738 BOSTON JOURNAL 



the bait, for several days, during which time their apparent num- 

 bers scarcely diminished. 



7. M. MINUTA. — Pale yellowish ; destitute of spines on the 

 metathorax. 



Inhabits Indiana. 



Body whitish-yellow : head rather large : antennre, terminal 

 joint three times as large as the preceding one: eyes small, black, 

 and placed low down : peduncle rather long : abdomen oval : very 

 pale honey-yellow. 



Length (neuter) less than three-fifths of an inch. 



[Is it not the same as the molesta ? — Ed.]] 



This may possibly prove to be an Atta. I obtained only a 

 single specimen, which was found entangled in the nails and 

 tarsi of a specimen of Gorijtes phalerahis nob., in my cabinet. 

 It does not appear to have a spine on any part, but there are a 

 few scattered hairs. [ 295 ] 



MLTTILLA Linn. 



* Eijcs emarginate. 



1. M. CONTRACTA. — Black; above ferruginous; wings black- 

 ish. 



Inhabits Arkansaw and Missouri. 



Body entirely black beneath, inclusive of the feet : above fer- 

 ruginous-yellowish : head black below the line of the eyes : me- 

 tathorax, petiole, anterior and lateral declivities of the abdomen 

 black. % Anterior half of the first segment of the tergum black : 

 Avings blackish-fuliginous, somewhat paler in the middle ; second 

 cubital cellule wide beneath and contracted but not angulated at 

 the radial cellule ; third cubital cellule so much contracted at 

 base that its extreme nervure is opposite to and joins the recur- 

 rent nervure. 



Length about half an inch. 



The neuration of the wings somewhat resembles that of the 

 viaura F. and is nearly the same as that of the erythrina Klug, 

 of Mexico. I obtained several specimens from Missouri, and Mr. 

 Nuttall gave me one from Arkansaw. 



2. M. HEXAGONA. — % Black; abdomen honey-yellow. 

 Inhabits Indiana and Missouri. 



[Vol. I. 



