1853.] 929 
The Atopide seem by this genus and Anchytarsus to show a slight affinity 
towards the Parnide, through the anomalous genus Eurypalpus Lec. (Proc. 
Acad. Nat. Se. 6, Al.) 
S.scutellaris, elongato-oblongus, piceus, fusco. pruinosus, thorace punc- 
tato, antrorsum angustato, basi bisinuato, angulis posticis acutis, elytris scabro- 
punctatis, scutello albo pubescente. Long. :-55—-87. 
One pair, Sacramento, California, from Mr. Rathvon. Body elongate, nar- 
rowed at each end, sides parallel at the middle, piceous, covered with very short 
depressed, dirt colored pubescence. Antenne black, strongly serrate in the 
male, slightly serrate in the female. Thorax nearly three times as wide as the 
head, nearly twice as wide as long, strongly narrowed in front, sides at the 
middle almost angulated, then slightly concave to the posterior angles, which 
are acute; base bisinuate; surface finely punctured, broadly concave along the 
margin behind the middle, and broadly transversely impressed at the base. 
Scutellum round, covered with dense white hair. Elytra scabrous with shallow 
punctures, spaces between the punctures finely punctulate; the elevated lines, 
which may be traced in allied genera are slightly visible. Body beneath more 
densely pruinose with short cinereous hair. 
The other species of this family known to inhabit the United States are: 
1, Anchytarsus bicolor. Atopa bicolor ! Mels. Proc. Acad. Nat. Sc. 2, 
221. Anchytursus ater Guérin Icon. Anim. Artic., No. 15, (Jan. 1849.) Penn- 
sylvania, S. 8. Haldeman. 
z. Odontonyx ornata Guerin, loc. cit. No. 14. Atopa ornata ! Mels. Pr. 
Acad. Nat. Sc. 2, 220. Pennsylvania, not rare. 
3. Dascillus melanophthalmus Gueérin, loc. cit. No. 13, p.6. I 
have not seen this species, but learn from my father that it occurs in Georgia. 
Atopa fusca Mels. (Proc. Acad. 2, 221) is, as Guérin has already observed, a 
Ptilodactyla, and therefore cannot be placed in this family. 
The singular genus Zenoa Sey (Bost. Journ. Nat. Hist. 1, 153,) differs from 
the genera above cited, by its immarginate thorax, prominent mandibles, sub- 
pectinate antenne, and elongate densely hairy paranychia; these characters 
approximate it to Sandalus (female) ; from the Rhipiceride, however, it differs 
in having the anterior coxez more deeply imbedded between the pro- and meso- 
sternum, and also in the absence of lobes on the under surface of the tarsi; in the 
Atopide we know already that the latter is a variable character, and there 
appears to me no good reason why the two families, Atopide and Rhipicidere 
should not be merged together. The synonymy of the only species of Zenoa 
known to me is: 
Z.picea Lec. Journ. Acad. Nat. Sc. New Ser. 1, 89. Melasis picea Beau- 
vois, Ins. 7, tab. 7, fig. 1. Sandalus (Zenoa) picea Say, Bost. Journ. Nat. 
Hist. 1, 152. Zenoa vulnerata Lec. loc. cit. 
Middle and Western States: the last synonym belongs to a variety with the 
thorax partly red. 
Cerophytum is usually placed in the vicinity of these genera, and has been 
bandied about between FEucnemides, Rhipiceride and Cebrionide; it must, 
however, belong to the latter family. The great development of the trochanters 
entirely separates the femora from the coxe; the same structure is to be found 
in Cebrio bicolor, although the trochanters are not so long; the indistinct 
labrum and globular anterior coxe also place it with Cebrio, while the whole 
form of the head, as well as the general appearance, would separate it from the 
Eucnemides, which, as I have already observed,* should be considered as a 
group of Elateride. ‘The small mandibles and lobed tarsi are certainly very 
different from those of Cebrio, but we know that the latter character is merely 
of generic value in both Elateride and Atopide. The description of Haldeman 
is Incorrect as regards the posterior feet, in which the cove are said to be very 
* Proceedings of the Academy or Natural Sciences, 6, 45. 
