NO. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 121 



As in the case of the male, the variation in the maculations is 

 great. The labrum is usually bordered with yellow but it may be 

 wholly yellow, or, in rare cases, it may be entirely black. Tliis is Hke- 

 wise true for the clypeus. The mandibles also may be entirely black. 

 In the case of some western specimens the scape is yellow below. 

 The scutum frequently bears a pair of prominent discal marks, but 

 the increase or decrease of yellow on the scutum or sides of thorax 

 does not appear to bear any definite relation to the increase or 

 decrease of yellow on other parts of the body. The markings on the 

 females from the eastern part of the United States are for the most 

 part pale-yellowish white, whereas those on the females from the 

 western part are more commonly bright yellow, but yellow forms are 

 found in the East and hght ones occur in the West. 



Although it is quite possible that, in the large number of speci- 

 mens before me, collected from such widely separated localities, there 

 may be included distinct varieties or even more than one species, 

 nevertheless I am not able at tliis time to find characters on wliich 

 I can make a satisfactory separation. 



HalitaL—FloTida, Georgia, North Carolina, Virginia, District of 

 Columbia, Maryland, New Jersey, Pennsylvania, New York, Massa- 

 chusetts, Connecticut, Oliio, Michigan, Wisconsin, lUinois, Iowa, 

 Kansas, Texas, New Mexico, Colorado, Montana, Nevada, Cahfornia, 

 and Washington. 



Number of specimens examined — ^Males, 197; females, 157. 



MICROBEMBEX AURATA, new species. 



Figs. 218, 221, 222. 

 iliaZ^.— Black: Mandibles except apices, labrum, clypeus, scape 

 except spot above, narrow shortened anterior orbits, narrow broken 

 posterior orbits, prothorax almost entirely, tegulae, broad lateral 

 lines on scutum, pair of large diamond-shaped discal marks on same, 

 pair of large lateral spots on scutellum, metanotum, broad curved 

 fascia on dorsum of median segment, lateral angles and sides of same, 

 small spot on metapleurae, mesopleurae almost entirely, tergites 

 except a very narrow black basal border and on first tergite a mid- 

 dorsal black spot, sternites except a more or less extensive black basal 

 border, and legs except anterior basal parts of femora, Iriglit yellow. 

 Segments 6-8 of the flagellum bear prominent pits on the posterior 

 surface, and the ultimate segment is trmicate apically and is dis- 

 tinctly curved. The wings are hyaline. The pubescence on the 

 frons and vertex is tolerably long and dense but is not conspicuously 

 silvery. On the thorax and abdomen the pubescence is short and 

 not conspicuous except on the sides and ventral surface of the ulti- 

 mate abdominal segment, where it is more evident. The process on 

 the second sternite is large, curved, obliquely directed backward and 



