Coleopterological Notices. 319 



thick acute bead. Scutellum moderate, very distinct, almost circular. Ehjtra 

 subequal in width to the prothorax and twice as long, gradually rather 

 strongly rounded at apex, the sides anteriorly very feebly arcuate ; base 

 equal in width to that of the prothorax ; disk with rows of very coarse punc- 

 tures which become feeble near the sides and almost completely obliterated in 

 apical third or fourth. Under surface extremely sparsely and inconspicuously 

 punctate, polished. Legs short, the femora rather robust. Length 1.8-2.0 mm. 



California (Humboldt Co.). 



I obtained two specimens of this extremely interesting species 

 under old bark near Humboldt Bay. 



BOTRODUS n. gen. (Murmidiini). 



Body oblong-oval, rather strongly convex. Head defiexed, the trophi parti- 

 ally concealed in repose by the moderately developed prosternum. Eyes rather 

 large, rounded, coarsely faceted. Antennae inserted at the sides of the front 

 in very small fovese adjacent to anterior margin of the eye, 10-jointed, the club 

 moderate in size, abrupt, oval, solid and consisting of two amalgamated joints ; 

 basal joint rather large, broadly angulate anteriorly ; second much smaller, 

 conical ; three to eight slender, very compactly joined, affixed obliquely to the 

 apex of the second joint ; antennal grooves wanting, the club received in a 

 small deep excavation in the apical angles of the prothorax, visible anteriorly 

 but not from above. Palpi not very robust, the last joint slender, acuminate, 

 conical and slightly oblique, in the maxillary nearly equal in length to the 

 penultimate and a little more slender. Mentum extremely small. Mandibles 

 finely notched at apex. Labrum very short and transverse. Epistoma ex- 

 tremely large, fully one-half as long as the entire head and continuous with it 

 in convexity, the suture very fine and extending between the antennal foveae. 

 Anterior coxae very small, globular, very distant, the cavities apparently open 

 behind, the prosternum witli two very fine widely distant lines, diverging from 

 the coxae, the process very wide, extending under the mesosternum. Meso- 

 sternum between the coxae very broad, advancing anteriorly beyond the coxae 

 as a broadly rounded, heavily beaded lobe, which extends partially over the 

 prosternum, the metasternal suture very feeble. Metasternum very large, the 

 episterna narrow, inflexed behind to meet the coxae ; suture very feeble ; 

 posterior coxae small, transversely oval, widely separated. Abdomen consist- 

 ing of five segments with straight, rather feeble sutures, the basal segment 

 not quite as long as the remainder together. Legs rather short, not received 

 in excavations, the femora robust, extending laterally beyond the sides of the 

 elytra ; crural cavities perfectly obsolete but represented by feebly elevated 

 lines, extending obliquely on the metasternum and first ventral segment, from 

 the inner limits of the coxae. 



This genus has several characters in common with Mychocerus, 

 such for instance as the position and extent of the antennal excava- 



