38 



OTIORHYNCHID^. 



'Horn. 



DICHOXENUS. 



ANAMETIS. 



The following table is the result of a study in which it has been my en- 

 deavor to develop a serial arrangement exhibiting, 



First, a gradual transition in the form of the rostrum, from the more ro- 

 bust to the elongate. 



Second, the tendency of the scrobes to change from the strongly arcuate 

 to the nearly straight and shallow form. 



Third, the structure of the abdomen, with the three segments nearly 

 equal (as in Ophryastes), to those with the abdomen of normal structure. 

 First suture of abdomen straight ; second segment 

 rarely as long as, never longer than the two 

 following united ; hind tibiae usually mutic. 

 Scrobes deep, well defined, at least moderately 



arcuate, passing inferiorly. 

 Scrobes strongly arcuate, passing beneath at a 



distance from the eyes 



Scrobes moderately arcuate, passing imme- 

 diately beneath the eye 



Scrobes evanescent posteriorly, badly defined, 

 nearly straight, directed toward the lower 

 angle of the eye. 

 Metasternal side pieces rather wide, suture 



distinct. 

 Hind tibiae distinctly mucronate ; corbels 



cavernous 



Hind tibiae not mucronate ; corbels open. . . 

 Metasternal side pieces indistinct, suture ob- 

 literated. 



Hind tibiae not mucronate ; corbels open. . 

 First suture of abdomen arcuate ; second segment 

 as long as, and frequently longer than the two 

 following united. 



Seventh joint of funicle distant from the club ; 

 third joint of tarsi broader than the second, 

 tarsi densely pubescent beneath. 

 Hind tibiae not mucronate. 

 Scrobes strongly arcuate, moderately deep ; 

 passing rapidly beneath at a distance 

 from the eyes. 

 Support of deciduous piece of mandible 



not prominent. 



Anterior tibiae denticulate within ; sur- 

 face of body scaly without hairs ; cor- 

 bels of hind tibiae open 



Anterior tibiae not denticulate ; surface 

 scaly and hairy; corbels sub-cavern- 

 ous. . MIMETES. 



MELAMOMPHUS. 

 DYSLOBUS. 



PANSCOPUS. 



ORIMODEMA. 



