234 GEO. H. HORN, M. D. 



may be made very complete, there being no link wanting either in 

 this respect or in geographical distribution. 



Occurs over the entire Continent north of Mexico. 



N. Tespilloides Herbst. — This species although quite distinct from the 

 preceding presents but little that can be used in description to distinguish it. 

 The only permanent character is the entirely black antennal club. It is al- 

 ways smaller and the surface much less sculptured. There are the same color 

 varieties as in pustulatus, but I have never yet seen specimens entirely black or 

 with entirely yellow side margin. Length .44 — .60 inch ; 11 — 15 mm. 



Occurs in Canada, and from thence westward to Oregon and Wash- 

 ington Territory and north to Alaska, also in northern Europe. 



N. tomentosns Weber.— Moderately elongate, black, shining, elytra with 

 two fascise and epipleural fold orange-red. Head shining, minutely punctulate, 

 rhinarium large, red. Antennae piceous, club black. Thorax broader than long, 

 transversely cordiform, apex truncate, sides at middle slightly sinuate, base 

 feebly arcuate, margin moderately wide, broader at the base, disc convex, 

 surface punctate and moderately densely clothed with golden yellow hair. 

 Scutellum flat, sparsely punctate. Elytra scarcely wider than the thorax, sides 

 nearly straight and slightly divergent posteriorly, marginal line distinct but 

 not prominent, apex sinuate truncate, epipleural fold wide, surface rather 

 coarsely but not densely punctate and with two faint discal costse ; color piceous 

 or black with two orange-red fasciae, the post-humeral and sub-apical extending 

 from the epipleural fold to the suture and rarely interrupted. Abdomen above 

 densely punctured, beneath very sjsarsely punctulate. Metasternum clothed 

 with golden yellow pubescence. Middle and posterior tibiae gradually broader 

 to tip, straight. Anterior tibiae with equal spurs, the outer apical angle pro- 

 longed. Length .56— .80 inch J 14— 20 mm. 



The anterior tarsi of the male are broadly dilated. The posterior 

 trochanters are not much prolonged in either sex. 

 Widely distributed over the Atlantic region. 



SIL,PHA Linn. 

 Head moderate in size, suddenly narrowed in front of the eyes except in 

 opaca and bituberosa and somewhat narrowed behind except in these. Eyes 

 oval, slightly oblique, not prominent except in nurinamensis. Labrum trans- 

 verse, variably emarginate. Antennae free at base, inserted close to the anterior 

 margin of the eye and distant from the frontal margin except in opaca and 

 bituberosa, eleven-jointed, not geniculate, the last four or five forming an oblong 

 club either loose or moderately compact. Palpi short, the last joint cylindrical 

 obtuse at tip. Anterior coxsb conical, prominent, contiguous and with large 

 trochantin, the cavities strongly angulate externally and widely open behind, 

 the post-coxal portion of the epiniera short and broad. Middle coxae sei^arated, 

 widely in all the species except opaca and bituberosa. Posterior coxae contiguous 

 not very prominent. Legs moderate in length, the tibiae slender, gradually 

 broader to tip and spinulose externally. Anterior tarsi more or less dilated in 

 the males. Thorax usually emarginate in front. Elytra margined, the margin 

 more or less reflexed, the epipleural fold moderately wide more or less concave. 

 Body winged, abdomen with six segments. 



