OF NATURAL HISTORY. 715 



diseoidal cellule on the costal margin much smaller and distinct 

 from the stigma : abdomen elongate, subclavate, being slender at 

 base ; feet pale honey-yellow. 



Length about one-tenth of an inch. 



The much elongated stigma and the small spot which precedes 

 it, being larger and more separate than usual, readily distinguish 

 this species. 



8. M. CALLIPTERA. — Wings yellowish at base, bifasciate with 

 blackish. 



Inhabits Indiana. 



Stethidium black : feet honey-yellow : wings, at base and stigma 

 yellowish; a blackish band upon the two [265] diseoidal cel- 

 lules; and another blackish band across the stigma, along the 

 descending nervure to the small second cubital and continued 

 dilating to the anal margin, where it is almost confluent with the 

 other band ; terminal third hyaline ; inferior wings blackish, yel- 

 lowish on the basal third, this color extending along the costal 

 margin. 



This is larger than either of the preceding species. 



CHELONUS Jur. 



1. C. PARVUS. — Black ; base of the antennas, and anterior 

 thighs yellowish. 



Inhabits Indiana. 



Body densely punctured ; antennae, first joint beneath honey- 

 yellow : palpi whitish ; thorax with dilated punctures, particu- 

 larly on the disk and anteriorly : scutel and metathorax with di- 

 lated punctures ; the latter truncate behind : wings hyaline : 

 nervures blackish, pale at base : stigma large : second cubital 

 cellule small, subtriangular : abdomen without apparent sutures, 

 densely punctured ; the punctures longitudinally confluent into 

 wrinkles, which are more prominent at base ; venter profoundly 

 concave, excavated ; coxc black ; trochanters whitish ; thighs, 

 anterior pair honey-yellow ; the other pairs blackish ; tibia whit- 

 ish, posterior pairs blackish at tip ; tarsi whitish. 



Length over one-tenth of an inch. 



The^neuration of the wings corresponds with the dcnfatus F., 

 but the abdomen exhibits no more appearance of divisions than 

 1835.] 



