Horn.] -nJ [June 20, 



coarsely, and very sparsely punctured : pygidiura cribrately punctured. 

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



The first dorsal has sometimes a short apical appendix. 



The sexes are marked as in the preceding species. 



Collected near San Diego, California. 



H. lueida, Lee. Bost. Journ. V., p. 37, pi. 1, fig. 3 ; Mars. INIon. IS.jS, 

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



Mentum transvei-sely concave, smooth, triangularly emargiuate 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, suhhumeral deep abbreviated at both 

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

 and apex, pygidiuni coarsely and equally punctured. Hind tibite with 

 up])er crest alone dentate. Length .20 inch ; 5 mm. 



Occurs in the Middle States and Kansas. 



H. fossularis § , Say, Journ. Acad. 182o, p. 47 ; Lee. Bost., Journ. Y., 

 p. o7, pi. 1, fig. 1 ; Mars. Mon. 1853, p. 147, pi. 4, fig. 5; aqualis'^ , 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, suhhumeral deep. Otherwise 

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



Occurs with the preceding. 



H. populnea, Lee. Ann. Lye. Y., p. 103 ; Mars. Mon. 18G0. p. 592, pi. 

 11, fig. 5. 



3Ientum as in lucida. Thorax very sparsely punctured at the sides. 

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

 second shorter, and with an apical appendix freqviently advancing oppo- 

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

 piiuctured, pygidium sparsely punctured. Hind tibise as in luc'dd. 

 Length .18 inch ; .45 mm. 



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



Tribe HISTRIXL 



This tribe may be again subdivided : 



Prosternum distinctly lobed in front Histkint. 



Prosternum not lobed in front ''.'.' SAriaxi. 



The prostcrnallobe appears to be a jiiece distinct from the prosternum, 

 and between tlie 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 epipleur;i3, and when it exists is called the pectoral plate. In 

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

 of 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- 



