AMERICAN' COMPONENTS OF THE TENTYRIIN^. 339 



gin, which is not at all biemarginate ; prothorax fully four-fifths 

 wider than long, only moderately narrowed and deeply sinuate at 

 apex, with the angles right, the sides evenly, moderately arcuate, 

 with the edges notably retlexed ; disk widest behind the middle, 

 rather coarsely, deeply and moderately closely punctate, the punc- 

 tures gradually but only slightly coarser though very dense later- 

 ally, forming long and interlacing longitudinal rugie ; scutellum 

 moderate, constricted at base, obtusely angulate at tip; elytra 

 three-fifths longer than wide, between three and four times as 

 long as the prothorax but not evidently wider, slightly dilated 

 posteriorly, gradually and rather obtusely ogival at apex, with 

 finely and feebly impressed series of somewhat coarse, deep and 

 close-set punctures, tliose of the intervals much smaller but dis- 

 tinct and unevenly uniserial ; abdomen extremely minutely, 

 sparsely punctate medially, highly polished. Length 6.2% mm.; 

 width 3.65 mm. Lower California marginatus Csy. 



In the four species of Locrodes from Utah, which form a 

 natural group, the secondary sexual characters become inter- 

 esting, especially those of the female, to which sex these sin- 

 gular characters seem to be confined in various parts of the 

 Tentyriin^, such as some Epitragids and in Telabis -punctulata^ 

 in opposition to a rather general rule in the Coleoptera and as 

 shown in the present subfamily in Triorofhns and some other 

 genera. All the species of the group referred to are defined 

 above from the female, where the last dorsal segment, normally 

 covered by the elytra, has at apex a very deep abrupt median 

 emargination, from the bottom of which projects posteriorly an 

 elongate, rapidly pointed and densely setose lobe, the last ven- 

 tral having at the middle of its fine reflexed margin a very small 

 abrupt and rounded sinus. In the male the last dorsal is simply 

 subtruncate at tip, but the last ventral has a feebler and broader 

 sinus, slightly protuberant at its middle and less sharply limited 

 at its sides than in the female, this community of modification of 

 the last ventral to both sexes reminding us of s the asexual exca- 

 vation in the Zopherini and Nosodermini. The setose lobe of the 

 female is rather constant in form in three of the four species de- 

 fined above, but in lahorans it becomes broader. LeConte de- 

 scribed longiiliis as apterous, but this is evidently not wholly true, 

 although the metasternum is not as long as in the last two sub- 

 genera or in Armalia ; the hind wings are in fact much abbre- 

 viated, as in such Mexican species as tcucbrosiis Champ. 



