380 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



Solidago sp. (Colorado, Iowa, Kansas, Nebraska, Texas), Telesperma 

 gracile (Utah). 



16b. Cerceris finitima citrina, new subspecies 



Figure 18 



Female. — Length 6 to 7 mm. Color black with yellow markings 

 covering over fifty per cent of the body surface; deeply and closely 

 pitted ; clothed with short silvery hairs. 



Head about one-fifth wider than the thorax; black but with the 

 yellow marldngs covering most of the face, basal half of the mandibles, 

 scape, and large irregular patch extending from one gena through 

 vertex to the opposite gena ; clypeal border with two widely separated 

 denticles ; clypeal surface with a very low, broad ridge ending laterally 

 in two slightly extended subhyaline points appearing just above and 

 mesad of the two dark border denticles ; mandibles with two centrally 

 located but distinctly separated denticles, the more apical one much 

 the larger and pointing distally; antennae normal in form, the scape 

 yellow, peduncle amber and the flagellum light amber below but 

 darker above. 



Thorax black except for a broad band on the pronotum, two short 

 stripes on the scutum, the scutellum, the metanotum, large patches 

 on the propodeum, two large patches on each pleuron, two small 

 spots on the sternum, and the tegulae, all of which are yellow; tegulae 

 elevated and lightly pitted; enclosure black, transversely rugose; 

 mesostemal tubercle present, partly yellow; legs largely yellow except 

 for small dark patches on the basal areas of each leg ; wings subhyaline 

 except the stigma, which is amber. 



Abdomen with broad yellow bands on terga 1 to 5, those on terga 

 3 to 5 somewhat emarginate; pygidium oval, broader basally, apical 

 end rounded, basal end truncate; venter dark amber except for a 

 mesal and two lateral yellow patches on stemites 2 to 4. 



Male. — Length 6 to 7 mm. Color black with yellow marldngs; 

 deeply and closely pitted ; clothed with short silvery hairs. 



Head about one-third wider than the thorax; black except entire 

 face, elongate patches on the genae, the vertex, basal two-thirds of 

 the mandibles, and the scape, all of which are yellow; border of clypeus 

 sinuate with two lateral and one medial slight extensions; clypeal 

 surface convex; mandibles smooth; antennae normal in form, scape 

 yellow, peduncle amber, flagellum light amber below, darker above. 



Thorax black except for two elongate patches on the pronotum, 

 the scutellum, the metanotum, large triangular patches on the pro- 

 podeum, two patches on the pleuron, and the tegulae, all of which 

 are yellow; mesostemal tubercle absent; tegulae elevated and lightly 



