088 BOSTON JOURNAL 



10. I. DUPLICATUS. — Black; abdomen rufous; Dietathorax 

 with yellow marks. 



% Body black : hypostoma, palpi and orbits yellow : antennjv; 

 with a whitish annulus beyond the fifteenth joint : thorax with 

 the dorsal impressed lines not deep, and extending from the mid- 

 dle to the anterior margin ; a yellow line before the wings ; 

 wing-scale dull yellowish : scutel bright yellow, a little convex : 

 wings slightly tinted with fuliginous; stigma dull honey-yellow; 

 second cubital cellule four-angled ; the recurrent nervures with 

 slight processes : metathorax with a large yellow W behind, and 

 a yellow spot at tip of the scutel : tergum rufous ; second seg- 

 ment not distinctly excavated at base each side ; first segment 

 as long as the second, slender, black at base and tinged with yel- 

 low at tip : coxae having a yellow spot : thighs black, the two 

 anterior pairs varied with yellowish towards the tip : tibiae yel- 

 low ; anterior pairs having a black line behind : posterior pair 

 black at [231] tip aud at the extreme base : tarsi yellowish, ter- 

 minal joint black at tip. 



% Thorax with a quadrate yellow spot on the middle. 



Length over three-fifths of an inch. 



The form of the abdomen is that of an Alomya Panz., but the 

 wings are not remarkably short, nor are the antennae convoluted. 

 The markings of the metathorax are much like those of /. pec- 

 toralis nob. 



11. I. RESiDUUS nob. Contr. Macl. Lye. p. 73, resembles 

 auturalis nob., but is much smaller, with tricolored antennae. 



CRYPTUS Fabr. 



1. C. ORBUS. — Second cubital cellule incomplete ; thorax with 

 two dorsal yellow lines. 



Inhabits Indiana. 



Body black : orbits and hypostoma white : thorax with two 

 lines on the disk and collar white : scutel, transverse line beneath 

 it, and line each side at its base diverging towards the base of the 

 wings, white : wings hyaline ; nervures fuscous ; second cubital 

 cellule small, rounded, pentangular, the nervure of division from 

 the third cellule wanting : metathorax whitish with about three 

 black abbreviated lines : abdomen long, tapering to the base : 



[Vol. I. 



