302 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



They each appear to consist of a simple convex cornea projecting be- 

 yond the margin which is liere slightly emarginate. They are rendered 

 very prominent by a collection of reddish or reddish black pigment gran- 

 ules more or less closely connected with the cornea, and which appear to 

 form the termination of the optic nerve. ^ 



The antennre, fig. 2ob, arise from slight tubercles on the front, slightly 

 in the rear of a line connecting the eyes and at a distance from the mar- 

 gin equal to about one-third of the width of the head. They are quite 

 jagged in outline, tapering gradually towards the end, and furnislied 

 with an apparently definite number of long slender spiny hairs. The 

 separations of the joints are more or less indistinct, so that it is difficult 

 to ascertain the exact number. Signoret gives six as the maximum 

 number of joints in the larva of Pulvinaria. In tliis case the joints 

 marlied 5 and 6 in my figure would be considered as but one joint. As 

 the insect approaches maturity the joints become more distinctly sepa- 

 rated, and in the adult female one can always make out seven or eight 

 without difficulty, and it seems to me quite probable that this is really 

 the correct number for the larva as well. 



Considering the antenna as composed of seven joints as represented in 

 the figure, the terminal joint is the longest, the third next, and the fourth, 

 fifth and sixth progressively shorter. (If there are but six joints the 

 fifth is equal to, or a little longer than the fourth, and if there are eight 

 joints the seventh is shorter than the sixth, and the eighth shorter than 

 the third.) The first and second joints are each of regular outline and 

 bear two slender spiny hairs; the tkircl joint of slightly jagged outline, 

 bears two very long, rather stout hairs inserted about two-thirds of tlie 

 distance from the base; the /oMr^/i joint, of quite jagged outline, bears 

 usually one slender hair ; the fifth joint, jagged bears one short and one 

 rather long hair inserted near its extremity; the sixth joint, about the 

 same length as the fifth, but more jagged, appears to be without hairs ; 

 the seventh or terminal joint has its greatest diameter nearly midway 

 between its base and its center, thence decreases in four irregular jagged 

 steps to the apex, and is furnished with eight or ten prominent hairs, 

 having their insertions in the jagged incisions, several of which are very 

 long, sometimes that arising from the extremity, and sometimes one from 

 the side is the longest and most prominent. The first joint is about 

 twice as thick as long. The long hair on the second joint is longer than 

 any of those on the ultimate. The second to sixth joints are of nearly 

 uniform diameter, gradually, and not very regularly, decreasing from 

 12 /^ to 10 /^. The entire length of the antenna from the base to the tip 

 of the ultimate joint is about 130 /'■ and to the tip of the terminal hair, 

 215 /i. On the front between the bases of the antennae, are two small 

 spines directed backwards. 



The chitinom frame work supporting the buccal sette does not differ 

 except in the size and strength of the parts from that of the adult female, 

 which will be fully described hereafter. Fig. 2'ja represents this frame- 



* Miss Smith in Ith Report of Entomologist of Illinois, p. 135, says that the eyes arc com- 

 pound, but I thiuli that this must be an error. 



