472 PROCEEDINGS OF THE NATIONAL IirUSEUM vol. no 



(Alabama), Daucus carota (Massachusetts, New York, Ohio), dogbane 

 {=Apocynumsp.; New Hampshire), Erechtites hieracifolia (New Jersey), 

 Euphorbia marginata (Kansas), Euthamia graminifolia (New Jersey). 

 Helianthus divaricatus (North CaroHna) horsemint (Texas) , Hydrangea 

 arborescens (North Carohna), Leucanthemum sp. (North Carolina), 

 Melilotus alba (Iowa, Kansas, Massachusetts, Tennessee), Monarda 

 didyma (North Carolina), peach (Georgia), Polygonum cuspidatum 

 (Massachusetts), Polygonum pensylvanicum (Illinois), Rhus glabra 

 (Maryland), Sambucus canadensis (Ohio), Solidago (Connecticut, 

 Massashusetts, New York, North Carolina, Pennsylvania, Virginia), 

 Solidago canadensis (Illinois, New York), Solidago serotina (North 

 Dakota), Symphoricarpos racemosus (Ohio). 



53b. Cerceris clypeata dakotensis Banks, new status 



FiGUKEs 76, 157a,b,c 



Cerceris dakotensis Banks, 1915, p. 402, — Stevens, 1917, p. 422. — Scullen, 1951, 

 p. 1007. 



Female. — Length 11 to 12 mm. Black with light yeUow markings; 

 punctation and pubescence average. 



Head subequal in width to the thorax; black except for large frontal 

 eye patches, surface of the clypeal process, base of mandibles, round 

 spots back of the eyes, and the scape, all of which are yellow; clypeal 

 border with two broad and low denticles with a depression between 

 them; clypeal process with the sides converging to a near truncate 

 apical end, which is very slightly emarginate; mandibles with three 

 low denticles, the apical one being more isolated and somewhat 

 larger; antennae normal in form. 



Thorax black except for two elongate patches on the pronotum, the 

 metanotum, oval patches on the propodeum, and the tegulae, all of 

 which are yellow; tegulae low and smooth; enclosm"e heavily ridged 

 transversally; mesosternal tubercle absent; legs with the coxae and 

 trochanters fuliginous on all legs, the basal half of the femora of the 

 fore- and midlegs also fuliginous and the more apical parts of all legs 

 yellow; wings subhyaline but slightly clouded. 



Abdomen with lateral yellow patches on tergum 1, a broad band 

 very slightly emarginate on tergum 2, deeply emarginate bands on 

 terga 3, 4, and 5; venter immaculate except for lateral yellow patches 

 on sternite 3; pygidium with sides slightly convex and converging to a 

 rounded apical end. 



Male. — Indistinguishable from the males of C. clypeata clypeata 

 Dahlbom. 



The female of C, clypeata dakotensis Banks is very close to C. 

 clypeata clypeata Dahlbom, from which the former is separated by 

 the form of its clypeal process. 



