of Lucanoid Coleoptera. 47 
Upon a recent visit to several of the chief collections of Cole- 
optera on the continent, I ascertained that Dorcus Tilyus was 
there represented as being the D. Chevrolati, Hope, Ann. Nat. 
Hist. xii. 364, and Cat. pp. 20 and 6; this is evidently erroneous, 
the type of D. Chevrolatii, which is now before me, proving to 
be a var. max. of Dorcus Saiga, Olivier. There ought to be no 
mistaking the two species, according to the description of the 
mandibles of D. Chevrolatii, “ arcuatis, in medio intus lato dente 
armatis, et pone hunc setosis” (vid. Cat. p. 20). This last cha- 
racter is not alluded to in the description of D. Tityus ; it most 
decidedly does not exist in the insect itself, and is peculiar to D. 
Saiga, D. cribriceps, Chevr., and D. purpurascens, Voll., all three 
species belonging to the genus Lurytrachelus of Mr. ‘Thomson, 
Having examined the type specimen of E. semirugosus, Thom- 
son, Cat. p. 422, I have no hesitation in regarding it as the var. 
min. of #. Tityus. 
EurytracHetus Tuomsont ¢, Parry. 
E. niger, tenuiter granulatus, subopacus, depressus; capite 
lato transverso, antice depresso, emarginato, tenuissime gra- 
nuloso, pone oculos inflato ; mandibulis intus ad basin excisis, 
capite duplo longioribus, gracilibus, leviter curvatis, spinis 
duabus parvis obtusis, una ad basin alteraque prope medium 
instructis ; clypeo prominulo, transverso, antice emarginato, 
obtuse bidentato ; prothorace transverso, capite latiori, lateri- 
bus pone angulos anticos sinuatis, angulis posticis obtusis, 
linea media longitudinali laevi notato ; elytris dorso lzevissimo, 
prothorace angustioribus, disco nitido, sublente punctulato, 
lateribus subtilissime coriaceis, subopacis, angulis humeralibus 
productis; tibiis brevibus, anticis extus irregulariter den- 
ticulatis, quatuor posticis inermibus. 
Long. corp. lin. 13 ; mandib. lin, 6. 
Hab. Ins. Moluce. 
The present species was collected by Mr, Wallace, and is allied 
to E. Ceramensis, Thomson (vid. Cat. p. 424), but which is pro- 
bably identical with D. concolor, Blanchard. The general colour 
of E. Thomsoni is of a somewhat polished black (and not, as in 
Ceramensis and concolor, rufo-piceous), with the dise of the elytra 
remarkably shining, contrasting strongly with the remainder of the 
insect ; whereas, in the allied species alluded to, the colour of the 
insect is uniform, the sculpture being granulose and opaque. The 
tibice appear also to be shorter, with the tarsi more slender; the 
