no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 10 7 



lateral angles of median segment and sides of same emarginate above, 

 metapleurae, greater part of mesopleurae, broad fasciae on tergites 

 1-6, first with a more or less extensive medial anterior emargination 

 or inclosing a closely placed medial anterior pair of black spots, second 

 inclosing a pair of dorsal oval black spots that appear in the form of 

 emarginations on some specimens, third to sixth biemarginate on 

 anterior dorsal margin less evident on the more posterior ones, apex 

 of seventh, second sternite except median black line and rarely small 

 anterior lateral spots, third except triangular median anterior black 

 spot, fourth except wide but shallow anterior emargination, narrow 

 biemarginate fascia on fifth, broader fascia on sixth usually with a 

 small triangular median emargination, legs entirely except variable 

 black spots on coxae and trochanters, yellow. 



Segments 6-8 of the flagellum are very slightly spinose on the pos- 

 terior border. The middle femora are smooth and the middle tibiae 

 normal. The second sternite bears a more or less prominent median 

 longitudinal carina, and the sixth a pair of small closely approxi- 

 mated processes that diverge slightly toward the base of the segment. 

 When viewed from the side these processes appear as one. The 

 seventh ends in a spine that in some cases is slightly bifid at the 

 apex. The genital stipes, although maintaining the general design, 

 varies somewhat in development. 



Female. — Black: Labrum, mandibles except apices, clypeus, an- 

 terior orbits, median vertical line on frons, scape below, posterior 

 orbits sometimes prolonged above on occiput, prothorax except 

 median anterior dorsal spot, tegulae, lateral lines on scutum, pair of 

 longitudinal discal lines on scutum, sometimes wanting and sometimes 

 developed into more or less perfect U-shaped mark, fascia on scutel- 

 lum, fascia on metanotum, lateral angles of median segment and sides 

 of same emarginate above, metapleurae, mesopleurae almost entirely, 

 broad fascia on tergites 1-5, first with a broad shallow medial anterior 

 emargination or inclosing two small black spots, second inclosing a 

 pair of transverse oval black spots, third frequently similar to the 

 second or biemarginate on anterior margin, fourth and fifth bi- 

 emarginate on anterior border, apex of sixth, second steriiite except 

 medial black spot, third except medial anterior black spot, fasciae on 

 fourth and fifth rather narrow and usually biemarginate on anterior 

 border, apex of sixth, legs except a variable amount of black on coxae 

 and trochanters, yellow. 



Length. — 16-20 mm. 



This species is conspicuous for its extensive bright yellow markings. 

 In both male and female the eyes are distinctly divergent at the cly- 

 peus and in nearly all specimens are golden yellow in the dried speci- 

 mens. The flagellum is comparatively slender and is yellow below, 

 more so in the female than in the male. The second segment in both 



