NORTH AMERICAN COLEOPTERA. 203 



abdomen at sides and apex paler. Legs in great part black. The 

 two described as uniguttata Say and vicina Kby. are synonyms of 

 this variety. 



Pallipes Crotch agrees with the preceding, except that the legs are 

 reddish yellow and the tibite slightly darker, tarsi piceous. 



Conjugata Fab. — In this form the usual black of the surface is 

 replaced by rufous, and the legs, even to the tarsi, reddish yellow. 



In addition to the above a form occurs in Florida and Louisiana 

 somewhat smaller, with the entire head, antennae, underside and legs 

 black. The black vittfe of the elytra are also unusually broad, so 

 that the pale yellow is reduced to a narrow thread. 



The normal marking of the thorax consists of five spots, two 

 forming an anterior row sligiitly behind the anterior margin, three 

 forming a posterior arcuate row. Often the spots forming the cen- 

 tral triangle are confluent, and the lateral spots wanting, while in 

 the var. limbicollis they are all fused, forming a large discal space. 

 Varieties often occur with the thorax immaculate, giving the species 

 again an entirely different aspect, but the form is well recognized as 

 a mere variety. 



Among the species with vittate elytra this one is known by the 

 parallel form, subsulcate elytra and almost entirely black head. 



This species occurs all over the United States and Canada, but is 

 more especially the species of the northern region, that is to say, it 

 extends east and west north of the fortieth parallel of latitude. 



2. I>. quiuqiievittata Say.— Oblong oval. Antennge a little longer than 

 half the boilj', piceous, the under and posterior side of the first three joints tes- 

 taceous. Head yellow, and, except in rare instances, with the occiput piceous, 

 vertex with coarse and deep punctures extending from one side to the other, 

 frontal carina broad and obtuse, the tubercles well marked. Labrum black. 

 Thorax twice as wide as long, narrowed in front, anterior angles distinctly 

 prominent, sides feebly arcuate, the margin narrower, disc not evenly convex 

 usually a slight unibone at the position of the outer dark spot, surface very 

 minutely and sparsely punctnte ; color yellow, normally with five spots arranged 

 in an anterior row of two and a posterior of three, often with the two spots only. 

 Scutellum black. Elytra distinctly wider at l)ase than the thorax, humeri ob- 

 tuse, umbone moderately prominent, surface sparsely finely punctulate, yellow, 

 a narrow sutural stripe, a submarginal line often incomplete at base and not 

 joining the sutural at apex, a very narrow median vitta. Epipleurse pale. Body 

 beneath reddish yellow, metasternum usually piceous. Abdomen densely punc- 

 tured, the pubescence close and conspicuous. Legs reddish yellow, the tibis; at 

 tip darKer, tarsi piceous. Length .22 — .36 inch. ; 5.5 — 9 mm. 



