78 HYMENOPTERA ACULEATA. 



basal joint of tlie antennoB is very thick, and the nerve 

 which separates the first and second submarginal cells is 

 angulated and spurred on its inner margin ; the propodeum 

 is elongate, and reticulated or finely rugose ; abdomen short 

 and wide, somewhat cordiform, $ with penicilli on the 

 eighth dorsal valve, ? with the sixth dorsal valve short 

 and triangular ; tibiae with two calcaria. The species of 

 this genus are most active, and will generally, when dis- 

 turbed, make a quick, circuitous flight, and return almost 

 to the identical spot from which they rose. 



F. Smith and Shuckard both record the ordinary prey 

 of A. hoops for the sustenance of its larvas to be the larva 

 of a species of Pcntatoma, but Smith has also observed it 

 carrying home specimens of OxyheluH. Shuckard, on 

 Smith's authority, says Epeolus, but this mistake Smith 

 corrects in his Fossorial Hymenoptera, p. 96, pointing out 

 that the species was certainly Oxijhelus uniglumis. A. 

 stigma is so I'are that nothing is kuown of its habits. 



(2) 1. Larger; metanotum clathrately rugose . . Boors. 

 (1) 2. Smaller; metanotum finely reticulated . . stigma. 



A. hoops, Schr. — Head and thorax black ; eyes in the 

 male enormous, occupying the whole sides and vertex, 

 face in both sexes clothed with silvery hairs, vertex iu 

 the ? shining and remotely punctured, in both sexes with 

 long whitish pubescence posteriorly, and with the central 

 ocellus larger than the others, second joint of labial palpi 

 dilated triangularly, antennse with the basal joint very 

 large and thick, flagellum gradually narrowing to the 

 apical joint, which is finely pointed ; mesonotum finely 

 punctured (J, very shining and remotely punctured ?, 

 scutellum very shining in both sexes, propodeum elongate, 

 reticulated somewhat in longitudinal lines, rather densely 

 clothed at the sides, especially in the ^, with fine white 

 hairs, wings smoky near the apex, especially near the 

 costal margin, abdomen exceedingly finely rugulose, with 



