AiiT. 12. MASKELL GENERA OF COCCIDAE MORRISON. 105 



beyond the third lobes, and still another, smaller, near the base of 

 pygidium, ventrally with those between the median lobes, already 

 mentioned, a small one beneath the first dorsal pair, and similar ones, 

 all small, corresponding to the remaining dorsal setae; with a sub- 

 marginal ventral row of smaller setae, each anterior to a marginal 

 seta, except the first, and each accompanied by a micropore ; without 

 incisions with thickened edges, but with the openings of the marginal 

 pores set in slightly, the rim chitinized and with a rather prominent 

 lobelike marginal projection below each, these pores one inside sec- 

 ond lobe, one inside third lobe, two between third and fourth gland 

 spine groups and three near base of pygidium ; anal opening of me- 

 dium size, circular, close to base of pygidium; paragenitals present, 

 in five groups, median 6-7, anterio-laterals 13-17, posterio-laterals 

 19-23 (one group with 10), these averages from four specimens; 

 dorsal pores present, in fairly distinct rows, the pores set rather close 

 together, inner row posterior group 1-3, anterior 2, second row, pos- 

 terior group variable, 3-5, anterior 3-5, then with supplementary 

 posterior row of two, third row, posterior group about four, anterior 

 about four; without internal pygidial thickenings; with two pairs 

 of tiny setae dorsally near anal opening and similar setae ventrally 

 near the genital opening. 



Intermediate stage female. — (exuvium only) apparently resembling 

 the adult female, differing chiefly in the reduced development of the 

 various pygidial structures and in the gland spines being single and 

 isolated. 



Larva. — Oval, antennae slender, 5-segmented ; legs slender, normal, 

 the claw long, very slender, curved; anterior apex of body with a 

 pair of large and long slender tubular ducts; the tiny circular anal 

 ring near body apex; apex of abdomen with long and short setae, 

 one pair of lobes, marginal ducts and two pairs of gland spines. 



C'otype.—Q,2Lt. No. 24778, U. S. N. M. 



The following generic description is based on the preceding de- 

 scription. 



GENERIC DIAGNOSIS OF TRICHOMYTILUS. 



Diaspine forms, with female scale elongate, mytilaspiform, exuviae 

 terminal, body of adult female similar, antennae cylindrical invagi- 

 nated tubercles with setae, spiracles slender, with or without pores, 

 margin of cephalothorax and abdominal segments with tubular 

 ducts, gland spines and small setae, in rather definite arrangement, 

 pygidium rounded, with well developed entire lobes, large and long 

 double gland spines, normal dorsal and ventral setae at margin, no 

 incisions with thickened edges, no paraphyses, anal opening fairly 

 large, near base of pygidium, paragenitals present, in five groups, 

 marginal pores present, dorsal pores present, in fairly distinct rows, 

 3136— 22— Proc.N.M. Vol .60 V^^ 



