410 ACADEMY or NATURAL SCIENCES 



3. A. ANTENNATA. — A glaucous Occipital band ; two basal 

 joints of the antennje subequal. 



Inhabits Indiana. 



% Body obscure bluish-green, somewhat metallic ; head green 

 before ; mouth yellow ; vertex and occiput black, the latter with 

 a glaucous band, clavate each side; eyes dark greenish, above 

 blackish ; antennae with the two basal joints much thicker than the 

 others, equal in length, the first cylindrie, the second attenuated 

 at base ; thorax with a glaucous vitta each side of the back ; 

 wings hyaline ; cellules chiefly quadrangular ; stigma rhomboidal, 

 not longer than broad ; tergum with a glaucous band 'at base of 

 each segment ; the green color at tip extends upon the sides ; 

 venter glaucous, with a black line ; pleura glaucous ; pectus 

 paler; feet whitish, with a [40] broad black line on the thighs, 

 and another on the tibite, excepting the posterior ones. 



Length one inch and two-fifths. 



This species is smaller than apicalis, and larger than either 

 verticalis or hastata nob., and is distinguished from them by the 

 elongation of the basal cylindrie joint of the antennae being 

 equal in length to the second joint. 



4. A. APICALIS. — Two or three ultimate abdominal segments 

 pearlaceous blue above. 



Inhabits the United States. 



Head pale brown ; a black band on the vertex between the 

 eyes, and sometimes two black circles ; thorax pale brown, or 

 bluish pearly, with black sutures ; wings hyaline, with chiefly 

 quadrangular cellules ; carpus short, rhomboidal, brown, or dull 

 whitish ; nervures black ; abdomen black-green ; segments ex- 

 cepting the terminal three, with a dull whitish, basal annulus, 

 from which proceeds a slender line, and on the side, a broader 

 one of the same color, neither of which reach the tip of the seg- 

 ment ; three ultimate segments dull yellowish, or cerulean pearla- 

 ceous above and on each side ; pleura and pectus pale yellowish ; 

 feet pale yellow; thighs lineated with brown; tarsi with black 

 incisures and extremity. 



Length one inch and a half. 



A very common species, remarkable, when recent, by the color 



[Vol. VIII. 



