628 Coleopterological Notices, VI. 



noticeably produced beneath. Bactrocerus contains a single 

 species from Lower California, which I do not have before me at 

 present; the pronotum is covered with coarse sparse and crescen- 

 tiform granulations, and has the vestiture coarse and sparse. 



RETOCOMl S n. gen. 



The North American species hitherto regarded as Eurj^genius,^ 

 differ so greatly from the South American type as defined b^^ La- 

 Ferte, that it seems impossible to avoid defining a distinct genua 

 to receive them, and for this the above name is suggested. In 

 the type of Eurygenius the eyes are not emargiuate and the 

 tempora are not at all prominent, besides many other differences,^ 

 notably in the organs of the mouth. LeConte and Horn state 

 that in Eurygenius murinvs — which is the only species which I 

 have not been able to examine, — the eyes are practicall}^ not 

 emarginate ; this species seems also, from the original description 

 of LeConte, to depart markedly in vestiture from the others, 

 and future study may possibly- prove it to be genericall}' distinct; 

 it occurs in Georgia and Alabama. In all the other representa- 

 tives the emarginatiou of the e3^es is deep and distinct, not essen- 

 tially differing in constrictus. 



Our species may be defined as follows : — 



Elytra each with five narrow vittse of fulvous pubescence ^vildi Lee. 



Elytra with uniformly colored pubescence, which is uneven in distribution. 



Species of the Atlantic region miirinus Hald. 



Species of the Pacific coast. 



Prothorax with a strongly developed arcuate apical lobe and a deep 



broad constriction; elytra vaguely subvittate coiistrictll$$ Lee. 



Prothorax ■^^-ith a smaller apical lobe and finer constriction; elytra 

 unevenly and sparsely marmorate with condensed white pubes- 

 cence, not at all subvittate. 

 Abdomen clothed with long shaggy pubescence, the elytra about 



twice as long as wide gratllS n. sp. 



Abdomen clothed with much shorter, more recumbent pubescence; 

 elytra distinctly more than twice as long as wide. 



decoTelliis n. sp. 



The two sexes of ivildi seem to differ a good deal in general 

 form, the male being smaller, more slender and with subcuuei- 

 form elj'tra ; in the female the elj'tra are broad and parallel. 



All the species which I have examined have the basal joint of 

 the hind tarsi strongly contorted at base, a character which is 



