316 AMERICAN HYMENOPTERA. 



ally with no indication of a fourth tooth (fig. 42). Malar space con- 

 siderably shorter than its width at apex ; about one-sixth as long as 

 the eye. Clypeus rather coarsely punctate. Flagellum of antenna 

 about twice as long as the scape ; third antennal segment longer than 

 the fifth, the fifth somewhat longer than the fourth. 



Thorax. — Anterior part of dorsum covered with yellow pile ; a very 

 broad black band between the bases of the wings, its posterior border 

 extended backward, in a sharp median V, across, or nearly across, the 

 scutellum, the remainder of the scutellum being covered with yellow 

 pile ; mesopleura covered with lemon-yellow pile to, or nearly to, the 

 bases of the legs ; metapleura with mostly j'ellow pile ; sides of median 

 segment often with only yellow pile, but usually with a more or less 

 strong admixture of black hairs ; center of disc naked, smooth and 

 shining. 



Abdomen. — Dorsum : segment one yellow on the sides, the very middle 

 only scantily clothed with short, usually black, but sometimes ferru- 

 ginous, hairs ; segments two and three entirely ferruginous-red ; seg- 

 ment four entirely yellow ; segments five and six black. Venter mostly 

 black, but with the fringes on the apical margins of some of the mid- 

 dle segments usually more or less yellow, especially on the sides. 

 Hypopygium with no distinct median carina. 



Wings. — Moderately stained with brown ; the fore pair lightest 

 across the middle portion and darkest in the region beyond the veins. 



Legs .—^\iQ middle and hind trochanters and the bases of the middle 

 and hind femora on their lower sides bearing a considerable amount 

 of yellow pile ; the legs, aside from this, dark, except the bases of the 

 front femora sometimes with some yellow hair on their lower sides ; 

 corbicular fringes dark. 



Worker. — Much like the queen, but the face and the occiput usually 

 with less yellow pile, often entirely dark. The black band on the dor- 

 sum of the thorax often extending far forward, so as to leave only a 

 narrow line of yellow across the anterior part. Wings usually some- 

 what lighter than those of the queen. Bases of middle and hind 

 femora and the hind trochanters often entirely dark. 



Male. Head. — Very broad. Face and occiput largely covered with 

 yellow pile ; ventro-lateral portions of head bearing a large amount 

 of yellow pile, this often connecting with the yellow on the occi- 

 put. Malar space longer than its width at apex ; about one-fifth as 

 long as the eye. Clypeus mostly covered up with yellow pile. Flagel- 

 lum of antenna, when viewed laterally, appearing strongly crenate on 

 its lower side (fig. 23); about two and three-fourths times as long as 

 the scape ; third antennal segment slightly longer than the fourth, the 

 fifth longer than the third. 



Thorax. — Coloration much like that of the female, but with the inter- 

 alar band narrower and less sharply outlined ; mesopleura always 

 yellow to the bases of the legs ; metapleura and sides of median seg- 



