OTIORHYNCHIDAE. 451 



rallifi' (loeply notched and allow the base of the mandible to be 

 exposed; in the other there, is no eniargination or a very feeble 

 one. Accompanying these latter characters we have the upper 

 portion of the beak more prolonged above the mandibles in the 

 former case, while in the latter the mandibles are always greatly 

 exposed above. A lateral view of the beak will therefore show 

 the tip to be obliquely truncate in those with the emarginate 

 gena;, and squarely truncate in the other case. 



The scar of the deciduous mandibular cusp is very distinct in 

 all the genera excei)ting Coleocerus, and is usually on the face 

 of the mandible, although in some genera at the summit of an 

 obtuse process. 



The tribes forming this division are shown in the following 

 table: — 



Mentum moderate, rarely small, never retracted ; sub-meiitum not notched 

 at middle ; thorax rarely (Pachnseus) with feeble ocular lobes ; eyes 

 round ; 

 Thorax fimbriate at the sides beliind the eyes ; striaj entire. 



Tanymecini. 

 Tliorax not fimbriate at the sides behind the eyes ; 

 Geiiie emarginate behind the mandibles ; 



Rostrum short, robust ; tenth .striai confluent with the nintli ; claws 

 free, except iu Aj)hrastus. Cypuini. 



Genje not or very feebly emarginate ; tenth strise free ; 



Rostrum at least moderately elongate, scrobes long ; claws free ; 

 head not prolonged beliind the eyes ; articular surfaces of hind 

 tibiae cavernous ; mentum large. Evotixi. 



Rostrum rather short, scrobes sliort ; head prolonged behind the 

 eyes ; claws connate ; articular surfaces of hind tibiaj open ; 

 mentum small. I'nYLLOBiisi. 



Mentum small, retracted; thorax with large ocular lobes; eyes trans- 

 versely oval. Promecopini. 



The partial obliteration of the marginal stria occurs in but one 

 tribe, in the others that stria is entire and nearly equally distant 

 from the preceding throughout. The mentum attains the mini- 

 mum in the last two groups. 



Tribe I.— TAlVYIflECINI. 



Rostrum moderate, subangulate, subparallel, more or less 

 emarginate at tip and at the sides. Scrobes moderately deep, 

 arcuate, passing beneath the <'ye.s. Antennjc moderate, scape 



