68 U.S. NATIONAL MUSEUM BULLETIN 290 



confused, rather reduced; inner and outer rows at apex distinct, 

 usually uniting clearly, sometimes with a few confused punctures in 

 this region. 



Ventral surface: Ventral surface and legs nearly uniformly reddish. 

 With yellow as follows: on prosternum, mesosternum, mesepimeron, 

 front coxae, at side of each abdominal segment, and a ventral spot 

 before apex of each femur. Prosternum of male with anterior margin 

 produced into a broad, arcuate lobe, posterior margin behind each 

 coxa produced into a sharp, posteriorly directed spine. Pygidium 

 light orange with median stripe and sides reddish; coarsely punctate 

 with a more or less distinct, median, raised carina. Fifth abdominal 

 segment of male feebly depressed. 



Length: 4.0 to 4.4 mm. 



Type data. — This species is described from four males, all taken 

 in Arizona. The data are as follows (all types in USNM) : holotype 

 (type number 69241), "5 mi. s. Rock Springs, Arizona, VI-24-57 

 R. S. Beal"; paratypes, "Hot Springs, Arizona, 26.6 Barber and 

 Schwarz"; "Sabino Canyon, Arizona, June 19, 1918, 9:30 P.M., 

 F. C. Craighead, Prosopis juliflora flowers"; and "Sabino Canyon, 

 Arizona, August 6, 1959, K. V. Krombein." 



Discussion. — C. maccus is closely related to bivius and is easily 

 distinguished from it. In bivius, the large transverse common dark 

 marking of the elytra is before the middle; in maccus, it is behind the 

 middle. Also, the lateral spot on each side of the pronotum of bivius 

 is small and does not join the adjacent stripe; in maccus, the lateral 

 spot is moderate in size and usually joins the adjacent stripe. The 

 closest relative of maccus is pseudomaccus, new species ; for the difi"er- 

 ences see under the latter species. 



The name maccus is Latin for buffoon, and it was selected because 

 of the resemblance of the color pattern of the dorsal surface to the 

 face of a clown. 



I have seen an additional six members of this species from the 

 Burdette White collection. Three were taken at Toltec, Arizona, one 

 at Globe, Arizona, one at San Carlos, Arizona, and the last at Van 

 Horn, Texas. These are not paratypes. 



Cryptocephalus nteriis Fall 



Figures 9, 81 



Cryptocephalus merus Fall, 1932, p. 23. 



Pronotum: Dull creamy yellow to orange with dark markings and 

 large punctures reddish to brown; dark markings tending to form 

 four longitudinal vittae, these indistinct and poorly differentiated or 

 indicated only at base; usually with a small, pigmented, coarsely 



