392 ACADEMY OP NATURAL SCIENCES 



cal, with two small distant teeth on the inner inferior side ; be- 

 yond the middle rectilinear, flattened, sides parallel, rounded at 

 tip ; inferior process about half as long as the superior pair, 

 wide, widely emarginate down to its middle. 



Length over two inches. 



This may readily be distinguished by the widely forked form 

 of the inferior caudal process. I have seen but the individual 

 sent me for examination by Dr. Harris. 



[Subsequently described as Gynacantha quadrijida Rambur, 

 Neuropt. 209. — Uhler.] 



8. M. OBLIQUA. — Thorax brown, with two oblique yellow 

 vittae before ; front yellow, with a black band. 



Inhabits Indiana. 



Eyes angularly contiguous above; front greenish-yellow, with 

 a black band ; antennas black ; space between the antennae and 

 region of the stemmata black ; occiput dull yellowish ; occipital 

 interval tuberculiform, greenish-yellow ; posterior upper canthus 

 of the eyes black, passing in a hairy ridge to the top of 

 the occipital tubercle ; stethidium fuscous ; two yellow oblique 

 vittsB before ; middle between the wings with a yellowish spot ', 

 pleura with two distant, parallel, oblique, yellow vittae, margined 

 with black ; wings hyaline, immaculate ; stigma black ; anal 

 membrane white ; abdomen blackish, a dorsal series of yellowish 

 spear-shaped marks, those of the two posterior segments dilated, 

 the last one quadrate : anal appendices not longer than the [16] 

 anal segment, mucronate; inferior process as broad at its tip as 

 the tip of the abdomen, and widely more or less emarginated : 

 beneath, first and second abdominal segments pale, the lateral 

 tubercle rounded, unarmed ; feet black. 



Length about two and a half inches. 



Var. a. Dorsal series of the abdomen none ; a lateral series of 

 dull yellowish, oblong, subtriangular spots. 



This variety was sent to me by Dr. Harris. I have not seen 

 the female. 



[Subsequently described as Cordulegaster fasciatus Rambur, 

 Xeuropt. 178. — Uhler.] 



j" I Eyes distant above. 



9, JE, FRATERNA. — Wings immaculate } thorax yellowish, with 



[Vol. VIIL 



