736 BOSTON JOURNAL 



8piniform; first abdominal segment almost eraarginate at the su- 

 perior tip ; second segment short and wide ; first joint of the an- 

 tennae long ; head anteriorly with numerous, approximate, im- 

 pressed lines. 



Length one-fifth of an inch. 



Appeared on the wing, July 19th. 



3. M. oprosiTA. 



SBody black, minutely and densely granulated: anteunfe 

 dusky ; pale yellowish towards the tip ; first joint slightly longer 

 than the second and third together ; second joint obtusely ob- 

 conic : hypostoma convex : mandibles piceous : thorax with a 

 glabrous line extending to the middle : wings dusky : second cu- 

 bital cellule turbinate, petiolated from the angle of the discoidal 

 cellule, its longitudinal nervures equally curved ; nervure sepa- 

 rating the second and third cellules in a direct line with the ner- 

 vure from the stigma ; discoidal cellule quadrate ; metathorax, 

 spines short, acute : abdomen polished, not obviously granulated j 

 second node with an impressed line above, dividing the surface 

 into three slight lobes : venter and feet tinged with piceous. 



Length over three-twentieths of an inch. 



Neuter. Dull honey-yellow : head minutely lineated : antennae, 

 first joint long : stethidium rather largely granulated ; spines 

 prominent, acute, reaching nearly to the tip of the first node : 

 abdomen glabrous, polished ; second node without impressed 

 line. 



Length less than one-fifth of an inch. 



4. M. INFLECTA. — Black : wings dusky ; discoidal cellule ob- 

 long. [293] 



Inhabits Indiana. 



% Body a little hairy, lineated with impressed lines, which are 

 more distinct on the metathorax, black, slightly tinged with pi- 

 ceous : antennae with a piceous tinge j first joint not longer than 

 the three following ones together : wings dusky; discoidal nearly 

 as long again as broad ; second cubital sessile, the separating 

 nervure from the first cubital rather abruptly inflected towards 

 the base, and nearer the base almost obsolete, the other including 

 nervure rectilinear j separating nervures between the first cubital 



[Vol. I. 



