A. II. Verrill — New Species of Dynastes. 31 Y 



Art. XXVIII. — Descriptions of ttvo remarkable new species 

 of Goliath Beetles (Dynastes) from Dominica Island, 

 Antilles — Brief Contributions to Zoology from the Museum 

 of Yale University, No. LXY1 / by A. Hyatt Verrill. 



Dynastes tricornis sp. nov. 



Male. — Elytra, thorax, and head polished, deep purplish 

 black with no hair except along the edges of the segments, 

 where the hairs are short, sparse, and rusty or ferruginous 

 red ; ventral surface highly polished, deep brownish black with 

 very few sparsely distributed reddish hairs along the edges of 

 the segments. Legs stout, black, and smooth, except along the 

 tibiae of the anterior pair, which are deeply but minutely 

 pitted ; tarsi and tibiae edged with fine reddish hairs ; processes 

 of tibiae very similar in form to those of D. Hercules. Dorsal 

 outline of elytra broad, obtuse, and slightly compressed later- 

 ally at a point about one-third the distance between the ante- 

 rior and posterior extremities. 



Thorax shield-shaped in a dorsal view ; concave in a lateral 

 view and bearing three slender, smooth, curved, processes or 

 " horns." The three horns are arranged in a triangle with the 

 two posterior ones forming its base and curving forward and 

 inward toward the third process, which forms the apex of the 

 triangle ; the anterior processes rounded below and flattened 

 above, somewhat thickened near the center and curved semi- 

 circularly upwards at the outer end. JSTo hairs on any of the 

 thoracic processes. 



Head minutely pitted and without appendages of any sort, 

 except a small, slightly raised, transverse ridge between the 

 eyes. Lateral posterior edges of the thorax below appendages 

 and upper surface of anterior appendage minutely pitted. 



Length from anterior extremity to tip of abdomen (exclu- 

 sive of thoracic process), l - 45 inches ; width of thorax at pos- 

 terior segment, 0*60 ; width of thorax at widest point (across 

 two posterior processes), 0*70 ; width of thorax at anterior seg- 

 ment, 0*25 ; width of elytra at widest point, - 85 ; length of 

 two posterior thoracic processes, 0*35 ; length of single anterior 

 process, 0*45. 



Habitat. — Highest mountain slopes of the island of Dominica. 



Several specimens. Female unknown. 



As will be seen by the foregoing description, this new 

 Dynastes is very distinct from any other species of the genus. 

 Its small size, three thoracic and no occipital appendages, as 

 well as its polished and uniformly colored surface are charac- 

 ters which serve to identify it at a glance. 



