REVISION OF GENTJS EUCERCERIS CRESSON Q 



34. Approximate length 10 mm.; basal segments of abdomen only ferruginous 



(Arizona, New Mexico, western Texas, and central plateau of Mexico) 



tricolor Cockerell 



Length 15 mm.; entire body and legs fulvous with yellow markings (Baja 



California, Mexico) lapezensis, new species 



35. Black with yellow or creamy white markings, no brown or amber .... 36 

 With considerable brown or amber replacing the black background colora- 

 tion at least on the head 38 



36. Length approximately 15 mm.; enclosure finely ridged, immaculate (Rocky 



Mountains and western states) flaTocincta Cresson 



Length 10 mm. or less; enclosure with two light oval patches 37 



37. Markings yellow; double yellow bands on two or more terga; enclosure 



coarsely ridged (California, western Nevada, northern Baja California, 



Mexico) insignis Provancher 



Markings creamy white; single bands on aU terga; enclosure smooth or 

 nearly so; lateral clypeal denticles may be bidentate or tridentate be- 

 coming sinuate when badly worn (southwestern Oregon, southern Idaho, 

 southern Wyoming) barri, new species 



38. Almost entire body ferruginous to fulvous; light markings very limited or 



absent (desert areas of southern California, north central and southern 



Nevada, and northern Baja California, Mexico) . . ferruginosa Scullen 



Amber or brown markings more limited black vnth prominent yellow or 



creamy white markings 39 



39. Markings creamy white; considerably ferruginous on the thorax and basal 



two terga (western Nevada) elegans elegans Cresson 



Thorax and abdomen black and yellow only 40 



40. Yellow markings dull, not glossy; without yellow spots on enclosure (lower 



Sacramento area in California) ruficeps Scullen 



Yellow markings very glossy; often with oval yellow spots on enclosure 

 (Mono and Inyo counties, Calif.) , . . elegans monoensis, new subspecies 



1. Eucerceris angulata Rohwer 



Figures 1, 59 a, b, c, d, e, f, g, h, i, j 



Eucerceris angulata Rohwer, 1912, p. 326. — Scullen, 1939, pp. 17, 18, 56-58, 

 figs. 34, 35, 36, 48, 51, 75, 89, lOS, 122, 134b, 156; 1948, pp. 157, 158, 180; 

 1951, p. 1011. 



The female of E. angulata Rohwer was described by Rohwer in 

 1912. The male was described and the female redescribed by Scullen 

 (1939). 



In later years both males and females have been taken by several 

 collectors in numerous locations as listed below. 



Type. — The holotype female of Eucerceris angulata Rohwer is at 

 the American Museum of Natural History. The type female is from 

 Lower California, between San Jose del Cabo and Triunfo. Collected 

 by 'Albatross.' 



Distribution. — Southern Arizona, southern New Mexico in the 

 United States; Baja California and Sonora, Mexico. Specimens are 

 as follows: 



