208 H. C. FALL. 



mens, they are probably all females, it is therefore not possible to 

 say if the carinate ventral is a sexual character ; I am quite confi- 

 dent, however, that it is not. The form of the antennal club is so 

 variable in the genus, that it would be mere guess work to predict 

 its form in the male of the present species. 



4. M. iugens n. sp.— Eobust, subcylindrical, convex, moderately densely 

 clothed with pale yellowish recumbent pubescence, intermixed throughout with 

 very short suberect hairs of the same color. Antennae ( %) with joints 1-8 as 

 usual, ninth and tenth narrowly triangular, about twice as long as wide, the 

 outer edge sinuate, the outer angle acute; eleventh distinctly longer, slender, 

 subparallel. the apex acutely rounded ; ninth and tenth joints united as long as 

 the entire stem. In the female the ninth and tenth joints are more broadly tri- 

 angular, about one-half longer than wide, the outer edge not or scarcely sinuate, 

 eleventh oval; ninth to eleventh united, barely equal in length to the stem. 

 Head finely closely punctate. Prothorax less obviously gibbous than in the pre- 

 ceding species; entire surface with larger punctures and granules, the interspaces 

 minutely punctulate. Elytra finely, moderately closely punctate, with numer- 

 ous larger punctures. Beneath moderately closely punctured, the punctures of 

 two sizes as above. Length 6.5-8 mm. 



California, San Diego (Blaisdell) ; Pasadena (Fenyes). 



This fine large species is quite distinct from all others of the 

 genus by its dual system of pubescence and punctuation. Two ex- 

 amples in the Horn collection bear the label frontalis, and it is 

 quite possible that both ingens and viduum may be present in other 

 collections under the same name. 



Dorc ATOM INI. 

 Broadly speaking, the members of the present tribe are distin- 

 guished from all others by their highly developed contractile power. 

 The antennae (except the basal joint) and oral organs are completely 

 shut in in repose, the head being strongly deflexed and received into 

 a deep cavity in the prothorax, and the legs are withdrawn into 

 appropriate excavations of the trunk. The form is usually broadly 

 oval, varying in one direction to elongate oval or oblong in Eupac- 

 tus and Petalium, and in the other direction to the rotundate form 

 of Ccenoeara. Head excavated beneath for the antennae or not. 

 Antennse varying from 8 jointed to"ll-jointed, the three outer joints 

 forming a conspicuous club of variable form, the intermediate joints 

 often very small and indistinct. The front coxa? are sometimes con- 

 tiguous, in which case the antennse are received between them and 

 the more or less impressed or excavated under surface of the head ; 



