I'HS.l F II. (;kavki.y: Passnlidue of (hr WOrkl. 63 



«'oni(' Iniin (idicciisljiid. 'I'liis sjH'cimon has hairy mesosternal scars and mav liclong to 

 a distinct sjictics. 



Passidiis punrtdtisaiitiii.s dilTers fmiu /'. lorijenis cliieHy in liaving all the cephalic 

 tubercles longer and more acute, and in not having the eighth groove of the elytra hair}' 

 in front. The frontal area may bo ])artially or not at all punctured. The anterior ends 

 of the marginal grooves of the })ronotum aro not expanded but may be somewhat curved. 

 The pronotum is sometimes wider in front than behind, with acutely produced anterior 

 angles.* The outermost rib of the elytra is .sometimes hairy throughout in.stead of <mly 

 in its anterior half.- The last two variations may perhaps indicate a tendency for the 

 species to split u]) into various local races, but more material is needed to .settle this. 



Passalus unicornis, Saint- Fargeau and Serville. 



P(i.sx(iliis iiiiironiis. S,mit-F;Lr;;uau and Seivilli', 182.J. p. 20. 

 Six .specimens from (iuadaloupe, 38-5-420 mm. long. 



The central tubercle is extremely long and slender, much more so than in the preceding 

 species, but the other cephalic tubercles are much less prominent and more obtuse than 

 in that species. The pronotum is unpunctured, except in the uniformly narrow marginal 

 grooves, and in and close to the scars. The epipleura, shoulders, tips, and eighth and tenth 

 (usually also the ninth to a less extent) ribs of the elytra are covered with hair-bearing 

 punctures. 



Passalus opacus, u. sp. 



Fiji. VH. Jl'. p. .-)3. 



One specimen from Farinas, Bolivia, 395 mm. long. 



The whole surface of this insect is dull as in P. languidus (Kuwert, 1898, p. 275). from 

 which it differs in having all the grooves of the elytra much more strongly punctured. 

 Apart from its dulled surface P. opricus differs from P. unicornis in having the head more 

 rugose with a much shorter central tubercle, the sides of the pronotum more extensively 

 punctured, the marginal grooves of the pronotum very broad in front of the scars, the 

 mesosternal scars indistinct, no hair on the ribs of the elytra above or behind the extreme 

 anterior part of the tenth, and all the grooves of the elytra much more coarsely punctured, 

 the punctures in the lateral grooves being transverse. 



Passalus interruptus (l-innaeus). 



Lxianiis inli'iin/tliis. Ijiiiiacus. I7ii7. )). .")i)n.' 



One or more (often numerous) .specimens from each of the following localities : — Te.vas, 



Mexico (iuatemala (including one .specimen from E.scuintla). Honduras (San Pedro 



Sola), Nicaragua, Panama (Chiriqui), Columbia, Venezuela (Caracas). (Juiana (Demerara, 



Surinam, Cayenne), Peruvian Amazon. Upper Amazon, Brazil (.Vmazonas, Pernambuco 



• This 18 most niarkp<l in the serio.s from tlu- I'lipcr .Amnzon. 



» This is so in the two specimens from the Peruviiin .Aninzon. 



» This is the reference iisimlly given, but Linnneus himself described the speeies at greater length in 1764 (p. 33) 

 and refers there to yet cnrHer descriptions. I hnvo been unable to consult thes- and' cannot say in which or by 

 whom the name iitlrrriiplux was first intrmluced. 



