COCCIDAE OF OHIO. 51 
Grove, Fairfield Co., Newark, Licking Co., Somerset, Perry Co., 
Quaker City, Guernsey Co. 
Howardia biclavis (Comst. ) 
Fig. 39. 
Chionaspis (?) biclavis Comst., 2nd Rep. Dep. Ent. Corn. Univ., 
p. $8 (1883). 
Howardia biclavis Berl. e Leon., Riv. Pat. Veg., iv, p. 348 (1896). 
Scale of female: Circular, convex, 2mm. broad, white, variously 
colored by epidermis of host plant under which it mines. Exuviae 
marginal, the first projecting beyond the margin of the scale. 
Female: Median lobes large, broader than long, approximate at 
base, somewhat pointed, lateral margins serrate, mesal margins diverg- 
ing; second lobe small, pointed, simply a projection of the segment; 
third lobe rudimentary, low serrate; fourth lobe broad, low, incised 
forming two pointed serrate lobules. Plates simple, spine-like, in- 
creasing in size from the meson; two small ones between median lobes, 
two between first and second, usually three between second and third, 
four or five between third and fourth lobes, and laterad of fourth lobes 
six or seven larger plates. Spines accompany each group of plates 
on both dorsal and ventral surfaces. Dorsal pores rother numerous, 
very small, in three interrupted rows. Circumgenital gland-orifices 
wanting. On the ventral surface accompanying each group of plates, 
is a group of very small spines. Extending anteriorly within the 
body wall, from the median lobes, are two long, ciub-shaped, chitinous 
thickenings, which are characteristic of this species. Anal orifice 
situated far anteriorly, just anterior of the genital orifice. 
Remarks: This Coecid was found badly infesting Hibiscus 
aculeatus in the Ohio State Universty Conservatory. It has a 
pecuhar habit of mining under the epidermis of the host plant 
and maturing there. 
Diaspis boisduvali (Signoret ). 
Fig. 42. 
Diaspis boisduvalii Sign., Aun. Soc. Ent. Fr., (4), ix, p. 452 (1869). ° 
Diaspis boisduvalii Comst., 2nd Rep. Dep. Ent. Corn. Univ. p. 86 
(1883). 
Scale of female: 2mm. diam., circular, sometimes a little elon- 
gated, white or light-gray. Very large exuviae slightly darker in color, 
nearly central. 
Scale of male: White, strongly tri-carinated, usually massed in 
Jarge numbers and covered with white, wooly hairs. 
Female: Cephalo-lateral angle of body is prolonged into a small 
projection. Median lobes are large, wing-shaped, divergent, separated 
at base, serrate on mesal margins, and attached for entire length of 
