482 CASEY 



eyes coarsel}'" faceted, though flattened and widely separated 



above, as in Nosodermini, and so constantly covered by the 



prothorax that it is very rarely an example can be found, in which 



they are even partially observable. The large deep antennal 



fossae are at the sides of the prothorax, wholly invisible from 



below and also invisible from above anteriorly, though broadly 



and dorsally exposed and enlarged posteriorly. The antennas 



are short, thick and compact throughout, the last three joints 



wider. The tribe is confined to the true Pacific coast fauna 



and there is but a single genus, which can be defined as 



follows : — 



Body oblong-oval, moderately depressed, the mouth-parts small; 

 mentum very small, completely exposing the maxillae at the sides 

 and the ligula in front, parallel at the sides in basal half, trape- 

 zoidal in front; ligula small, narrow; palpi slender and small in 

 size, the last joint of the maxillary elongate-fusiform, as long as 

 the two preceding combined, obtusely pointed and hollowed at 

 tip, the basal joint minute ; mandibles slender apically, deeply 

 bifid at tip, the lobes very acute, the upper but little the longer ; 

 antennae short, stout, 11 -jointed, the basal joint smaller than the 

 second and deeply seated in the antennal fovea, the second as 

 long as the next two combined ; epistoma short, broadly truncate, 

 the labrum short and transverse, truncate ; scutellum minute, 

 forming a long and very slender pointed wedge between the 

 elytra, the latter moderately inflexed, without true epipleurae but 

 but with tlij inflexed surface rapidly broadening, flat and marked 

 externally by a rough subcariniform line toward base ; meta- 

 sternum about as long as the first ventral, the episterna extremely 

 narrow and Imear ; ventral sutures all very coarse and deeply 

 excavated throughout, the fifth segment with a large and moder- 

 ately deep, transverse impression, interrupted at the middle, the 

 lateral margin of all the segments narrowly tumescent and sepa- 

 rated from the rest of the surface by a fine deep sulcus, which 

 is obsolete only at the extreme apices of the segments ; coxce 

 rather widely separated, the anterior acetabula surrounded by an 

 ambient prosternal gutter, the intercoxal process short, horizontal, 

 free, widely truncate, with its median part between the gutters 

 excavated and slightly more advanced posteriorly ; legs rather 

 short and moderately stout, the tibial spurs obsolete or excessively 

 small, the tarsi short but slender, with stiff inclined hairs beneath, 

 the basal joint of the posterior as long as the next two combined 

 and a little shorter than the fourth, the claws rather small and 

 slender. [Type U. lacerta Mots.] Usechus 



The above description is very detailed, as I am unaware of 

 any even passably full diagnosis of this remarkable genus. 



