ART. 12. MASKELL GENERA OF COCCIDAE MORRISON. 95 



submai'ginal micropores, two between two ventral spines, 3-5 between 

 the second and third ventral spines, and about four or five between 

 the third and fourth ventral spines; without setae dorsally; with a 

 submarginal row of four small ventral setae and with about five more 

 on each half of the anterior median portion of the pygidium ; with 

 three transverse linear basal thickenings, one median, and with one 

 long, somewhat indistinct thickening running from the median plates 

 out and back past these transverse thickenings. 



Inteiinediate stage female. — Body differing from that of adult 

 only in the smaller size and in the reduced numerical development 

 of the pores and setae. 



Larva. — Broad oval, somewhat more pointed behind; antennae 

 slender, 5-segmented, terminal annulate; legs slender, normal, spi- 

 racles small, slender, without pores, pygidium more or less developed, 

 margin with a median quadrate protuberance bearing two tiny setae, 

 outside this with an incision with a tubular duct, then with the 

 median lobe, the outer margin curved and crenulate, then a seta, fol- 

 lowed by an incision with pore, and beyond this a succession of setae 

 and pores ; ventrally below the first incision with the long apical seta 

 about a third the body length ; anal opening medium, oval, near apex 

 of abdomen. 



Cot7jpe.—C2.t. No. 24775, U.S.N.M. 



Besides the type, one other species, Aspidiotus extensus Maskell, 

 was subsequently included in the genus by Leonardi. This species 

 certainly can not be looked upon as being congeneric with the type. 

 The generic diagnosis which follows has been based on the type 

 species only. 



GENERIC DIAGNOSIS OF CHENTRASPIS. 



Diaspine forms, probably more closely related to the group con- 

 taining Aspidiotus camelliae Signoret {rapax Comstock) than to 

 any other; adult female with body nearly circular, derm mem- 

 branous, antennae tiny with a single long seta, spiracles small, with- 

 out pores, margin of body with some setae and small tubular ducts 

 in clusters, pygidium somewhat chitinized, median lobes only well 

 developed, protruding, fused into a single lobe, marginal plates 

 present, grouped near the middle line, strongly branched, both dorsal 

 and ventral marginal setae present, relatively large and long, with 

 marginal incisions with thickened edges, no paraphyses, anal open- 

 ing medium in size, placed near the apex of pygidium, paragenitals 

 wanting, dorsal marginal pores present, some opening in incisions, 

 dorsal pores present, few in number, tubes short, axis transverse, 

 with ventral micropores with short tubes and with tiny ventral setae, 

 with basal thickenings; intermediate stage female similar to adult, 

 differing only in smaller size and numerical reduction of ducts and 



