162 THE UNIVERSITY SCIENCE BULLETIN. 



Shape. Imperfectly oval, flattened at the uppei' end, from which arise 

 two long thread-like processes, longer than the ovum, and thickened at 

 the base, diminishing in thickness toward- the apex. 



Markings. Surface of chorion thickly covered with irregularly cir- 

 cular pits, in the middle of which is a point. The processes appear 

 smooth. 



The writer has photographed an egg (see pi. VII), and adds the 

 following description of them: Length, 2.86 mm.; greatest width, .86 

 mm. Filaments, basal, amber-colored part 1.35 mm.; the larger, opaque 

 white part, 2.73 mm., the filament measuring a total of 4.1 mm. These 

 filaments are placed at the cephalic end of the egg as shown in the 

 drawing on plate XVIII. The filament is differentiated into two parts, a 

 basal amber-colored part, and an outer, larger opaque white part. The 

 basal part has a core of opaque white and a sheath of amber with the 

 diameter of the cylinder uniform. The outer part is larger than the 

 basal part, and tapers gradually to a point near the tip, where it again 

 enlarges slightly. The tip is acutely rounded. 



The surface of the egg is finely but irregularly hexagonally reticulate, 

 appearing punctate under low power. Surface is rough. Color is 

 cream, at first light, darkening with age. Micropylar spot near fila- 

 ments as shown in drawing. Clear, smooth and amber colored. The 

 central spot very dark. This spot can be seen to be reticulate under 

 certain lighting as can also the white part of the filaments. Here the 

 reticulation is very fine. 



First Instar. 



"Form in a general way resembles the adult. It is, however, broader 

 in proportion to length. The head, including the eyes, is broader than 

 long, excluding the rostrum. Each eye is less than one-third the width 

 of the head, round and projecting beyond the thoracic margins. The 

 thorax is a little under one-third the total length of the bug. It shows 

 the three rings. 



"The rostrum is four-jointed, stout, the first joint stoutest, about 

 twice as long as the second, and subequal to the third and fourth. The 

 fourth or terminal joint is furnished with tactile hairs, as in the adult, 

 the antennae are short, club-shaped, one-jointed, the extremity nearly as 

 broad as the length, situated near the basal joint of the rostrum. The 

 thorax is a little under one-third the total length of the bug, and shows 

 the three rings. The bifid air-tube is absent, its place being taken by 

 the blunt extension of the terminal abdominal segment, as described in 

 connection with the respiratory system. The legs are comparatively 

 stout, the second and third pairs being nearly as long as the entire bug. 

 The tarsi of the first pair are one-jointed and entirely destitute of claws; 

 those of the second and third pair are also one-jointed, armed with long 

 claws. The tibiae of these two pairs are armed with a comb-like row of 

 stout spines going partly around at the distal end, at the tarsal joint, 

 and are furnished with a few coarse hairs at this end also. The first 

 pair of pedes is the counterpart of those of the adult, except that they 

 are much broader in proportion, and do not show the blunt, so-called 

 apical tooth in the femur. 



"Size: Long., 8 mm.; lat., 1 mm. at thorax; air-tube long., 1.5 mm. 



"Color: Brownish of varying shades, including the legs, which are 

 banded with lighter rings. The eyes are black or dark brown. 



"Markings: None sufficiently definite to be called such. There is 

 a lighter median line in the thorax." 



