500 PROC. ENT. SOC. WASH., VOL. 72, NO. 4, DECEMBER, 1970 A NEW CRENULASPIDIOTUS FROM ARIZONA ( HOMOPTERA : DiASPlDIDAE ) ^ ^ John A. Davidson, Department of Entomology, University of Maryland, College Park, Maryland 20742 ABSTRACT — The adult female and male and female scale covers of Crenulas-pidiotus mini, n. sp., from Prosopis sp. in Arizona are described and illustrated. Borchsenius (1966) recognized 4 species of Crenuhspidiotus for the world. Two of these, C. portoricensis (Lindinger) and C. sinuata (Ferris), were transferred from the genus Melanaspis and occur in North America. The purpose of this paper is to describe a new species found recently in Arizona. Crenulaspidiotus mini Davidson, n. sp. (Figs. 1-4) HOLOTYPE FEMALE: Body slightly turbinate (fig. 2), 0.6 mm. long, derm membranous. First 3 prepygidial abdominal segments lobed, derm wrinkled mar-ginally. Pygidium (fig. 3) broad, dorsal sclerotization strongly developed in 7 selerotized areas as follows: median sclerotized area largest with a pair of lateral furrows flanking the anus, the median most furrow uniting with the furrow border-ing the 2nd, 3rd and 4th areas; 2nd sclerotized area smallest, arising between the bases of the 2nd and 3rd lobes; 3rd sclerotized area arising between lobes 3 and 4, bearing 3 small ducts mesally; 4th sclerotized area narrow, arising from the base of lobe 4, bearing 2 small ducts mesally. Four pairs of distinct pygidial lobes (fig. 4) present as follows: median lobes low, broad, rounded, with the longest paraphyses arising from their bases; 2nd lobes low, broad, slightly notched, with 3 basally fused paraphyses; 3rd lobes 2-notched, with 1 long paraphysis basaUy expanded laterally; 4th lobes 2-notched, with 1 short paraphysis basally expanded laterally; 5th lobes replaced by a wide, many-notched, slightly sclerotized prom-inence. One interlobular paraphysis between lobes 1 and 2, 2 between lobes 2 and 3, 2 between lobes 3 and 4, 4 anterior to lobe 4, each bearing 1 short spine-like plate apically and marginal macroducts located between their bases. Pygidial venter with a V-shaped sclerotized area below the anus; perivulvar pores lacking; perivulvar squamations present; 4-5 ventral microducts disposed in 2 rows. First 2 prepygidial segments with submarginal microducts; marginal microducts extend anteriorly to the level of the mouthparts; a cluster of microducts present lateral to the mouthparts; antennal seta slightly expanded beyond mid-length. HABIT: Occurring in great numbers exposed on the bark of twigs. Female scale cover (fig. 1) 0.7-1.0 mm. in diameter, black, circular to slightly elongate, ^ This work was supported in part by the U.S.D.A., Agricultural Research Service, Entomology Research Division, Grant No. 12-14-100-9185(33). -Scientific Article No. A1551, Contribution No. 4258 of the Maryland Agri-cultural Experiment Station, Department of Entomology.