ART. 12. MASKELL GENERA OF COCCIDAE MORRISON. 93 



all stages. No other species deserving inclusion here are known to 



the writers. 



Genus CHENTRASPIS Leonardi. 



Genotype. — Aspidiotus unilobis Maskell, 



Reference.— Fernald, Cat. Cocc. World, 1903, pp. 251, 280. 



This is another genus which was established with only a single in- 

 cluded species, so that only it can be the type. 



The Maskell collection contains a single slide of this species, labeled 

 " adult female, 1894," and a small amount of material under No. 419. 



Adult female. — Scale as described by Maskell and Leonardi; body 

 nearly circular, the posterior apex slightly protruding and pointed; 

 derm anterior to pygidium wholly membranous, the thoracic and ab- 

 dominal segmentation indistinct ; antennae tiny tubercles, each bear- 

 ing a long stout seta ; spiracles small, without pores ; margins of head, 

 thoracic and abdominal segments, both dorsally and ventrally with 

 little groups of two or more relatively long slender setae and, usually, 

 one or more tiny tubular ducts; posterior abdominal segments with 

 a longitudinal row of tiny setae and a row of large tubular ducts on 

 each half dorsally, ventrally at margin with a number of small 

 tubular ducts on each side, with more of these in submarginal areas 

 and with two more or less distinct longitudinal rows of tiny setae; 

 anterior portion of pygidium hyaline, central portion more or less 

 chitinized; median lobes only present, these fused to form one lobe, 

 with a faint median notch, and usually two lateral notches; second 

 and third lobes represented by tiny spine-like triangles; no lateral 

 teeth or crenulations, but the margin outside of the plates somewhat 

 irregular ; plates present, strongly branched, two outside the median 

 lobes, then the tiny second lobe, then three more plates, then the tiny 

 third lobe, and one to four more plates, the last two, in the latter 

 case, simple; with three or four very short incisions in the margin, 

 these with more or less thickened bottoms and edges ; marginal setae 

 relatively very large, as long or somewhat longer than the plates, 

 the median pair quite stout, but becoming gradually more slender 

 toward the outer margin of the pygidium, dorsally with one just 

 outside the base of the median lobes, one above the tiny second lobes, 

 one above the third lobes, one well beyond the last group of plates, 

 and one well beyond this ; ventrally with one opposite each of these 

 except the first; without marginal chitinous paraphyses; anal open- 

 ing oval, medium in size, placed fairly close to the apex of the 

 pygidium ; paragenitals wanting ; dorsal marginal pores two between 

 first and second dorsal spines; two, separated, between second and 

 third spines; two, well separated, between third and fourth spines; 

 two, widely separated, between fourth and fifth spines ; dorsal pores 

 all near margin, about six in num.ber; ventrally with a number of 



