NORTH AMERICAN COLEOPTEKA. 185 



In the typical or vittate form the head is partly black, the front 

 being nearly always pale. The sutural vitta is extremely narrow, 

 the median broad, but variable in width, sometimes not wider than 

 the yellow on each side, or so wide that the yellow is nearly linear. 

 The marginal vitta is also very narrow, and is at the extreme edge of 

 the elytra, the epiplenrjB are therefore black at apical half and pale 

 at base. 



The pale variety has an entirely pale head. The elytra are en- 

 tirely yellow, except an extremely narrow sutural stripe. This form 

 resembles, at first sight, similar variations which occur in Dlsonycha 

 quinquelifieata. 



Occurs from North Carolina to Florida and Texas. 



10. <E. seniula n. sp. — Oblong oval, rao lerately convex, feebly shiniu};, 

 beneath black, above yellow, thorax maculate, elytra each with three vittfe 

 with bluish green surface lustre. Antenufe piceou«, uot as long as half the 

 body, third joint longer than the fourth. Head black, frontal spot yellow, 

 coarsely and deeply punctured, frontal carina obtuse, the tubercles indistinct. 

 Thorax more than twice as wide as long, sides arcuately narrowing to the front, 

 margin narrow, disc somewhat irregular, sparsely obsoletely punctate, color yel- 

 low, with five piceous spots more or less confluent in the form of M. Elytra a 

 little wider at base than the thorax, humeri rounded, umbone not prominent, 

 surface indistinctly alutaceous, sparsely, very indistinctly punctate, color yellow, 

 with the sutural, median and submarginal vittfe piceous with blue-green lustre, 

 the submarginal not reaching the humerus. Epipleurte pale, the inner border 

 piceous. Prothorax beneath yellow, body black, abdomen black, the last seg- 

 ment yellow, the surface shining, coarsely sparsely punctate. Legs entirely 

 black. Length .18— .22 inch. ; 4.5 -5.5 mm. Plate V. tig. 7. 



This insect so resembles a Disonycha of the caroliniana series that 

 on first impression it would be placed among them. Its facies will 

 enable it to be at once known, together with the fact that in no other 

 vittate species are the legs and underside black. It varies in having 

 the median vitta narrower. 



Occurs in Arizona, special region unknown. 



11. <E. peranrista Fab.— Oval, sometimes slightly oblong, convex, shining, 

 above yellow, thorax with a variable central spot, elvtra each with three l)lack 

 vittfe. .\ntennfe half as long as the body, piceous, the basal joints usually paler. 

 Head reddish brown, cribrately punctate, a moderately deep longitudinal and 

 feebler transver.se groove, frontal carina short, tuberculiforra, tubercles distinct, 

 but flat. Thorax more than twice as wide as lontr, sides arcuately narrowing to 

 the front, margin moderately wide, anterior angles dentiform, disc sparsely punc- 

 tate, yellow, a central spot, piceous. of variable size and form ; scutellum black. 

 Elytra scarcely wider at base than the thorax, humeri rounded, surface always 

 distinctly punctate, but variable in degree, color yellowish, with three piceous 

 vittfe, sutural, median and submarginal. Epipleurfe testaceou.s, the inner edge 



TKANS. AM. ENT. SOC. XVI. (24) MAY, 1889. 



