no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 49 



ST1CTIELLA MEGACERA, new species. 



Figs. 71, 72, 91. 



Male. — Black: Labrum, mandibles except apices, clypeus, scape 

 except narrow line above, first two flagellar segments below, lower part 

 of frons, V-shaped spot below anterior ocellus, broad anterior orbits, 

 posterior orbits, narrow posterior dorsal border and sides of prothorax 

 except narrow line in front of tubercles, tegulae, short lateral lines 

 above base of wings on scutum, large lateral spots on scutellum, 

 short fascia on metanotum, lateral angles and sides of median seg- 

 ment, metapleurae, broad irregular line on mesopleurae and meso- 

 sternum meeting on the middle of the latter and prolonged back- 

 ward to the middle coxae, fasciae on tergites, first broad laterally 

 but widely and deeply emarginate on anterior middle, biemarginate 

 on posterior border and almost interrupted on midline, second 

 broad with a narrower anterior median emargination, of which the 

 posterior lateral angles are strongly produced obliquely laterally, 

 third with broad, shallow, anterior, median emargination, the remain- 

 der with slightly undulate anterior borders, apex of ultimate tergite, 

 first sternite, second except irregular anterior border, remaining 

 sternites with broad fasciae (which, when the abdomen is strongly 

 flexed, cause the sternites to appear entirely yellow), coxae, tro- 

 chanters except spot above, tibiae, and tarsi, yellow. 



The flagellum is dark above, reddish below. The second seg- 

 ment widens apically and the third is still broader; from the fourth 

 to the apex the width decreases imperceptibly. The ultimate seg- 

 ment is slightly curved and somewhat flattened apically. The legs 

 are relatively short and unusually stout. The middle femora are 

 decidedly short, thick and heavy and are smooth below; the middle 

 metatarsi are also unusually short, thick, and heavy and show no 

 trace of curve or spines on inner surface. The posterior are like- 

 wise unusually thick, heavy, and rounded and when seen from in 

 front are plainly arcuate, the hollow of the bow being on the upper 

 side. The pulvilli are large and distinct. The wings are hyaline 

 and a trifle over twice as long as the combined length of the thorax 

 and median segment. The pubescence is white, moderately long, 

 and dense on head, thorax, and base of abdomen; it is somewhat 

 shorter and less dense yet quite evident on all sternites and very 

 short and sparse on tergites. The second sternite bears a very 

 large median spine, very heavy at the base, bluntly pointed and 

 hirsute. The terminal spines of the eighth are very short and a 

 discal spine is lacking. 



Female. — Black: Labrum, mandibles except tips, clypeus, scape 

 below, greater part of flagellum below, lower part of frons, V-shaped 

 spot below anterior ocellus, broad anterior orbits, posterior orbits 

 65008°— Proc.N.M.vol.52— 17 4 



