OF NATURAL HISTORY. G77 



with the posterior ui:ir;,'iii of the collar ami win^'-scale, white: 

 .sciitel white : wiiii^s hyaline; ucrvure.s black; carjtus white on 

 the basal half: abdoineii honey-yellow : feet honey-yellow : coxa) 

 white. 



Lenj^th seven-twentieths of an inch. 



The white terminal joints of the antennae strongly contrast 

 with the reniainini; joints. 



4. A. El'iCERA. — Black ; abdomen, ba.se of the antennae anil 

 feet honey-yellow. 



Inhabit.s Indiana. 



•J, Body somewhat slender, black ; antonn.t?, first and second 

 joints yellow, the latter two-thirds the length of the first; third 

 and fourth joints yellow on the upper side : na^us deeply eniar- 

 ginate, yellow-white : labrum suborbicular and with the mouth 

 whitish : mandibles piceous at tip : thorax, collar and wing-scale 

 yellow: wings hyaline; nervures black; carpal spot white on the 

 ba.sal half: abdomen honey -yellow, biu^al segment black: feet 

 honey -yellow : coxjc white. 



Length less than three-tenths of an inch. 



Var. o. Scutel dull yellowish. 



5. A. CESTUS. — Black ; a white baud at base of the tergum ; 

 pleura with a white spot. 



Inhabits United States. 



^Body black, with large crowded punctures: antenn:c, [217] 

 first and second joints yellow : nasus hardly emarginate with a 

 lateral whitish spot: thorax with the posterior margin of the 

 collar white : pleura with a white spot on the anterior upper 

 part: wings tinted with fuliginous; nervures black; carpal spot 

 wax-yellow : tergum with a dilated band extending to the lateral 

 sutures, white : feet white, a little varied with yellowi.sh at tijts 

 of the joints ; thighs black at base beneath. 



jAnal segment white : posterior coxaj at base black : posterior 

 thighs in the middle and their tibiae at tip black. 



Length seven-twentieths of an inch. 



Resembles the rjn'tiofus, but may be at once distingui.shcd by 

 the white spot of the pleura. 

 1885.] 



