UHYNCIIITIIKE — ISUTUEIN.E — IScmiEINl. 1 7 



remarkable form found at Oeningon, for which Heer lia.s proposed the name 

 Antliarliiims, on account of the rostrum "of a hair-like fineness." 



The occurrence of other Khynchophora, which iiuist phiinly Ijclon','' to 

 the Rhyndiitida', liut which share with Pterocolus some characteristics other- 

 wise peculiar to it, is distinct evidence that Le Oonte was correct in sepa- 

 ratinjT Pterocohis from the genera with which it had been formerly asso- 

 ciated and placing it in the Rhynchitida'. 



There appear to be two groups of genera belonging to this subfamily, 

 which provisionally may be regarded as tribes. They may be separated as 

 f(jllows : 



Table of the tribes of Isotheina: 



Largp species normally of an elongated form with straight dorsum, the heatl generally 

 of considerable length and the rostrnni always rigidly straiglit hotheiiii. 



Small species normally of a plump and compact form, with well rounded dorsum, the 

 head shorter. the rostrum either straight or gently eiuved Toxorhijnvltini. 



Tribe ISOTHEINI. 



The memliers of this tribe are peculiar for their considerable size, the 

 elongate, more or less parallel-sided form, there being scarcely any if any 

 diminution in breadth forward before the middle of the prothorax; some- 

 times, however, they are stout, but then do not have so arched a Itodv as 

 in the sue -einling tril)e: the head is usuallv of exceptional length, and th(! 

 rostnun always rigidly straight and pon-ect. ainl usuallv loui;- and slender. 



Tnbh of the genera of Tsothcini. 



Body elongate, fully .two and a half times longer than Inoador high; rostrum directed 

 nearly straight forward; Joints of club of anteume larger at ajicx than at 

 base. 

 Nintli and tenth antennal Joints only a little larger at apex than at ba.se. Third 



ventral segment of abdomen as long as the sccimil Paltorhi/iiclnis. 



Ninth and tenth anteunal Joints twice as broad at ai)ex as at base. Third veiilnd 



segment of abdomen short<>r than the second ... Isothea. 



Body stouter, but little more than twice as long as broad or high; rostrum more (u- le.ss 



declivent ; Jointsof antennalclnb not enlarged ai)ically Tri/panorln/nchiis. 



MON X.\I 2 



