MACLURIAN LYCEUM. 379 



at tip ; small central cellule angulated at the superior basal angle 

 and with a very slight process, its terminal nervure almost oblit- 

 erated on the outer half, its outer nervure almost obliterated in 

 the middle and white in that part : the two terminal connecting 

 nervures forming an acute angle; pleura paler than the thorax; 

 abdomen, second segment hardly as long as the first and longer 

 than the third. 



Leng-th seven-twentieths of an inch. 



2. 0. ANALIS. — Reddish-brown : head above black, beneath 

 the antennae yellow ; abdomen black at tip. 



Inhabits Indiana. 



Head above the antennae black : beneath the antennae yellow : 

 occiput black, reddish-brown each side : antennae dark reddish- 

 brown, almost black, at base black : beneath somewhat paler, 

 darker towards the base, radical joint yellow at base; thorax red- 

 dish brown, with large blackish disk, divided into three wide 

 lines by two impressed lines ; sutures of the scutel and metatho- 

 rax black ; wings the larger central cellule obtuse at tip ; smaller 

 central cellule with a small angle at tip, where it is widest, very 

 obtusely rounded at the superior basal angle ; do not meet and 

 form an angle, carpal spot slender ; pectus black ; posterior thighs 

 blackish at base, their coxae with [76] a black spot, their tibiae 

 dusky at tip and their tarsi yellow; abdomen black at tip and 

 on the superior edge of the second segment, which is at least as 

 long as the first segment. 



Length 9 nearly three-fifths of an inch. 



3. 0. GEMINATUS. — Yellowish ; vertex with a black spot; 

 large central cellule of the wings obtuse at tip. 



Inhabits Indiana. 



Body dull yellowish ; head yellow ; vertex black : antennae 

 somewhat shorter than the body, tinged with brown, the first 

 joint yellow ; wings hyaline, with fuscous nervures and honey- 

 yellow somewhat dilated carpal spot : large central cellule obtuse 

 at tip, the nervure of the tip double ; smaller central cellule very 

 obtusely rounded at the superior basal angle ; pleura and pectus 

 pale yellowish; abdomen, second segment obviously shorter than 

 the first, and not longer than the third. 



Length about two-fifths of an inch. 



