Transferred to Lintneria by Butler, 1876 November, Trans. zool. Soc. Lond.9: 620. Transferred to Hyloicus by Rothschild & Jordan, 1903, Novit. zool.9 (suppl.): 118 (key), 123. Returned to Lintneria by Tuttle, 2007, The Hawkmoths of North America: 97.
Similar to Lintneria lugens and Lintneria geminus, but 1st protarsal segment shorter, and midtibia spiny. Thorax and forewing upperside yellow brown with pattern of dark brown to black markings; in the similarly patterned Lintneria lugens, Lintneria separatus and Lintneria geminus the forewing ground colour is more grey. Protarsal 1st segment about half the length of the tibia, a little longer than the 2nd, with 2 or 3 long spines of which the apical is nearly as long as the segment itself.Hindtibia with terminal spur nearly two-thirds the length of the 1st hindtarsal segment.Spurs generally with 1 or more spines.Paronychium with one long lobe on each side. Forewing upperside with discal spot, unlike Sphinx canadensis. Uncus more gradually narrowed than in Lintneria geminus.Gnathos as in Lintneria geminus.Harpe deeply concave, intermediate in shape between those of Lintneria geminus and Lintneria eremitoides, with a simple dorso-distal tooth; no serration.Aedeagus very similar to that in Lintneria geminus, the tooth not quite apical; the projecting lobes heavily dentate, with teeth almost in a row, Ostial plate very similar to that in Lintneria geminus, but as wrinkled as in Lintneria justiciae.