AMERICAN ENTOMOLOGY. 9 



in which the appearance of a considerable number of them occa- 

 sioned no little surprise in the neighborhood where they were 

 discovered. A mile or two southward of Philadelphia, and near 

 the river Delaware, an old cherry-tree was blown down by a 

 violent current of wind, and my informant saw the remains of nu- 

 merous individuals, in and about a cavity of the tree, laid open 

 by the shock of its fall. That there might be no mistake as to 

 the species, he exhibited the thorax of a male he had chosen 

 from the mutilated fragments. > 



I think it highly probable that the Tityus is more especially a 

 native of the Southern States, as my friend, Mr. J. Gilliams, 

 presented me with several specimens in high perfection, collected 

 by himself in Maryland ; and from these, the drawings for the 

 annexed plate were made. 



The length of the male, exclusive of the horns, is two inches, 

 and the greatest breadth one inch. In color it resembles the S. 

 Hercules, being glaucous with brown spots, or brown with glau- 

 cous spots. These spots vary considerably in size, figure, posi- 

 tion and number, being sometimes confluent, and exhibiting a 

 clouded appearance. The elytra of one specimen in my collec- 

 tion are entirely chestnut-brown, immaculate, and the larger 

 thoracic horn frequently occurs simple or undivided at tip, as 

 exhibited in the figures given by Jablousky and Olivier ; to the 

 latter author we are indebted for a knowledge of the specific 

 identity of the Tityus and marianus. 



The female is generally somewhat smaller than the male, and 

 unarmed, except a small tubercle on the head. 



Tityus in the heathen mythology, was a gigantic son of Jupi- 

 ter and Elara, whom Apollo killed for offering violence to his 

 mother Latona. 



The upper figure of the plate represents the male, and the 

 lower the female. 



[This species belongs \o the genus Dynastes M'Leay. — Lec] 



ACRYDIUM. Plate V. 

 Generic character. Thorax elongated behind, often longer 

 than the abdomen ; elytra very small ; pectus with a cavity for 

 the reception of the inferior part of the head ; tarsi three-jointed, 

 destitute of pulvilli ; antennae thirteen or fourteen jointed, not 

 half the length of the body ; oviduct not exserted ; posterior feet 

 formed for leaping. 



