ART. 5 GENERIC REVISION OF THE FOSSORIAL WASPS PARKER 163 



Length 13 mm. Described from a single female bearing the label, 

 "Natal, Brazil, W. M. Mann." 

 Type.—C2ii. No. 40853, U.S.N.M. 



MICROBEMBEX NASUTA. new species 



Figures 60, 61 



This species is described from two females and is distinguished 

 from all other species in the genus by the peculiar form of the 

 clypeus, as shown in Figures 60 and 61. It is unusually prominent 

 and bulging, the depth of its apical emargination for articulation 

 with the labrum being approximately equal to the greatest width of 

 this emargination. The species is further distinguished by the 

 fact that the posterior apical angle of the anterior metatarsus is 

 not produced into a promient lobe, a development found on all other 

 species of the genus. 



Type (female). — Black: mandibles, except tips; clypeus; labrum; 

 scape ; f rons between antennae ; spot on f rons below anterior ocellus ; 

 very broad anterior orbits, not reaching the vertex and dilated in- 

 ward at their dorsal extremity; very broad posterior orbits, almost 

 united across the vertex ; prothorax ; broad, lateral lines and pair of 

 broad, discal lines on scutum ; scutellum, except median longitudinal 

 black stripe; metanotum; very broad, curved fascia on propodeum; 

 lateral angle, posterior surface, and sides of propodeum ; metapleura ; 

 mesopleura and mesosternum; all tergites; sternites entirely, except 

 narrow, black anterior border on fifth and sixth : legs entirely ; pale^ 

 almost clay-colored yellow. On the anterior sternites the color is 

 a more decided yellow. 



The flagellum is dark above, almost black on some segments ; below 

 it is a light shade of ferruginous. The wings are hyaline and long, 

 reaching the end of the abdomen. The pubescence is white, and 

 although dense, is exceedingly short. The apex of the sixth tergite 

 is slightly and roundly emarginate. 



The paratype differs from the type in being a trifle larger and 

 in having the yellow on the tergites somewhat less extensive. The 

 fascia on the first tergite bears a median anterior emargination; 

 that on the second has a pair of shallow, rectangular anterior emar- 

 ginations; and tergites 3, 4, and 5 each shows an irregular, shallow 

 black border on anterior margin, variable in outline. Tergite 6 

 shows an anterior black border. The basal joints of the legs also 

 show dark markings, not being wholly yellow as on the type. 



Length 15-17 mm. The type bears the label, " Pie de Palo, San 

 Juan, 11 March, 1920, Argentine, Cornell U. Expedition." The 

 paratype bears the label, " Argentina, Mendoza, 22. 12. 1906, Jensen 

 Haarup V." 



