320 A. II. Yerrill — New Species of Dynastes. 



The thoracic " horn " is much more curved and has the two 

 lateral projections much nearer base than in D. Hercules. 

 Occipital horn slender near base but wide vertically from a 

 point near middle to near the anterior end ; compressed later- 

 ally, broad in profile, but slender when viewed anteriorly, in 

 marked contrast to the occipital appendage of D. Hercules, in 

 which species the occipital " horn " is fully as wide anteriorly 

 as laterally, and nearly circular in section. 



Protuberances on occipital appendage three in number and 

 of almost equal size and equally spaced between anterior 

 extremity and middle of the " horn." 'No indication of a 

 bifurcated tip to the occipital appendage, as is usually the case 

 with D. Hercules. Anterior profile outline of occipital process 

 almost straight, not convex as in D. Hercules. Thorax broader, 

 more depressed, ayd less conical in dorsal outline than in Her- 

 cules. Elytra broader, more obtuse posteriorly, and more con- 

 vex in profile than in D. Hercules. Color of elytra uniform, 

 dark, sooty-brown, occasionally with indications of circular or 

 lunate markings of a lighter, more yellowish shade. Lower 

 parts lighter and more brownish than in Hercules, with more 

 abundant and lighter colored hair ; especially on ventral sur- 

 face of the head and thorax. Dorsal portion of thorax, espe- 

 cially posteriorly, much rougher aud more deeply pitted than 

 in D. Hercules. 



Length, from anterior extremity to tip of abdomen, exclusive 

 of thoracic appendage, 2*60 to 2*65 inches ; dorsal length of 

 thoracic appendage, 1*40 to 1*50 ; anterior length of occipital 

 appendage, 1*06 to 1*10 ; width of thorax at posterior segment, 

 1-15 to 1-20 inches. 



Habitat. — Windward or Atlantic slopes of Dominica. Three 

 specimens. Female unknown. 



