WILLIAMS: LARRID^ OF KANSAS. 139 



Key to the Genera of Kansas Larrid>e. 



1. Three perfect ocelli 2 



The two posterior ocelli more or less distorted 7 



2. Second submarginal cell petiolate; mandibles entire or excised be- 



neath ; small forms 3 



Second submarginal cell not petiolate; mandibles excised beneath; 

 larger forms Lyroda 



3. Only two submarginal cells; marginal cell not appendiculate, acute 



at apex 4 



Three submarginal cells 5 



4. Two recurrent nervures Miscophus 



Three recurrent nervures Miscophinus 



5. Mandibles strongly excised beneath; pygidial area of ^ well de- 



defined, broad and shining; clypeus of j- with a fringe of hair 



on either side Plenocidns 



Mandibles not or very feebly excised beneath ; pygidium of j 

 hardly or not shining 6 



6. Hind femora thickest apically; pygidial area well defined, pilose 



in both sexes; marginal cell lanceolate, not appendiculate. 



Bothynostethus 

 Hind femora normal, more or less fusiform; pygidial area poorly 

 defined or lacking; marginal cell usually truncate and appen- 

 diculate at apex Niteliopsis 



7. A transverse swelling or ridge before the superior ocellus, thereby 



forming an angle with the upper portion of the head and the 

 front; posterior ocelli quite small, sometimes indistinct, proxi- 

 mate and transversely arranged or nearly so; a long facial de- 

 pression on each side of the frons for the reception of each 

 antenna; fore femora of j not emarginate beneath near the 



base i^ 



A more or less dome-shaped circular swelling behind the anterior 

 ocellus (no transverse swelling before it) ; posterior ocelli larger, 

 oblique to nearly longitudinal in position; forehead rounded; 

 fore femora of j emarginate near the base, except in some 

 Tachytes 9 



8. Mandibles distinctly dentate within; pronotum hardly depressed 



beneath the level of the mesonotum; posterior margin of the 

 pronotum nearly straight (transversely) ; pygidium of g prac- 

 tically bare , Larra 



Mandibles more or less distinctly bidentate within; pronotum some- 

 what depressed beneath the level of the mesonotum; posterior 

 margin of pronotum angled mesad into the mesonotum; pygid- 

 ium pubescent in both sexes Notogonia 



