Crotalus lugubris (a taxonomic synonym) may refer to: \n* Crotalus aquilus, a.k.a. the Querétaro dusky rattlesnake, a venomous pitviper species found in the highlands of central Mexico \n* Crotalus polystictus, a.k.a. the Mexican lance-headed rattlesnake, a venomous pitviper species found in central Mexico \n* Crotalus triseriatus, a.k.a. the dusky rattlesnake, a venomous pitviper species found in Mexico __DISAMBIG__