Horn.] 27 6 [ June 20 - 



coarsely, and very sparsely punctured : pygidium cribrately punctured. 

 Lower hind tibial crest not dentate. Length .20 inch ; 5 mm. 



The first dorsal lias sometimes a short apical appendix. 



The sexes are marked as in the preceding species. 



Collected near San Diego, California. 



H. lucida, Lee. Bost. Journ. V., p. 37, pi. 1, fig. 2 ; Mars. Mon. 1853, 

 p. 177, pi. 4, fig. 18. 



Mentum transversely concave, smooth, triangularly emarginate in 

 front. Thorax punctured at the sides, marginal stria entire. Elytra 

 with first dorsal entire, second short basal, rarely with a very short apical 

 appendix, third punctiform, basal, subhumeral deep abbreviated at both 

 ends. Propygidium smooth at middle, coarsely punctured at the sides 

 and apex, pygidium coarsely and equally punctured. Hind tibiae with 

 upper crest alone dentate. Length .20 inch ; 5 mm. 



Occurs in the Middle States and Kansas. 



H. fossularis § , Say, Journ. Acad. 1825, p. 47 ; Lee. Bost., Journ. V., 

 p. 37. pi. 1, fig. 1 ; Mars. Mon. is,-):!, p. 147, pi. 4, fig. 5; mqualis$, Say, 

 loc.cit. 



Resembles the preceding, but differs in the striation of the elytra. The 

 first stria is short, not larger than a fourth of the elytra, the second 

 shorter, and the third merely a trace, subhumeral deep. Otherwise 

 as in lucida. Length .20 inch ; 5 mm. 



Occurs with the preceding. 



H. populnea, Lee. Ann. Lye. Y., p. 163 ; Mars. Mon. 1860, p. 592, pi. 

 11, fig. •"">. 



Mentum as in lucida. Thorax very sparsely punctured at the sides. 

 Elytra with first dorsal short, scarcely a third the length of the elytra : 

 >nd shorter, and with an apical appendix frequently advancing oppo- 

 site the tip of the first, Propygidium smooth, at sides very sparsely 

 punctured, pygidium sparsely punctured. Hind tibiae as in lucida. 

 Length .IS inch ; .45 mm. 



Occurs in Arizona, between the layers of dead Cottonwood bark. 



Tribe HISTRINI. 



This tribe may be again subdivided : 



Presternum distinctly lobed in front • • • Histbini. 



Presternum not lobed in front Sapkixi. 



The prosternallobe appears to be a piece distinct from the presternum, 

 and between the two the suture is more or less distinct. In the majority 

 of cases the lobe is provided with a lateral extension, which joins the 

 prothoracic epipleurae, and when it exists is called the pectoral plate. In 

 every case when the pectoral plate exists it forms part of the boundary 

 i »f the antennal fossa, and usually renders the latter partially invisible 

 from beneath. 



Th subtribes as thus defined are essentially the same as in the " Classi- 



