174 GEO. H. HORN, M. D. 



C (Scaphinotus) Ridingsi Bland., Proc. Ent. Soc. Phil, i, p. 353.— Moder- 

 ately elongate, black, upper surface distinctly violaceous. Head elongate, 

 smooth. Thorax cordate, a little longer than wide, sides in front feebly arcuate, 

 posteriorly oblique, hind angles obtuse, margin narrowly reflexed, disc feebly 

 convex, impressions moderate, surface not punctured. Elytra oval, moder- 

 ately convex, margin very narrow, surface striate, striae crenately punctured, 

 intervals convex, slightly confused at the tip, inflexed portion sparsely punc- 

 tate. Body beneath smooth. Length .50 inch j 12.5 mm. 



For a long time I had been unwilling to recognize this as a distinct 

 species, preferring to consider it a diminutive Andreiosii, but whatever 

 its affinities may be they are certainly more removed by its male tarsal 

 characters from that species than from Guyotii. The first three joints 

 of the anterior tarsi % are papillose beneath, and the first joint is so 

 clothed over three-fourths of its surface. 



The specimens I have seen were all collected by Mr. Ulke, near 

 Cresson Springs, Pennsylvania. 



C. (Scaphinotus) Andrewsii Harris, Bost. Journ. ii, p. 195; Germari 

 Chaud., Bull. Mosc. 1861, ii, p. 495. — Form slender, moderately elongate, sur- 

 face more or less cupreous. Head elongate, eyes moderately prominent. Thorax 

 longer than wide, subcordate, sides in front feebly arcuate, posteriorly oblique, 

 hind angles obtuse, disc feebly convex, impressions moderate. Elytra oval, 

 usually broadest behind the middle, moderately convex, margin very narrow, 

 surface deeply striate, strife crenately punctured, intervals somewhat confused 

 near the tip, inflexed portion of elytra moderately densely punctured. Body 

 beneath smooth, shining. Length .74 — .86 inch; 19— 22 mm. 



This species is nearly as slender as angusticollis. Its thorax is 

 much narrower than in Guyotii which it also resembles otherwise. 

 The only character on which any positive reliance can be placed is in 

 the sexual peculiarities of the anterior tarsi of the male. 



Occurs from Pennsylvania to North Carolina. 



PEMPHUS Motsch. 



Bull. Mosc. 1865, ii, p. 312. 



Head elongate, eyes not prominent, gense moderately dilated cover- 

 ing the base of the maxillae and with a slight incisure. Gula not 

 transversely impressed. Inner lobe of maxillae armed with rather 

 long stout spines. Anterior tarsi of male with three joints dilated 

 and densely spongy pubescent beneath, the first joint so covered over 

 nearly the entire surface, the fourth with a few papillae at middle. 

 Legs long and slender and varying in the sexes, the posterior longer 

 in the male. 



The general appearance of the species belonging here is totally 

 different from any other in the entire series and marks it as a very 



