18G DESCRIPTIONS OF NEW SPECIES. 



B. Prothorax cylindrical, sides nearly straight ; 



a. 3d joint of antennae with spine a little longer than that of the 



following joint ; palpi with last joint not dilated; 

 Elytra emarginate at tip, slightly bispinose, flying hairs of tibiae long, not 

 very numerous. 2. linearis. 



b. 3d joint of antennae with the spine much longer ; 



Elytra emarginate at tip. flying hairs of tibiae not conspicuous, palpi with 

 last joint not dilated. 3. tenuis. 



Elytra truncate at tip, suture more prominent, Hying hairs of tibiae long, 

 numerous ; palpi very unequal, with last joint triangular, dilated ; (an- 

 tennal carina? obsolete). 4. volitans, n. sp. 



1. A. p)rotensus, Elaphidion prot. Lee, Proc. Acad. Nat. Sci., 

 1858, 82. Arizona. 



2. A. linearis, Elaphidion lin. Lee, ibid. 1859, 80. Cali- 

 fornia. 



3. A. tenuis, Elaphidion tenue Lee, ibid, vii, 81. Texas and 

 Arizona. In this species, as in the preceding, the palpi are not 

 dilated and not very unequal; the hind tibiae are, however, much 

 more distinctly carinated ; the spine of the 3d antennal joint is 

 two-thirds as long as the 4th joint, and the spine of the latter is 

 quite small. 



500. A. volitans. Fuscus, parce longe pallide pubescens, prothorace 

 latitudine longiore confertim punctato, lateribus late rotundatis ; elytris 

 fortiter punctatis, apice truncatis, sutura prominula ; tibiis pilis volati- 

 libus longis, conspicuis. Long. 10 mm. 



One female, Cape San Lucas, Mr. Xantus. In this species as 

 in A. protensus, the first joint of the antennae is longer and less 

 thickened than in linearis, and slightly curved ; the outer joints 

 ai*e scarcely carinate, the spine of the 3d joint is two-thirds as 

 long as the 4th joint, and the spine of the latter is also long, 

 being fully one-third as long as the 5th joint. The palpi are 

 very unequal, and the last joint is triangular and much dilated. 

 The hind tibiae are only feebly, and hardly perceptibly carinate. 



EIJSTBOMA Leg. 



This new genus is founded upon Elaphidion validum Lee, 

 Pro. Acad. Nat. Sci., Phila. 1858, 82, which occurs in Texas, Ari- 

 zona, and Lower California. It is allied to Elaphidion, but dif- 

 fers in having the antennae shorter and stouter, with the outer 

 joints compressed, sericeous pubescent ; the lower joints are 



