198 Journal New York Entomological Society. t^'"'- x.wi. 



Tenebroides arizonensis new species. 



Elongate, moderately depressed ; color rufo-piceous, elytra with distinct 

 brassy tint. 



Head rather finely and sparsely punctate; eighth antennal joint oval. Pro- 

 thorax transverse ; anterior angles broad and rather moderately produced ; 

 lateral margin arcuate, moderately convergent posteriorly ; basal angles obtuse, 

 acute and very feebly produced; basal marginal head broadly interrupted at 

 middle ; surface somewhat coarsely punctate at sides, punctures a little smaller 

 and less close at middle. Elytra oblong-oval ; punctures of the regular series 

 moderately large ; punctures of the intervals very fine and mostly obliterated ; 

 surface with short, transverse or oblique impressions as in rugosipennis. 

 Prosternum, metasternum and ventral segments sparsely and rather finely 

 punctate. Length 5 mm. ; width 2 mm. 



Arizona. 



A single specimen, apparently a female, in the O. Dietz collection, 

 which I had placed with rugosipennis. It is very close to that species 

 in form, color and elytral scnlpture but the prothorax is not as 

 strongly arcuate at sides as in that species, the posterior angles are 

 distinct and acute, the basal marginal bead is broadly interrupted at 

 middle, the under surface is shining with fine punctuation and the 

 maxillary palpi are narrower and more elongate than in rugosipennis. 



Tenebroides americanus psp. laticollis Horn. 



T. laticollis differs from typical americanus in the relatively larger 

 head, shorter and more transverse prothorax, clearer elytral sculpture 

 with the punctures of the intervals mostly always small and the punc- 

 tuation of prothorax and underside generally finer. It is also smaller 

 than amcricanns. It is almost entitled to specific standing but in the 

 absence of a distinct, strong and independent character and the posses- 

 sion of the same unique, secondary male character and the antennae 

 with the sensitive spaces formed as in americanus I prefer to place it 

 as a subspecies of the latter. 



Tenebroides sonorensis Sharp. 

 T. dcbilis Fall. 



Through the kindness of Mr. Arrow I received from the British 

 Museum one of the three typical specimens from which Dr. Sharp 

 described his sonorensis and from Mr. Fall a specimen of his dcbilis 

 which enabled me to settle the synonymy without a doubt. 



The shape of prothorax and punctuation in this, as in many of the 

 other species differ considerably. 



