AMERICAN COMPONENTS OF THE TENTYRIIN^ 34I 



punctures bearing long, suhercct, fulvous hairs ; abdomen pol- 

 ished, feebly rugulose, rather coarsely but sparsely punctate. 

 Length S.o mm.; width 2. 8 mm. Lower California (San Jos6 

 del Cabo) cribratus llorn 



Another species, differing apparently in its slightly less coarse 

 sculpture and shorter pubescence, was also described by 

 Dr. Horn from the same locality under the name crostis. I owe 

 the single specimen of cribratus in my cabinet to the kindness 

 of Mr. Charles Fuchs, of San Francisco. 



Ditaphronotus n. gen. 

 The chief peculiarity of this genus is the remarkable excava- 

 tions at the base of the pronotum, with which no analogy can 

 be found in the subfamily, except perhaps in the still more 

 extraordinary cavity characterizing Dacoderus. These crev- 

 asses, in the typical forms, are right-angled in shape, extending 

 longitudinally to the basal margin and then along the latter 

 toward the middle for a short distance and are very deep. With 

 this singular character we have also another, rather exceptional 

 in the subfamily, formed by, the complete absence of the raised 

 basal margin of the elytra, the acute line delimiting the epi- 

 pleuree being simply turned inward for a short distance at the 

 humeri, and, perhaps correlated to some extent with this char- 

 acter, there is an abrupt basal abbreviation of the sixth to ninth 

 series of punctures. The basal joint of the hind tarsi is unusu- 

 ally elongate, almost equaling the remaining three joints com- 

 bined, and all the tarsi are clothed beneath with very stiff and 

 subdecumbent spiculiform hairs. The eyes are prominent, 

 moderately emarginate, the frontal margin evenly arcuato-trun- 

 cate from a vertical viewpoint, but with the median part deflexed, 

 forming a very feeble lobe when viewed longitudinally. The 

 mandibles are very stout, bifid at tip, the left \vith a very obtuse 

 dorsal tooth, the right with a large pointed and porrect denti- 

 form projection on the upper surface, clasping the labrum. 

 The metasternum in the typical species is a little shorter than 

 the first ventral segment and the hind wings are probably ves- 

 tigial. A typical species may be described as follows : — 



Form oblong-oval, only moderately convex, glabrous, alutaceous in 

 lustre, more shining beneath, black, picescent beneath, the legs 



