Report upon Aculeate Uymenoptera. 277 



Plate of first alidoniiiKil segment two or more times longer than wide 

 at apex 2 



Plate of fir.st abdominal segment less than twice as long as wide at 

 apex. 



First, second and third segments, more or less, sculptured. 



Abdomen beneath, or at least the basal half, and legs brownish- 

 yellow, a spot at tip of hind femora, tip of hind tibia; and 

 their tarsi fuscous (1) A. (jrenadenaia, n. sp. 



First and second segments alone sculptured or punctate. 



First and second segments striate or rugulose ; abdomen above 

 black, beneath and along the lateral edges of dorsum brownish- 

 yellow ; legs yellowish, the hind coxse more or less, or basally, 

 a small spot at apex of hind femora, apex of the tibia3 and 

 their tarsi fuscous. . . . (2) A. marguiiventrls, Cresson. 



First and second segments sparsely punctate, the second almost 

 smooth. 

 Abdomen brownish-yellow, the disks of the dm'sal segments 

 more or less fuscous or wholly black, tlie plate of the first 

 segment always Ijlack or fuscous ; legs brownish-yellow, tips 

 of hind femora and tibia? and tlieir tarsi fuscous ; thorax 

 entirely black. . . . . (3) A. amerkanns^ Lepeletier. 

 Abdomen wholly brownish or honey-yellow ; legs as in A. 

 amerkanus, Lepel. ; tliorax not entirely black, the mesopleura 

 always yellowish. (A) A. Jlitviventris, Crei^son. 



2. First segment sparsely punctate, the second smooth, M'ith two 



oblique furrows at base, and longer than the third. 

 Head and metathorax black, rest of thorax, the abdomen and 

 the legs brownish-yellow, the apical third or more of hind 

 femora, their tibite, except a broad annulus at base, and hind 

 tarsi fuscous. ^ (5) -4. irkhscens, Cresson. 



3. All coxte yellow 



Hind coxa; alone black . 4 



All coxa; black. 

 Second abdominal segment shorter than the third, with two obli(jue 

 furrows. 



Abdomen smooth, mostly black, with ventral segments 1-3 and 

 the lateral margins of the same dorsal segments brownish- 

 yellow ; legs brownish-yellow ; tips of hind femora, tips of hind 

 tibia' and their tarsi fuscous ; palpi white. ^ . 



(6) ^1. herhcilii, n. sp. 



Abdomen with the plate of the first segment finely sculptured, 

 or at least alutaceous, black ; ventral segments 1 to 3 and legs 

 yellowish ; a spot at n\)ex of hind femora, tips of hind tibite 

 and their tarsi fuscous, 



