﻿of Lucanoid Coleoptera. 47 



Upon a recent visit to several of the chief collections of Cole- 

 optera on the continent, 1 ascertained that Dorcus Tityus was 

 there represented as being the D. ChevrolatU, Hope, Ann. Nat. 

 Hist. xii. 364, and Cat. pp. 20 and 6; this is evidently erroneous, 

 the type of D. ChevrolatU, which is now before me, proving to 

 be a var. max. o^ Dorcus Saiga, OHvier. There ought to be no 

 mistaking the two species, according to the description of the 

 mandibles of D. ChevrolatU, " 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 Eurytrachelus 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. 



Eurytrachelus Thomsoni ^ , Parry. 

 E. niger, tenuiter granulatus, subopacus, depressus ; capite 

 lato transverso, antice depresso, emarginato, tenuissime gra- 

 nuloso, pone oculos inflato ; mandibvdis 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 laevissimo, 

 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. Molucc. 



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 disc 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 

 tibiae appear also to be shorter, with the tarsi more slender ; the 



