OF WASHINGTON, VOLUME XV, 1913 191 



Cherostus cornuius (probably in error) 1 from Oaxaca and Durango. 

 He contends that the resemblance to Eledona is not deceptive but 

 genuine, and refers the group again to the Tenebrionidse as an aber- 

 rant group allied to the Boletophagini. 



1910 BLATCHLEY (Coleop. of Indiana p. 901) includes Rh. parm/usu* in the 

 Cioidse and gives sexual differences in the antenna 1 , but records its 

 occurrence under bark of oak stumps, rare. 



1911 GEBIEN (Coleop. Cat. Tenebrionidtc III. p. 362) lists six species of 

 Rhipidandrus, five species of Cherostus and three species of Eledona as 

 forming the Rhipidandrini, but he omits two species viz. peninsularis 

 Horn 1894 and sulcatus Gorham 1898, and does not refer to paradoxus . 

 (Beauv.). The latter appears as flabellicornis Sturm, a name that 

 has been replaced (perhaps wrongly) by Beauvois' name for forty 

 years in the American literature. 



Although the generic nomenclature appears simple, the writer 

 believes that an error has been made in accepting Lacordaire's 

 generic name Eutomus as a synonym of LeConte's genus. The 

 former's type species is unknown to the writer but its description 

 seems to apply to a species more nearly resembling Cherostus cor- 

 nutus Arrow (which was formerly recorded as micrographus Lac.) 

 than to LeConte's genus Rhipidandrus. The erection of Cheros- 

 tus by Waterhouse for two oriental species may be justified, but 

 the American species are believed to belong in Eutomus. 



In regard to the biology, we have only the description of the 

 larvae by Friedenreich (1883) translated by Arrow (1904), and 

 numerous statements that they are found in hard woody fungi. 

 In the experience of Mr. Schwarz and the writer Eutomus is usu- 

 ally in company with a brown species of Arrkenoplita. 



From the following six species, represented in the National Col- 

 lection, it appears that Rhipidandrus, type flabellicornis (Sturm. 

 1826) Lee. 1862, has the antennal rami produced into flabellse, 

 and is devoid of frontal sexual characters, while in Eutomus, type 

 micrographus Lac., 1866, the antennal rami are much shorter, so 

 that when closely appressed the antennae appear clavate and not 

 flabellate, and the frontal sexual characters consist of a pair of 

 clypeal tubercles in the male and a more or less pilose frontal con- 

 cavity in the female. No oriental species of this group are before 

 the writer, but since Arrow (1904) adopted Wuterhouse's genus 

 Cherostu*, type walkeri Waterh. 1894, for his West Indian species, 

 here called Eutomus cor nut us, it is believed that the former genus 

 will fall as a synonym of the latter. 



1 There is great probability that this is identical with Horn's Rh. penin- 

 sularis but not with Arrow's Ch. conutlux from the West Indies. 



