1853.] 353 



beneath, in Zenoa they are -without lobes. Zenoa is also remarkable for its pro- 

 tuberant front, and less exserted mandibles. 



Cyphomdje. 



Coleoptera pentamera, antennis ll-articulatis, rarius biramosis, minus approxi- 

 matis; ligula emarginata;.coxis anticis conicis prominulis, acetabulis inter pro- ft 

 mesosternum receptis ; prosterno corneo, inter coxas angustissiriio, non abbre- 

 viato; mesosterno nee concavo, nee protenso ; abdomine segmentis ventralibus 

 .5 liberis ; coxis posticis plus minusve lair inatis ; tarsi articulo 4to praecipue 

 bilobato, ultimo brevi, unuuibu? parvis integ'is. 



A. Tarsi articulo 4to bilobo : 



Tarsi omnes articulo 3io distincto ; (thorax non clypeatus.) 



Tibias calcaribus obsoletis ..... Helodes Latr. 

 Tibiae calcaribus elongatis armatae .... Scirtes Illiger, 



Tarsi postici articulo 3io vix distincto ; (thorax cly- 

 peatus) ........ Sacodes Lee. 



B. Tarsi filiiormes, tibiae calcaratae .... Eucinetus Schnpp. 



Helodes Latr. (Elodes,) 1796. 



Cyphou Fabr. 1798. 



From the genus as defined by Guerin in his very beautiful monograph, con- 

 tained in the " Species et Iconographie generique des Animaux Articules,"' I 

 have removed certain species having the thorax extended over the head, to form 

 a new genus Sacodes. The remaining species may be grouped in the following 

 manner : 



a. Antennae articulo Imo dilatato, 2 et 3io parvis, hoc minu- 



tissimo ......... Sp. 1. 



b. Antennae articulis 2 et 3 parvis, illo maiore . . . Sp. 2 4. 



c. Antennae articulis 2 et 3 sequentibus paulo brevioribus . Sp. 5 12. 



a. 



1. H. d i s c o i d e a, oblongo-ovalis, modice convexa, rufo-flava, pubescens, 

 elytris dense punctatis macula maxima nigra communi notatis. Long. '16 '18. 



Guerin, Spec, et Icon. An. Art. No. 9, p. 9. 



Cypho7i discuidiis Say, Journ. Ac. Nat. Sc. 5, 161. 



Georgia, Pennsylvania and Missouri. The antennae of the male are biramose, 

 the third and following joints being furnished with two long cylindrical basal 

 processes. The suture of the elytra is frequently yellow, so as to divide the 

 larire black spot. The male is very rare; the only specimen seen by me was 

 kindly given me by Dr. Melsheimer. 



b. 



2. H. cone in na, elongato-ovalis, minus convexa, nigra, tenuiter griseo- 

 pubescens, thorace punctulato, elytris dense punctatis, laete rufis, basi trienteque 

 postico nigris. Long. 16. 



San Francisco, California, June. Body oblong, very distinctly convex, 

 rounded at each end, black, sparsely pubescent. Head scarcely punctured ; 

 antennas half as long as the body, entirely black, 2d and 3d joints nearly equal, 

 Together scarcely two thirds the length of the 4th joint. Thorax nearly three 

 times wider than long, emarginate in front, very slightly rounded on the sides, 

 broadly rounded at the base, surface finely punctulate. Elytra one third wider 

 Than the thorax, almost parallel, tolerably densely punctured, with very faint 

 traces of two lines; black, with a very broad transverse red band, extending 

 from near the ba^e to within one third of the apex, and being a little dilated 

 towards the suture ; epipleurae, under surface and feet black. 



3. H. ruficollis, oblongo-elongata, atra pubescens, thorace subtilissime 

 punctulato, rufo saepe nigro notato, vel nigro elytris densius punctatis, obsoletis- 

 sime tricostatis, tibiis tarsisque testaceis, antennis basi plus minusve testaceis, 

 articulis 2 et 3io coniunctis 4to duplo brevioribus. Long. '15. 



