1918.] 



I'\ If. (iKAVKi.v : Pdssalid'ie of the World. 



65 



Tliis species differs from the last only in the form of the frontal area, which is slightly 

 longer in proportion to its width and is more or less distinctly grooved in continuation of 

 the median notch on the anterior margin. 



The species of Pass(d>is known to me may be distinguished from one another thus : — 



/The punctures in the grooves of the elytra extremely coarse, 



transverse laterally ; the anterior margin of the head straight 



between the outer tuberrles ; the lateral areas of the nietas- 



ternuin hairless (small insects only) . . . . . . . . 2. 



K The punctures in the grooves of the elytra less coarse, not 

 I transverse laterally ; or, the anterior margin of the head 

 I strongly notched in the middle ; or, the lateral areas of the 

 \^ metasternuni hairy . . . . • • • • • • • ■ 3- 



hairless 

 •2<' 



3< 



( The epipleura hairles 



I The epipleura hairy 



/"The anterior margin of the head straight or simply notched 

 in the middle, without secondary tubercles ; the frontal 

 area large, with the central tubercle about half as far from 

 the anterior margin as the outer tubercles are from each 

 other, and with the frontal ridges usually straight and 

 diverging at about a right angle ; the central tubercle small, 

 without free apex ; the outer tubercles prominent, the inner 

 tubercles usually situated very near them, always nearer 

 to them than to the central tubercle ; the lateral areas of 

 the metastcrnum. and the epipleura and shoulders of the 

 elytra, hairless 

 Not as above 



/"The anterior margin of the head straight between the outer 

 tubercles ; the clypeus entirely hidden ; the central tubercle 

 smal' with no trace of free apex ; the inner tubercles usually 

 iiiucli less widely separated than the outer, and when 

 distinct alwavs situated a considerable distance behind them ; 

 the frontal ridges straight, not arched, meeting in a distinct 

 though sometimes more or less obtuse angle ; the epipleura 

 usuallv hairless, when hairy the lateral areas of the 

 metasternuni always hairy also 

 Not as above 



The inner and outer tubercles equally widely separated, the 

 fomer situated at a considerable distance behind the latter ; 

 the epipleura densely hairy 

 Not aa above 



The anterior margin «>f the head usually sninewhiit thickened : 

 the outer tubercles obsolete, obtuse ; the frontal ridges 

 ending in the inner tubercles, which are very pronounced 

 and are situated about half way between the central and 

 outer tubercles 

 Not as above 



P. tionits, p. ." 

 P. rugosu.s, p. 



P. punclato-striatui, p. -j'l 



P. rhiiihx'anthopo'des, p. 53 , 



P. morio, p. 51. 



