Horn.] Ibb [June 20. 



H. coenosus, Er. Jahrb., 1834, p. 154 ; Mars. Mon., 1854, p. 270, pi. 8, 

 fig, 76; decisus, Lee. Bost. Journ. V., p. 51, pi. 2, fig. 10; repletus, Lee. 

 loc. cit. p. 49, pi. 2, fig. 6. 



Thorax bistriate, inner stria entire, outer abbreviated but extending 

 beyond the middle, and between the two stria at apex are either a few 

 punctures or a very short stria. Front not impressed. Elytra with four 

 entire striae, a fifth extending to middle and the sutural longer, sub- 

 humeral at apex deeply impressed, and with a very short feebly im- 

 pressed humeral appendix. Epipleurae bistriate. Propygidium very 

 sparsely punctured, pygidium very minutely punctulate, and with a few 

 coarser punctures near the sides. Anterior tibiae with the outer margin 

 regularly arcuate, minutely denticulate. Hind tibia? biseriately spinu- 

 lose. Length .18-22 inch ; 4.5-5.5 mm. 



I cannot find that repletus differs except in having the fifth dorsal stria 

 a trifle longer. 



Occurs from the Gulf States to Mexico. 



H. punctifer, Payk. Mon. p. 25, pi. 4, fig. 1, Lee. Bost. Journ. V.. 

 p. 51, pi. 2, fig. 9 ; Mars. Mon., 1854, p. 265, pi. 8. fig. 67. 



The surface sculpture of this species is precisely that of ccenosux, and 

 differs as follows : Head with a shallow fovea. Outer thoracic stria not 

 extending to middle. Humeral appendicular stria short deeply im- 

 pressed. Propygidium on each side with a shallow impression. Anterior 

 tibia- feebly quadridentate. Length .22 inch ; 5.5 mm. 



One specimen said to have been found in the Middle States, corres- 

 ponding exactly with Marseul's description, is before me. 



H. thoraeicus, Payk. Mon. p. 20, pi. 2, fig. 5. 



From the description this species appears to be allied to the preceding. 

 It is, however, entirely unknown, either to us or Marseul. 



H. abbreviatus, Fab. Syst. Ent. p. 53 ; Lee. Bost. Journ. Y., p. 52, 

 pi. 2, fig. 11 ; Mars. Mon., 1854, p. 283, pi. 8, fig. 82 ; subhemisphericus, 

 Beauv. Ins. p. 180, pi. 6, fig. 7 ; bifidus, Say. Journ. Acad. 1825, p. 34: 

 Lee. loo. cit. pi. 2, fig. 12 ; Mars. loc. cit. p. 2*4, pi. 8, fig. 83. 



Thorax at sides bistriate, outer stria extending to middle, inner entire. 

 Elytra with four entire stria? coarsely punctured, fifth short, apioal, 

 sutural half the length of the elytra. Subhumeral at apex deeply 

 impressed, with humeral appendix extending to base, also deeply im- 

 pressed, and joining the apical portion behind its tip. Propygidium 

 coarsely and sparsely punctured, pygidium nearly impunctate. Anterior 

 tibiae feebly 4-dentate apical tooth bifid. Length .12-. 20 inch ; 3-5 mm. 



This species varies somewhat in the length of the outer thoracic stria;, 

 as well as in the depth of the elytral stria?. One specimen before me 

 has a mere trace of an external subhumeral near the apex. 



Middle States to Georgia, and westward to Montana and Kansas. 



H. eivilis, Lee. Bost. Journ. V., p. 55, pi. 3, fig. 5 ; Mars. Mon., 1854, 

 p. 570, pi. 9. fig. 134. 



