| November 1882. | BULLETIN BROOKLYN ENTOM. SOC. VOL.V. 49 
Synopsis of the Lucanidae of the U.S. 
By Cuas. Fucus. 
The insects of this family live on the sap of trees, such as beech, 
maple and oak. and pass through their transformation in decaying wood. 
Closely related to the Svaradide this family can be readily separated from 
it by the antennal club, which in the Svaradide is lamellate or leaf-shap- 
ed and movable, while in the Lucanid@ it is merely pectinafe or comb- 
toothed, and comparatively immobile. a 
THE GENERA MAY BE DISTINGUISHED AS FOLLOWS: 
Mentum entire, ligula enlogated, behind or at the apex of the mentum. 
Antennze geniculate; anterior coxee approximate. 
Elytra smooth or obsoletely striate (in megama)........ Lucanus. 
Elytra striate and punctate. : 
Eyes decidedly notched by the margin of the head...... Doreus. 
eneseGatcely, OF Not at cll notchedWasy 3) +e. -.57'-\- Platycerus. 
Antenne straight, anterior coxa contiguous. 
Body moderately convex, head of (J as broad as thorax, elytra striate 
; Naciimtenvals’ punctured... . zee Rapecalh ayn de noe ON Ceruchus. 
Body cylindrical, head much narrower than thorax, elytra rugose. 
Sinodendron. 
Mentum deeply emarginate, ligula broad, filling the emargination. 
Passalus. 
Lucanus, Zz. 
Memaibles ol (vas long as\ abdomen... aha... 22.) - 1 2s. elaphus. 
‘Mandibles of (J as long as the thorax. 
Mandibles with one tooth at middle. 
Elytra smooth, femora yellow or reddish, head of ¢ broader than 
MOT OSE EMI Le... MMMM RE eC, Std ee arate eee dama. 
Elytra finely punctulate, femora black, head of §/ not broader than 
Mle recent op sts shore ec « «| « A EMEREMaGe! si vere. Se arate mazama., 
Mandibles (J with several, Q with two teeth, head of ({1 not narrower 
RUTeRETAUIRON Tone een MM leo... Romane cre oe Tad EER aa placidus. 
a elaphus, Babwoysty emt, ps2) Oliviemmimty I 2st. 3) if. 07.¢U7 gees, 
(var.) De Geer. Mem. Ins. IV, 33, americanus, Hope Cat, Luc. p. Io. 
The is easily distinguished by the. very long mandibles; the Q differs 
