o80 MACLURIAN LYCEUM 



This species closely resembles 0. bilineatus nob., but is much 

 smaller, and the arrangement of the wing-nervures proves it to be 

 a different species. 



4. O. emarginalus [emarginatus]. — Black; antennae fus- 

 cous ; feet honey-yellow. 



Inhabits Indiana. 



Body black, sericeous with short hair ; head convex beneath 

 the antennae, at the base of which the head is much more prom- 

 inent than immediately above the antennae where the head is in- 

 dented ; antennae short, above dark fuscous, beneath paler, first 

 joint rather longer; palpi white: thorax immaculate; metathorax 

 with four longitudinal slightly raised lines ; wings hyaline with 

 fnscous nervures and carpal spot ; larger central cellule obtuse or 

 [77] rather truncated at tip, and emarginated by the curvature of 

 the radial cellule ; smaller cellule with a small angle at tip, where 

 it is widest, and gradually tapering to its opposite extremity with- 

 out any curvature : feet honey-yellow, short, anterior coxae with 

 a whitish reflection; abdomen short, almost sensible, not compres- 

 sed.* 



ALYSIA Late. 



1. A. ridibunda. — Rufous ; head, wings and tip of the ter- 

 gum, black. 



Inhabits Indiana. 



Body yellowish-rufous ; head black, a rufous spot each side of 

 the mouth ; antennae longer than the body ; wings blackish ; 

 central cellule large, longitudinal, acute before, nervure connect- 

 ing with the carpal spot placed obviously behind the middle of 

 the cellule ; feet black; tibiae and tarsi more or less tinged with 

 dull rufous; tergum depressed, near the tip a large black spot. 



Length £ nearly one-fifth of an inch. 



2. A. pallipes. — Black ; feet, abdomen at base, and antennae 

 at base, white. 



Inhabits Indiana. 



Body black, polished ; antennae fuscous, first and second joints 

 whitish ; mandibles piceous ; wings hyaline, central cellule in 

 length equal to double its greatest width ; feet white ; abdomen 

 white at base. 



Length one-twentieth of an inch. 



