436 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Relationships. — There is no doubt but that marginata and scah- 

 Ticula are closely related, and have undoubtedly diverged from a 

 common ancestral form within recent times. The more obscure rela- 

 tionships of 'plani'pennis have been referred to elsewhere. 



Distrihution. — Discogenia is a subgenus peculiar to California and 

 extends eastward into the Sierra Nevada Mountains as far as I^ake 

 Tahoe (elevation 6,280 feet), possibly into western Xevada; in 

 Alpine County to an altitude of 7,000 feet (Blood's meadow). 



I do not consider planipennis as a normal constituent of the pres- 

 ent subgenus; if it should prove to be, then it must be considered as 

 an eastward modification. In the latter case the first statement will 

 have to be altered. AVhen the obscure question of relationships shall 

 have undergone greater solution, then we will be able to speak more 

 intelligently upon this problem. 



Thus far I have only seen specimens of marginata from the mari- 

 time regions of central and northern California. The nucleus of 

 distribution seems to be about the Bay of San Francisco. 



Sicabvicula is both montane and submaritime, evidently confined 

 "chiefly to central California, and undoubtedly extending more or 

 less north and south of this central region. 



Planijjennis has only come to me from Arizona, New Mexico, and 

 Colorado. 



ELEODES MARGINATA Eschscholtz. 



Eleodes marginaia Eschscholtz, Zool. Atlas, III, 1833, p. 10. — Manner- 



HEiM, Hull. Soc. Nat. Moscow, XA'I, 1843, p. 268.— LeConte, Proc. Acad. 



Nat. Sci. Phila., 1858, p. 182. 

 Eleodes fisckcri Mannerheim, Revue Zool., Ill, 1840, p. 137; Bull. Soc. 



Nat. Moscow, XVI, 1843, p. 269. 

 Discogenia marginata LeConte, Suiithsou. Miscell. Coll., No. 167. 1S66, 



p. 117.— Horn, Traus. Anier. Tliil. Soc. XIV, 1870, p. 320. 



Black, oval, and more or less elongate. 



Head twice as wide as long, equal to one-half the width of the 

 prothorax, plane to feebly convex, shining, more or less impressed 

 laterally near the frontal suture, sparsel}^ punctate, confluently so 

 at the sides. Antenna? reaching to the posterior fourth of tlie ]^ro- 

 thorax, outer joints gradually and feebly dilated ; the third about 

 three times as long as the second; fourth twice as long as the same; 

 fifth, ninth, and tenth subequal; sixth, seventh, and eleventh equal in 

 length and slightly longer than the fifth. 



Pronotum feebly shining, widest at the middle, about two-fifths 

 wider than long; disc evenly and not strongly convex, rather coarsely, 

 irregularly, at times confluently punctate, laterally not broadly and 

 very feebly impressed, and there scabrous from minute granules; 

 apex moderately and evenly emarginate, finely margined; sides 



