148 



Nesoprosopis anthracina Smith but somewhat more slender and 

 a little less erect in its origin from the basal plate of the 

 sternite. The edeagns, however, has the stipes greatly elon- 

 gate and attenuate as described in the genus Nathylaeus. The 

 basal area of the propodeum is undefined with a fe^v transverse 

 Aveak and indefinite rugae. Type Hylaeus (NesyJaeus) neso- 

 prosopoides Bridwell. 



Hylaeus (Nesylaeus) nesoprosopoides n. sp. 



$ Black, spot on anterior basal margin of mandibles, spot on labrum, 

 clypeus except anterior and fine upper lateral margins, sides of face nar- 

 rowed at the antennal sockets and above fhem rounded off to the eye, 

 spot on the supraclypeal area, obsolescent spot on base of scape, line on 

 the collar narrowed inwardly and interrupted, tubercles, basal half of teg- 

 ui?e, anterior knees and tibiae outwardly, large spot on base of middle 

 tibiae, basal half of hind tibiae, basitarsi and second joints of tarsi yel- 

 low; calcaria pale; tarsi brownish beyond second joint; flagellum not per- 

 ceptibly paler beneath; wings hyaline, the nervures brownish. 



Cheeks, occiput and mesopleura with fine scattered, pale hairs, collar 

 feebly pubescent behind, mesonotum with fine, evenly placed, sparse yel- 

 lowish hairs, sides of propodeum and its posterior face with the surface 

 more or less concealed by fine rather close appressed plumose pubescence. 

 First and second tergite with interrupted white hair bands on the apical 

 margins. Second and following tergites with scattered decumbent fine, 

 dark hairs. 



Clypeus except at apex, supraclypeal area, and sides of face 

 longitudinally lineolate and sparsely punctured, front and vertex strongly 

 and very densely punctured with moderate subconfluent punctures, the 

 surface somewhat shining. Mesonotum similarly punctured, the punctures 

 a little more separated, the surface duller, microscopically tessellate ; mes- 

 opleura similar ; scutellum similar bu the punctures coarser, vmevenly 

 spaced and removed from each other by more than their own diameter, 

 mesonotum similar but the punctures very shallow ; area of propodeum 

 entirely indefinite, shining, with a few indefinite, irregular transverse ru- 

 gae,rounded evenly down to the posterior face which has a deep longitu- 

 dinal median sulcus, carinate laterally, some shallow oblique punctures 

 are visible above the pubescence, and surface pubescent below apparently 

 above the pubescence, and surface where it is pubescent is apparently 

 rather densely punctured. 



First tergite highly polished and shining, almost impunctate medially 

 laterally rather closely and strongly pvmctured, second tergite rather 

 evenly and strongly though finely punctured, the surface duller as are 

 the remaining tergites, second tergite contracted apically and basally, the 

 third apically, the sternites shining and sparsely shallowly punctured. 



