WASP GENUS CERCERIS — SCULLEN 485 



58. Cerceris macsivaini, new species 



FiGUKEs 84, 164a,b,c 



Female. — ^Length 10 mm. Black with creamy-white markings; 

 punctation average; pubescence very short. 



Head slightly wider than the thorax; black except for large frontal 

 eye patches, the medial lobe of the clypeus, small patches on the 

 lateral clypeal lobes, large spot back of the eye, and the base of the 

 mandibles, all of which are creamy white; clypeal border with two 

 blunt lateral denticles and a divided medial one; clypeal process 

 broader than long and with the apex emarginate; mandibles with 

 two distinct denticles, the apical one slightly the larger; antennae 

 normal in form and largely ferruginous. 



Thorax black except for a divided band on the pronotum, the 

 metanotum, a large patch on the propodeum, a spot on the pleuron, 

 and a spot on the tegulae, all of which are creamy white; tegulae 

 low and smooth; enclosure heavily ridged longitudinally with the 

 apical ends of the ridges spreading; mesosternal tubercles very incon- 

 spicuous; legs largely dark fuscous except for creamy-white patches 

 near the apical ends of the first two pair of femora; wings subhyaline 

 with the usual clouded area near the apex. 



Abdomen with two lateral patches on tergum 1, terga 2 to 5 with 

 deeply emarginate bands, all of which are creamy white; venter 

 immaculate; pygidium with the sides subparallel basally but converg- 

 ing apically to a rounded end. 



Male. — Length 9 mm. Black with creamy-white markings; punc- 

 tation average; pubescence very short. 



Head slightly wider than the thorax; black except the entire face, 

 small spot back of the eye, base of the mandibles, and the scape, 

 all of which are creamy white; clypeal border with three subequal 

 but low denticles; hair lobes extend over about two-thirds of the 

 lateral clypeal lobe; mandibles with little more than a sinuate carina; 

 flagellum ferruginous below, becoming darker above. 



Thorax black except for a broken band on the pronotum, the 

 metanotum, a large patch on the propodeum, a small evanescent spot 

 on the pleuron, and the tegulae, all of which are creamy white; 

 tegulae low and smooth; enclosm"e variably ridged; mesosternal 

 tubercle absent; legs largely creamy white except for dark patches 

 near the basal end of the first two pair of femora, the apical one-third 

 of the third pair of femora, a patch on the apical end of the hind 

 pair of tibiae, and the apical segments of the hind pair of tarsi; wings 

 subhyaline with the usual apical clouded area. 



Abdomen black except for two lateral patches on tergum 1, broad 

 but deeply emarginate bands on terga 2 to 6; venter with lateral 



