174 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Lyroda Say. 



Say; Jour. Nat. Hist., I, p. ,370; 1836. 



Form rather slender, sparsely pubescent. Head distinctly wider than 

 thorax, long and evenly rounded; antennae medium, scape rather stout; 

 eyes not converging, their inner margins parallel; three round ocelli, 

 arranged in a lovif triangle; mandibles emarginate beneath and dentate 

 within. Thorax slender, due largely to the rather long, narrow pro- 

 notum which is medially produced posteriorly (subtuberculate) ; pro- 

 podeum rounded-truncate, with a more or less evident carina at its dorso- 

 lateral angles (this carina is present at least at the apex) ; marginal call 

 of fore wings truncate and distinctly appendiculate, second submarginal 

 cell not petiolate; legs rather long, spinose. Abdomen rather narrow, 

 fusiform, first abdominal segment slender, more gently rounded and weli 

 tapering. 



o . Fore tarsal comb not strong; pygldium well defined, rounded- 

 triangular, and covered with short pile. 



^ . Fore femora entire; pygidial area hardly defined, pubescent. 



Key to the Species of Lyeoda. 

 Form stout; color deep black, without silvery pile on abdomen; wings 



dark fuscous ; length, 14-15 mm triloba 5 



Form rather slender; not deep black; silvery pile on abdomen; wangs 



dusky only at tip; length g , 7-8 mm.; j , 11-13 mm subita 



Lyroda subita Say. 



(Fig. 96, pygidium, 5 .) 

 Lyroda subita Say; Joui-. Nat. Hist., I, p. 372; 1836. g . 

 Lyroda subita Fox; Proc. Acad. Nat. Sci. Phil., 533-4; 1893. j- 5 . 



A small series of both sexes; Douglas, Norton, Rooks, Trego and 

 Decatur counties; June-August. 



Lyroda triloba Say. 

 (Fig. 37, ocellar area.) 

 Lyroda triloba Say; Jour. Nat. Hist., I, p. 372, 1836. 5 . 

 Lyroda triloba Fox; Proc. Acad. Nat. Sci. Phil., 533-4, 1893. 5 . 

 2 o o ; Clark and Smith counties; August-September. 

 Seemingly a rare insect. I find no record of the ^ . 



Plenoculus Fox. 



Fox; Psyche, VI, 554; 1893. 



Head wider than thorax; eyes converging towards vertex; antennae 

 short, stout and subclavate; ocelli round, arranged in a subequilateral 

 triangle; mandibles strongly excised beneath, dentate within. Pronotum 

 below the level of the scutum; propodeum short; marginal cell truncate, 

 second submarginal cell petiolate, first and second submarginals each 

 receiving a recurrent nervure, submedian cell shorter than the median 

 cell on the externo-median nervure; legs stout and spinose. 



