NATURAL HISTORY WORK IN CART AGO 67 



is longer and stouter, not so strongly curved backward so 

 that it by no means reaches the interval between the pro- 

 thoracic prongs and is notched at the tip. The prothorax 

 rises into a projection which at its summit divides into a 

 right and left prong, widely separated from each other by a 

 straight edge. While we found no female of this species, 

 we have seen specimens collected in Panama by Mr. G. C. 

 Champion. Her head has a minute point on its upper sur- 

 face to represent his horn, her prothorax is convex but not 

 elevated and two very small points, near its fore edge, close 

 to the middle line and about Vie o^ ^n inch apart, may cor- 

 respond to his prongs. 



The male of the giant Perseus beetle {Dynastes perseus) 

 also of this family, one individual of which lived as our 

 boarder, as related on another page, has also developed a 

 cephalic horn and a prothoracic process or horn. The length 

 of the body exclusive of the horns is three inches, the head 

 and prothorax are blackish, the wing-covers green pitted 

 with black. 



This Central American Perseus has been confused with the 

 South American Hercules which is still larger and has three 

 teeth on the upper surface of the cephalic horn instead of 

 two. We have not seen the female of Perseus but the female 

 Hercules is of a dull brown throughout, has a small point 

 (not a twenty-fifth of an inch high) on the top of the head, 

 no projection of any kind on the prothorax and the surface 

 of her wing-covers is finely netted, quite unlike the elytra of 

 her partner. She is about two and one-half inches long. 



Quite a different arrangement of the horns exists in Strat- 

 egus julianus which also came to the electric lights of Car- 

 tage in May. This beetle is i^ inches long, its head and 

 prothorax blackish-brown, almost black, the wing-covers a 

 rich deep mahogany-brown, the last smooth and polished 

 but with some discontinuous longitudinal scratches, and a 



