1918.] F. H. Gravely : Passalidae of the World. 63 



come from Queensland. This specimen has hairy mesosternal scars and may belong to 

 a distinct species. 



Passulus punctatissimus differs from P. toriferus chiefly in having all the cephalic 

 tubercles longer and more acute, and in not having the eighth groove of the elytra hairy 

 in front. The frontal area may be partially or not at all punctured. The anterior ends 

 of the marginal grooves of the pronotum are not expanded but may be somewhat curved. 

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

 angles. 1 The outermost rib of the elytra is sometimes hairy throughout instead of only 

 in its anterior half. 2 The last two variations may perhaps indicate a tendency for the 

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



Passalus unicornis, Saint-Fargeau and Serville. 

 Passalus unicornis, Saint-Fargeau. and Serville, 1825, p. 20. 



Six specimens from Guadaloupe, 38-5-42-0 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, n. sp. 



Fig. VII, 22, p. 53. 



One specimen from Farinas, Bolivia, 39-5 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. opacus 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 (Linnaeus). 



Lucanus interruptus, Linnaeus, 1767, p. 560. 3 



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

 Mexico Guatemala (including one specimen from Escuintla), Honduras (San Pedro 

 Sula), Nicaragua, Panama (Chiriqui), Columbia, Venezuela (Caracas), Guiana (Demerara, 

 Surinam, Cayenne), Peruvian Amazon, Upper Amazon, Brazil (Amazonas, Pernambuco, 



1 This is most marked in the series from the Upper Amazon. 



2 This is so in the two specimens from the Peruvian Amazon. 



3 This is the reference usually given, but Linnaeus himself described the species at greater length in 1764 (p. 33) 

 and refers there to yet earlier descriptions. I have been unable to consult thes 3 and' cannot say in which or by 

 whom the name interruptus was first introduced. 



