or NATIRAL UI.STOUV. 729 



Althou-^'h the wiuj^s entitle this species to a place in Juriiie's 

 Fsilus, yet the antemux are entirely diflererit from tli„.se .if the 

 type R elcgam, resembling considerably those of his P. antmmi- 

 ties. 



2. P. ABDOMINALIS. — Antennae clavatu, as long as the body ; 

 black, abdomen whitish. 



Iuhabit.s Indiana. 



Body black : anteuuju broken at the second joint; first joint 

 one-fourth the whole len-^th, whitish : second joint obconic : 

 terminal joint ovate-fusiform, longer than the three preceding 

 joints together; wings very deeply ciliated: abdomen whitish, 

 particularly at base : tarsi whitish. 



Length about one-fourth of an inch. 



3. P. APICALIS. — Antennae at the tip of the head, which is a 

 little prominent. 



Inhabits Indiana. 



Body black, polished ; antennae as long as the body, fuscous, 

 with subquadrately moniliform joints; basal long joint honey- 

 yellow ; terminal joint not much longer than the preceding one; 

 inserted at the tip of the head ; beneath the antennae is a rather 

 broad prominence : costal nervure but little less than half the 

 length of the wing, triangular and black at its tip; feet honey- 

 yellow : petiole distinct. 



Length one twenty-fifth of an inch. 



It is probable that the present insect is related to the /'. mr- 

 nntics of Panzer, but I have not the means of comparing. [284] 



4. P. COLON. — Wings M'ith a dusky dot before the middle. 

 Inhabits Indiana. 



Body black, polished ; antenna} nearly as long as the Itody ; 

 terminal joint as long as the first and equal to the four preceding, 

 joints together: wings hyaline; an oval, dusky spot a little be- 

 yond the tip of the costal nervure and extending nearly across 

 the wing : costal nervure with its terminal half more dilated than 

 the basal portion and blackish ; tarsi and anterior pair of tibiae 

 honey-yellow. 



Length one twenty-fifth of an inch. 



Readily distinguished by the dusky wing-spot. 

 1835.] 



