosternus difficilis	Devesa, Fonseca & Barro	2015	33, 286		figs 1-2 (mâle), 3-4 (femelle), 5-9 & carte	Cuba: Artemisa, Camagüey, Holguín, La Habana, Matanzas, Mayabeque, Pinar del Río, Santiago de Cuba	Faune, Plante nourricière, Moeurs
Placosternus difficilis	Hernández-Cárdenas & al.	2016	497, 498			Tepoztlán, Morelos	Plante nourricière
Placosternus difficilis	Vargas-Cardoso & al.	2018	94			Mexico (Morelos): San Andres de la Cal	Distribution, Plante nourricière
Megacyllene difficilis	Martínez Aguilar	2023	54			Mexico: Sierras de Taxco-Huautla	Distribution
Placosternus difficilis	Ferreira & Mermudes	2023	148

Placosternus difficilis compte 3 types :