NORTH AMERICAN COLEOPTERA. 207 



This species is about as little variable as any in the genus. It 

 may be readily known by the distinctly punctate thorax and black 

 underside. 



Occurs in California and Nevada. 



7. D. glabrata Fab. — Oblong oval, surface very shiniDg as if varnished. 

 Antennae half the length of the body, black, three basal joints testaceous poste- 

 riorly. Head variable color, often entirely black, except the front, sometimes 

 nearly entirely yellow, but always with the posterior portion of the occiput fus- 

 cous, frontal carina and tubercles well marked, surface smooth. Labrum brown. 

 Thorax yellow, usually with a narrow median spot, sometimes an indistinct spot 

 each side, rarely immaculate, surface smooth, shiniug, more than twice as wide 

 as long, narrowed in front, sides feebly arcuate, margin narrow. Scutellum black. 

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

 prominent, surface smooth, shining, the punctures extremely fine and sparse ; 

 color yellow, the suture and margin, involving the epipleurse, a median vitta 

 black. Body beneath yellow, the posterior portion of metasternum rarely pice- 

 ous. Abdomen very finely alutaceous, sparsely punctate, hairs short and sparse. 

 he^LS usually yellow, sometimes the femora are infuscate, tips of tibife and tarsi 

 piceous. Length .20 — .22 inch. ; 5 — 5.5 mm. 



In this species specimens rarely occur with the extreme lateral 

 margin of the elytra and epipleurj^e pale, in this case the broad me- 

 dian vitta, the more or less dark head, the thoracic ornamentation 

 will distinguish it from arizoiue. From mariUvia it may at once be 

 known by the pale underside and smooth thorax. 



Occurs from Geoi'gia to Arizona. 



8. D. abbreviata Mels. — Oval, slightly oblong. Antennae as long as half 

 the body, piceous, the underside of three basal joints pale. Head (and labrum) 

 yellow, the frontal carina obtuse, tubercles distinct, surface smooth, a rounded 

 punctured fovea at the upper and inner border of the eye. Thorax twice as wide 

 as long, narrowed in front, sides arcuate, margin narrow, surface regularly con- 

 vex, smooth, entirely yellow, without spots. Scutellum yellow. Elytra slightly 

 wider at base than the thorax, humeri obtuse, umbone distinct, a slight depres- 

 sion within it, surface sparsely, indistinctly punctulate, color yellow, a sutural 

 black vitta, another median, both moderately wide, black. Body beneath and 

 epipleurse entirely yellow. Abdomen very sparsely punctate, rather shining, 

 the pubescence short, sparse and inconspicuous. Legs yellow, the outer side of 

 the tibiae and the tarsi black. Length .24 — .34 inch. ; 6 — 8.5 ram. 



This species is one of the least variable of our vittate species. 

 When recent the yellow color is slightly tinged with red. By the 

 absence of the submarginal vitta and the immaculate thorax this 

 species is easily known. 



Occurs from the Middle States to Florida and Texas, extending 

 into Mexico. 



