732 BOSTON JOURNAL 



Length over one-fifth of an inch. 

 Inhabits Indiana. Common. 



3. F. iMPARis. — 9 Body light honey-yellow, impunctured : 

 head small : eyes oval, black : mandibles, teeth black : wings very 

 slightly tinged with fuliginous ; no recurrent nervure ; terminal 

 line of the brachial cellule angulated, the anal half being ob- 

 lique ; anal nervure robust to its tip, arcuated from its origin, 

 scarcely undulated, not communicating with the axillary ner- 

 vure : scale emarginate at tip, often deeply and acutely : tergum, 

 disks of the incisures a little deeper colored. 



Length nearly three-tenths of an inch. 



% Very small in comparison with the female ; black ; mouth 

 piceous : feet dull honey -yellow ; thighs, excepting the knees, 

 black. 



Length less than three-twentieths of an inch. 



This species is common in Indiana. The great disparity in 

 color and magnitude between the male and female, would deceive, 

 as to their specific identity. 



They appeared in great numbers on the 2d of April ; the males 

 swarmed around small bushes, alighting on the branches and leaves. 

 The females were but few. 



B. First cubital cellule witli a recurrent nervure. 



4. F. SESSiLis. — Peduncle concealed by the abdomen. 

 Inhabits Indiana 



Body blackish : mouth dull honey-yellow : antennae rather 

 long : thorax with the three segments very distinctly marked : 

 peduncle composed of a simple, oblong body ; destitute of a scale, 

 unless it be depressed and united to the surface of the peduncle, 

 concealed by the first segment of the abdomen : abdomen pro- 

 jecting over the peduncle, and having a deep and well defined 

 groove beneath the first segment for its reception : feet, except- 

 ing [288] at base, dull honey -yellow : wings with the discoidal 

 cellule, small, quadrate ; first cubital cellule not broader than the 

 radial, and bounded by a right line ; nervure of the second 

 cubital cellule obsolete. 



Length 9 three-twentieths of an inch : nearer about one-tenth 

 of an inch. 



The projection of the superior part of the basal segment of 



[Vol. I. 



