558 Coleopterological Notices, VII. 



and symmetric ; pronotal sulcus continued down the flanks as 

 in Melba ^ZoliuiU 



Elytra without trace of a post-humeral fovea, frequently having a fine 

 oblique pleural line proceeding from a point on or near the side 

 margin to the apex, which line may or may not be homologous 

 with the elevated carinal line of Actium and allies ; elytra without a 

 discal stria, but having a large, more or less elongate and rapidly 

 attenuate basal impression. 

 Prothorax narrowed at base but unconstricted ; abdomen not con- 

 stricted at base. 

 First dorsal segment much elongated. 

 The first dorsal deeply impressed at the middle of the base ; pro- 

 notal sulcus not continued down the flanks, but ending ab- 

 ruptly in small nude enlargements near the margin. 



*Triiiiium 



The first dorsal without trace of a median depression ; body 



shorter and stouter ; pronotal sulcus continued down the 



flanks as in Melba Triiniomelba 



First dorsal shorter, equal in length to the following, not impressed 



at base ; pronotal sulcus continued down the flanks 9Iel1)a 



Prothorax deeply constricted at the sides before the base ; abdomen 

 feebly constricted at base, the first dorsal slightly elongate ; prono- 

 tal sulcus as in Melba Dalmosella 



Last joint of the maxillary palpi not, or but slightly, larger than the 

 third ; cephalic fovese elongate but not connected ; prothorax apparently 



as in Trimium ; dorsal sagments subequal [Brendel] Basoluni 



Ninth and tenth joints larger, much less transverse and symmetric, the 

 eleventh relatively not so large ; elytra with a discal stria. 

 Elytra with two basal fovese but without post-humeral fovea, the prothorax 

 toward base as in Trimium ; first dorsal and second ventral elongate, 



not modified at base Trimioplectus 



Elytra with three basal fovese. Zanzibar * Periplectus 



Antennae 10-jointed, the ninth produced and acuminate internally. Singa- 

 pore *Propliilus 



This particular group of trimiiform genera appears to be much 

 more abundant and structurally diversified in the American con- 

 tinents than in the old world, and will prove to be very extensive, 

 as the species have been but seldom collected hitherto owing to 

 their minute size and secluded habits. 



Remarks. 



Actium Csy. — This genus will include californicum, poliium, 



robustulum, testaceum, candidum, marinicum, pacijicum, brevi- 



penne, glohifer, paraholicum and the two species described below. 



It is much better represented on the Pacific coast than in the At- 



