728 BOSTON JOURNAL 



Natural character. — Body moderately slender : head longitu- 

 dinally oblong, truncate or a little excavated before, over the in- 

 sertion of the antennae ; eyes lateral, rounded, entire : stemmata 

 three : antennae submoniliform, gradually enlarging a little to- 

 wards the tip ; basal joint longest and dilated : wings without 

 obvious nervures ; superior wings large, folded longitudinally in 

 two, and at the tip of the fold with a profound fissure ; inferior wings 

 rather slender : abdomen composed of but two segments, of which 

 the basal one is somewhat petioliform : feet moderate. [282] 



Observations. — This new genus differs from all others with 

 which I am acquainted, that have nerveless wings, by having 

 the superior wings doubled, by an equal fold, and at their tips a 

 deep and obvious fissure. I have, as yet, seen only the male. 



C. POLITA. — Black ; feet honey-yellow. 



Inhabits Indiana. 



Body polished, black : head anteriorly rugose and biangulated : 

 antennas at base, excepting the first joint, piceous : thorax with 

 two impre.s.sed lines : wings with short hairs and ciliate : abdo- 

 men oblong-oval, basal segment with elevated lines. 



Length about one-twelfth of an inch. 



Taken on the window, July 20. 



PSILUS Jur. 



1. P. TERMINATUS. — Black ; fect and base of the antennse 

 honey-yellow. 



Inhabits Indiana. 



Body black, polished, with a few, rather long, scattered hairs : 

 antennae thirteen-jointed, elongated, geniculate between the second 

 and third joints, honey-yellow; first joint in a frontal groove; 

 second joint elongated, subfusiform, third joint cyathiform ; re- 

 maining joints moniliform, equal to the eleventh joint, which is 

 abruptly dilated and with the twelfth equal, subquadrate, black; 

 thirteenth joint subequal to the preceding, globose-ovate, black : 

 wings with short ciliae, and with short hairs; [283] nervures 

 none ; stigma triangular, black ; abdomen dull honey-yellow at 

 base ; first segment half as long as the thorax : feet honey -yel- 

 low. 



Length over one-twentieth of an inch. 



[VoL I. 



