THE COCCIDAE OF SOUTHWESTERN UNITED STATES 65 



Scale. Scale of the female flat, circular, whitish, with the exuviae 

 subcentral. Scale of the male not observed. 



Female. Length 1 mm. Of normal form; derm of cephalothorax 

 but little chitinized. 



Pygidium with the median lobes alone developed, the others entirely 

 obsolete, their position indicated only by the spines at their bases and 

 the position of the poriferous furrows (incisions). Median lobes quite 

 prominent, parallel, with a notch in the lateral margin near the tip. There 

 is a rather long spine arising from the outer basal angle and a similar 

 spine marks the position of the second and third pairs of lobes. Plates 

 entirely lacking. First poriferous furrow (incision) with but three to 

 four pores, its margins bounded by rather conspicuous thickenings of 

 about equal length. Second incision with a single pore and with smaller 

 thickenings. Dorsal pores rather numerous. Ducts arising from the 

 pores moderately long and slender. The arrangement of the pores is 

 indicated by the figure. Circumgenital pores in four or five groups. 

 Median group, when present, represented by but one or two pores ; lateral 

 groups with two to five pores, these disposed along a thickening. 



Notes: Of the species known to me this most closely resembles A. ehrhorni 

 Coleman, which occurs on certain conifers in California. The two are separable 

 only by the fact that in ehrhorni small plates are present in the inter-lobular spaces 

 and there are tubular ducts in the extreme lateral angles of the pygidium. 



Aspidiotus graminellus Ckll. ? 

 Fig. 37. 



1901. Aspidiotus graminelius Ckll., Ann. Mag. Nat. Hist., (7), 7:333. 

 1903. Targionia graminella (Ckll.) ; Fernald, Catalogue Coccidae, p. 297. 



Type host and locality. From grass, Las Vegas, N. Mex. 



Material examined. From a perennial grass, probably Hilaria cen- 

 chroides, on the Jornada del Muerto, fifty-one miles north of Las Cruces, 

 N. Mex. 



Scale. Scale of the female white, circular, quite convex, with a 

 rather thick ventral scale; exuviae covered with secretion, yellow when 

 rubbed. Scale of the male resembling that of the female in color and 

 texture, but elongate and with the exuvium at one end. 



Female. Body of ordinary appearance, the cephalothorax more or 

 less chitinized. Pygidium with two pairs of lobes. Median pair quite 

 large and prominent, straight, their margins nearly parallel, their tips 

 with several small teeth. Second pair very small and projecting but little 

 from the margin, but nearly as broad as the first pair ; inner margin 

 straight, outer margin sloping, crenulate. Between the first and second 



