Cryptocephalus mutabilis Melsheimer,1847

General description: 

Listed under C. dispersus: Red brown body; front and side rims along with two hind spots on the clearly punctured pronotum, yellow; the elytra yellow; a large cross-spot and a number the small surrounding spots, red brown; flat, finely wrinkled interspaces.

Listed under C. discoideus: Black on top, yellow brown underneath; front and side rims of the finely punctured pronotum, yellow; the elytra yellow; a large, lobed mid spot and a number of its small surrounding spots, black; smoothly curved, glossy interspaces.

[Translated from the original German in Suffrian, 1858].

Diagnostic description: 

Pronotum: Orange to red or black and usually with two elongate, yellowish, oblique basal spots; basal margin more or less, lateral margin broadly, and apical margin rather narrowly creamy yellow to light orange; lighter markings sometimes expanded and predominating; light basal markings often reduced to absent, side and apical markings always present; sometimes discal dark area red with margins blackish. Punctation dual, larger punctures minute to small. Elytra: Dull creamy yellow to very light orange and with orange to red or black markings. Each elytron with small oval spots as follows: at base of second interval, at base of fourth interval, on humerus, before base of eighth stria (sometimes absent), before base of sixth stria, and at apex of third and seventh intervals (latter two often expanded). Elytron with a large spot from suture behind scutellum diagonally to fourth stria to past its middle, then diagonally to or nearly to elytral apex; an elongate spot at side behind middle; smaller spots of above pattern (except humeral) often reduced or expanded, large discal spot often expanded and joining other markings. With eight rows of punctures, fifth sometimes, sixth always, and seventh sometimes confused; punctures as dense but smaller than usual, finer apically, often nearly disappearing; inner and outer rows distinct at apex, usually clearly meeting. Prosternum: Anterior margin in male somewhat produced ventrally into a broad lobe; anterior margin in female somewhat to feebly produced into a lobe. Length: 4.3 to 6.5 mm” (White, 1968: 70-1).

“In a few specimens (mostly males), the two small spots at the base of intervals two and four are confluent and join the broad discal spot. This produces a color pattern very similar to that of insertus, but in mutabilis there is a small spot on the eighth stria just below and behind the humeral spot. In insertus, the eighth stria lacks such a spot or is covered by an adjacent, expanded spot” (White, 1968).

Look alikes: 

“I would regard this beetle as the male of C. dispersus. The black mark on the upper side, the fine structure of the pronotum, and the coarse puncture-stripes appear to be only sexually distinct features. I would regard only the extent of the marking on the elytra as unique [to the species], if such a notion were not opposed, at least for now, by Haldeman’s intentions, according to which both sexes of C. disperses differ only by the abdominal pit of the female. There remains, therefore, still much to be determined.”

[Translated from the original German in Suffrian, 1858].

Associations: 

Peanuts; oak, cherry foliage, Kalmia (White, 1968).

Distribution: 

Under C. dispersus: "In the eastern United States, and, as it seems, rare. (Museum Berol., Riehl., Dohrn). Haldeman names Missouri as this beetle’s place of origin. The specimens in Mr. Dohrn’s collections were indicated as originally from Georgia."

Under C. discoideus: the eastern United States (Museum Berol.)

[Translated from Suffrian, 1858]

Canada: Quebec, Ontario; USA: MA, NY, NJ, MD, PA, VA, NC, TN, WV, OH, IL, WI, MS, LA, MO, IA, MN, KS, NE, TX (White, 1968).

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith