COSSONUS. 



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b. Head with the (globose) basal portion much smoother than the 



anterior (inter- ocular) portion, and usually separated from it by a 

 faint transverse groove. [= Borophlceus, WolL] 

 c 4 . Rostrum short ; eyes more or less prominent. 



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c 5 . Rostrum grooved between the points of insertion of the antennse 



(sublinear in C. puncticollis, Boh.) « . * 





Species 5-7. 



d\ Rostrum without groove. 





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c 6 . Rostrum very broadly dilated anteriorly Species 8. 





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d Q . Rostrum moderately dilated anteriorly . . 



rf 4 . Rostrum nearly as long as the prothorax, the long anterior portion 



very little wider than the basal portion ; eyes not prominent . . 

 b 2 . Prothorax with a definite basal excavation, sometimes extending forwards 



to the apex or divided down the middle by a smooth carina, the base 



more or less deeply bisinuate (more feebly so in a few of the smaller 

 forms) . 



c 3 . Head with the (globose) basal and anterior (inter-ocular) portions 



continuous above, closely punctate. 

 e 4 . Rostrum with a lanciform excavation extending upwards to the 



frontal fovea, the apex strongly dilated; prothorax closely punc- 

 tate, carinate, the basal excavation deep f . . . 



/ 4 . Rostrum with a short groove, the apex strongly dilated; prothoracic 



depression long and shallow 



y*. Rostrum unimpressed, narrow at the base, broadly dilated at the 































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apex 



prothoracic excavation long and 



deep; elytra depressed, 



with the seriate punctures transverse and closely packed .... 



h*. Rostrum unimpressed, feebly widened anteriorly, flattened in $ ; 



prothoracic excavation deep, triangular; elytra with the seriate 



punctures very coarse and foveiform 



d*. Head (except in C marcidus) with the (globose) basal portion much 



smoother than the anterior (inter- ocular) portion, and usually sepa- 

 rated from it by a faint transverse groove. 

 i 4 . The disc of the prothorax without a large, well-defined, smoother 



or polished space on each side or across the middle. 

 e 5 . The basal excavation of the prothorax large and deep. 



e 6 . Rostrum deeply sulcate, short, strongly dilated anteriorly; 



prothorax and elytra coarsely punctate 



/ G . Rostrum not sulcate*", strongly dilated anteriorly 



g 6 . Rostrum not sulcate, very little widened anteriorly (sublinear 



JXA \y • ICIC Llo • .£ j • • • •••••••••••• » 



/ 5 . The basal excavation of the prothorax shallower; rostrum dilated 



anteriorly. 



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h 6 . Eyes very prominent ; elytra variable in colour 



i 6 . Eyes not so prominent. 



Species 9-14. 



Species 15. 



Species 16. 



Species 17. 



Species 18, 19 



Species 20. 



Species 21. 

 Species 22-27 



Species 28-31 



Species 32. 



a 7 . Elytra black, sometimes in great part rufescent, not vittate . Species 33-39 

 b 1 . Elytra sharply vittate Species 40. 



* Except in some specimens of C. micrasjpis. 



GG2 



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