3G 
GEO. H. HORN, M. D. 
tional species of Anatrichis, two from the East Indies, the third 
Australian. Four species are referred to Oodiellns, one from Mexico 
and three from Brazil. Mr. H. W. Bates describes as Anatrichis 
two more from Mexico which must be referred to Oodiellns, whether 
regai-ded as a section or a valid genus. The characters of the latter 
genus are derived entirely from the mouth parts and do not seem to 
be of sufficient moment for generic separation, as Mr. Bates has 
remarked, an opinion in which I fully concur. 
In his posthumous work Chaudoir fails to mention a character 
of the male of Anatrichis observ'ed by LeConte (Trans. Am. Philos. 
Soc. 1853, X, p. 391). The middle tibiae have on the inner side at 
the lower third an emargination resembling somewhat that of the 
front tibia. This character is not observed in the only male of 
Oodinus examined. It would be interesting to know what value this 
has, in addition to those given below, for the separation of Anatrichis 
and Oodinus. 
There is, however, one character more easily seen which will sepa- 
rate the species of the two divisions without, to my mind, having 
any greater weight than those u.sed by Chaudoir. 
As far as can be gathered from descriptions the species separate 
in the following manner: 
Elytral strife distinctly punctate S. G. Aiiali'icliis. 
Elytral strife fine and simple S. G. Oodinus. 
The former is represented in our fauna by A. minuta Dej., with 
shining, finely punctate surface, the basal impressions of the thorax 
deep but short. The apex of the prosternum is distinctly margined. 
The subgenus Oodinus is represented by two species. 
Form more broadly oval than A. minuta, surface more opaque; first and second 
elytral striae uniting at base, terminating together in an ocellate fovea ; 
prosternum not margined at tip l>icea Mots. 
Form oblong, recalling a diminutive Lachnocrepis parallela, surface shining; 
strife all partly obliterated at base, an ocellate fovea near the end of the 
second ; prosternum margined at tip obloiiga n. sp. 
The genus Anatrichis is properly considered feminine in its termi- 
nation by LeConte, Chaudoir and the Catalogus. Mr. Bates, how- 
ever, appears to regard it as masculine from his specific names. 
A. |>icea Mots. {Oodinus), Bull. Mosc. 1863, iv, p. 353; Bates, Biol. Cent. Am. 
Col. i, p 47, pi. Hi, fig. 11. 
mexicanus Chaud. {Oodiellus), Ann. Fr. 1882, p. 323 (partim). 
More broadly oval than minuta. The surface is less shining, without punctua- 
tion and extremely minutely aliuaceous ; the median line of the thorax is ex- 
