AMERICAN COLEOPTERA. 41 



MACR0NYCHU8, Mailer. 

 ^facronychvis, Miiller, Illig. Mag. V, ISOi), p. 207. 



M . glabratus. Say, Journ. Acad. V. p. 187 ; Lee. Pr. Ac. 1852, 44 ; lateralis Mels. 

 Proc. Acad. 1844, p. 99 ; Lee. Proc. Acad. 1854, p. 217. (The last reference 

 being the correction of the synonymy.) 



This species has a thorax louger thau wide, convex, glabrous, 

 scarcely punctured and feebly pubescent. The sides in front are 

 nearly straight, gradually diverging from the front angles, then. feebly 

 rounded and slightly sinuate near the hind angles. The elytra are 

 glabrous, somewhat broader behind the middle, striate with moderate 

 punctures at base, becoming fainter and almost impunctured at apex, 

 interspaces moderately convex at base especially the second and fourth, 

 seventh strongly carinate, extending three-fourths the length of the 

 elytra. The space between the carina and the margin of the elytra is 

 densely pubescent with sericeous yellow hairs. Legs elongate. Length 

 .14 inch; 3.5 mm. 



Occurs in Pennsylvania. 



M. parvulus, n. sp. — Elongate, subparallel, black, shining. Head coarsely 

 punctured and pubescent; thorax sub-quadrate, conve.x, with a slight median 

 impression and a lateral carina, sides rounded feebly from base to apex. Ely- 

 tra elongate, subparallel, moderately convex, with striae of large punctures be- 

 coming smaller towards the apex ; interspaces moderately convex, fourth, sixth 

 and seventh carinate and crenulate on top, the first two nearly attaining the 

 apex of the elytra which is finely serrate. Legs moderate, not long. Length 

 ,10 inch ; 2.5 mm. 



A curious little species resembling, at first sight, an Elmis near fcr- 

 ruginem. Easily recognizable by the generic characters. From gla- 

 bratus it may be known by its smaller size, less convexity, more 

 strongly punctured stritio, and by the two nearly entire lateral carinje 

 of the elytra. The thorax is also shorter and regularly rounded, al- 

 though feebly, from base to apex. The base of thorax is slightly 

 broader than the apex. The elytra are much less convex and have not 

 the lateral sericeous space. The legs are usually brownish. 



Occurs at Fort Tejoii, California. 



ANCYRONYX, Erichs. 

 Anryronyx, Erich3, Ins. Deutsch. Ill, 1S47, p. 522. 



A. variegatas. Germ. (Macronychus) Ins. Nov. 89; Sturm Cat, II, 63, pi. 2, fig. 

 12: ductus Say (Elmis) Journ. Acad. V. 186. 



This insect is easily known by the generic characters given in the 

 table. The legs are long, slender and spider-like. The head promi- 

 nent, and not protected beneath by a prosternal lobe. Color of body 

 black, thorax with an apical and basal yellow margin, elytra with a 



TUAXS. AMKIl. EST. SOC. (6) rKBItCARV, 1870. 



