1188 FAMILY LIII.^ — CHRYSOMELID^. 



by Say. Along the margin of a cypress swamp in Knox County 

 there occurs a distinct variety, which differs from that above men- 

 tioned in having the head, antenna^ legs and under surface (except 

 the tip of abdomen) wholly black ; thorax with only the median 

 spot present; elytra with the black stripes proportionately wider, 

 the disk not alutaceous, strongly bisulcate along the median stripe 

 and very minutely and indistinctly punctate. Length 5-5.5 mm. 

 As the fauna about the swamp is largely Austroriparian in char- 

 acter, this may be the form mentioned by Horn (p. 203 of his 

 Synopsis) as occurring in Florida and I;ouisiana. According to 

 Knab, it is the typical pcnnsylvanica as described by Illiger. 



2192 (6949). Disonycha quinquevittata Say, Journ. Phil. Acad. Nat. 



Sci., Ill, 1824, 85; ibid. II, 227. 



Obloug-oval. Head yellow, occiput piceous; thorax yellow with nor- 

 mally five rounded black spots arranged in a front row of two and a hind 

 one of three, often with only the two-spot row present ; elytra yellow with 

 a narrow sutural stripe, a submarginal line, often incomplete at base and 

 not joining the sutural at apex, and a narrow median stripe (often want- 

 ing), black; antennse piceous, the under side of the first three joints pale; 

 under surface and legs reddish-yellow, the metasternum and tarsi piceous. 

 Thorax twice as wide as long, front angles distinctly prominent, disk very 

 finely and sparsely punctured and usually with a slight umbone on the 

 outer dark spot. Elytra distinctly wider at base than thorax, surface finely 

 and sparsely punctate. Length 6-9 mm. 



Throughout the State, frequent in the northern counties; Vigo 

 and Clay only in the south. May 6-September 7. In Lake and 

 Porter counties the form with the discal black stripe lacking occurs 

 in numbers in the sand dune region on the leaves and flowers of a 

 dwarf willow and the quaking asp. Almost all those from the 

 northern part of the State are of this variety, while those from the , 

 south have the normal elytral markings. Listed as alternata Illig. 



2193 (6948). Disonycha caroliniana Fabr., Syst. Ent, 1775, 122. 



Oval, slightly narrower in front. Head and thorax yellow, the latter 

 with two piceous spots of variable size (rarely absent) on apical half; ely- 

 tra yellow with a narrow sutural stripe and a marginal line not covering 

 the edge, black, these rarely united at apex ; also with a median dark stripe 

 narrower than the yellow spaces each side and not reaching apex ; antennte 

 piceous, the under side of three basal joints pale; under surface and legs 

 reddish-yellow, the tarsi and tips of tibifE piceous. Thorax convex, more 

 than twice as wide as long, sides feebly curved, margins narrow; surface 

 smooth, polished or very indistinctly and sparsely punctured. Elytra scarcely 

 wider at base than thorax, surface very finely alutaceous, finely and sparsely 

 punctured. Length 5.5-6.5 mm. 



Lake County; rare. May 21. One in Webster collection la- 

 belled "Ind." 



