OF NATL HAL HISTORY. 739 



Body black, mufh punctured, and with a sli-ht n-fli-cti.m of 

 silvery hairs, particularly on the head, (»n the anterior sepnierit 

 of the thorax and on the met^ithorax : thorax with four hlii^ht, 

 impressed lines, and numerous confluent punctures : nictathtirax 

 reticulate with punctures, and with a slight ^'roove from the base 

 nearly to the middle : wings dark purjili.sh-fulij^inous ; radial cl- 

 lulo rounded at tip, not truncate ; third cubiul cellule [296] 

 rounded hexauirular, with abbreviated nervurcs from the two 

 outer angles ; a white line passes through the cubital celluK-s, 

 and a white spot is in the outer discoidal cellule: abdomen rufous 

 or bright honey-yellow; first or petiole segment black: feet sil- 

 very hairy. 



Length from half an inch to nearly seven-tenths. 



The neuration of the wings is much like that of the M. ilnlim 

 F., even to the white line and small spot ; but the third cubital 

 cellule is still more regularly hexagonal and the radial cellule is 

 not truncate at tip like those of the itnlirn and mrlanura King, 

 and many other species. 



3. M. VIGILANS. — % ]ilack ; large abdominal segment, ex- 

 cepting its anterior and posterior margins, rufous. 



Inhabits I'ennsylvania. 



Body black ; with large, dense punctures : thorax with three, 

 somewhat elevated lines and a slight apjiearance of another each 

 side : wing-scale convex, lineate on the margin ; the outer and 

 liinder margins lincatcd with minute, elevated, parallel lines : 

 wings purplish-black ; radial cellule truncate at \.\\) ; first cubital 

 cellule bisected by a white line; second cubital gradually and reg- 

 ularly narrowed to the base, with an abbreviated white line at 

 tip ; third cubital hexagonal, not contracted, the two exterior 

 angles with abbreviated nervures ; exterior di.«icoidal cellule with 

 a white dot : metathorax discoidally punctured ; dor.sal groove 

 extending beyond the middle ; large basal segment of the abdomen 

 with large remote punctures, smaller and clo.ser on the sides, 

 bright rufous, its basal and terminal margins black. 



Length over three-fifths of an inch. 



Resembles M. italica F., but differs in greater depth of color 

 in the lineations of the wing-scale, greater length [297] of the 

 1S35.] 



