[May 1884. BULLETIN BROOKLYN ENTOM. SOC. VOL. VII. 11 
male. The sensitive pores commence on the outer half of the 3d joint, 
and cover the whole surface of the 4th and following joints, arranged in 
longitudinal grooves, separated by fine elevated lines, The narrow epi- 
pleural portion of the elytra is transversely striate, forming a stridulating 
organ upon which the edges of the hind femora grate to produce a sound. 
The 5th segment in the (J is broadly emarginate, the 6th visible and 
also emarginate, while in the Q the 5th segment is elongate and truncate 
but the 6th is not visible. 
The species are seperated as follows: 
Hind femora sparsely punctured; prothorax with three acute teeth........ brevicollis. 
Hind femora densely punctured; anterior tooth of prothorax double, some— 
tions Ghinicleal on eo ce bao et meeeEee oo bods God sh cous ae mene ao geminatus. 
D. brevicollis Serv. Ann. Fr. 1832, p. 155; Hald Trans. Am. Phil. X, 1847, 
Paste Catesdicdapa 343% 
The head and thorax are black, body testaceous brown; legs testa- 
ceous knees black. Elytra with three slightly elevated ridges. Length 
2 to 2 25 inches, 52—58 mm. //ad. Southern States. 
D, geminatus Lec, Proc. Ac. Phil. VI, 1853, p. 233; Col. of Kans. 1859, p. Io, 
thy 7 alee, ids Oe 
This species is easily distinguished, not only by its large size, but 
also by the double anterior tooth of the thorax. The elytra are entirely 
smooth except at the base, where a few indistinct ruge are visible. Pectus 
covered with short yellowish hair. Length G‘1.5 to 2 25 inches, Q 2.5 
to 2.9 inches, 62—75 mm. //ad. Texas to Lower California. 
ORTHOSOMA, »". 
This genus is represented by a single species: 
0. brunneaum Forst. Nov. Spec. Ins. 1771, p. 37; cylindricum Fab. Spec. Ins. I, 
p- 207; Oliv. Ent. IV, 66, p. 23, t. 1, fig. 6; eylindroides Gmelin ed. Linn. I, p. 4, 
1818; pennsylvanicum De G. Mem. 1775 p. 99. t. 13, fig. 13; sulcatwm Beauv. Ins. 
Afr. et Am. p. 526, t. 35, fiz. 4; wnicolor Drury, Ill. I, 1773, Ind. I, p. 83, t. 37, 
fig. 1; Casteln, Hist. Nat. II, p. 402. 
The characters of this species are the same as given above for Dero- 
brachus and in the table of genera ‘The prothorax is tridentate and the 
color is light brown. Sexual differences may be found in the antennz as 
in Derobrachus and in the 5th ventral segment, which is rounded in the 
Q, but broadly truncate in the ({\ leaving the 6th visible. The beetle is 
common everywhere in the Atlantic States, from June to September, and 
is attracted to light. The larva is said to live in the rotton stumps of pine 
(Pack. Guide 495, f. 478) and is credited also with eating into the roots 
of grape vines and sometimes destroying them. Length .go to 1.75 inch., 
22—40 mm. Aad. Atlantic States. 
