March, I90I.1 CaUDELL : I HE (jENUS SiNEA OF A.UiXrr &^ S-^J^ I'/LLE. 5 



This is our most common and best known species and is readily 

 separable from all others, except coronata, undiilaia and confi/sa, by 

 the distinctly undulated margins of the female abdomen. The spined 

 anterior prothoracic lobe clearly separates it from corona/a but from 

 confusa it can be distinguished only by comparative differences, aided 

 perhaps in some cases by the habitat. It differs from iiiidulata only 

 in minute details. 



The figure of this species on the plate shows an average female 

 specimen, the undulations of the abdomen probably being a little too 

 much rounded. In a female specimen in the collection of the 

 National Museum that is doubtfully referred to this species the pos- 

 terior prothoracic lobe is not bigibbous on the disk and the margins 

 of the abdomen are not at all undulate, though the edges show semi- 

 transparent at intervals, giving them a distinctly undulated appearance. 



The egg and first stage of the nymph of this species were described 

 by Mr. W. H. Ashmead in Insect Life (Vol. VII, p. 321, 1895). As 

 this, so far as I know, is the only description of immature forms of any 

 of our Sineas the matter is here reproduced in full. 



" Ova, Length, 1. 5 mm. or a little more than twice as long as thick, "of a cylindri- 

 cal shape, rounded at bottom and truncate at top. The top is surmounted by a broad, 

 silky, white, marginal fringe, in the center of which is a cone-shaped cap or lid, which 

 is removed when the young nymph makes its exit from the egg." 



♦' A freshly laid cluster of these eggs, deposited Aug. 7th, hatched 

 on the 17th, so that the duration of the Q'gg state, under ordinary 

 circumstances, can not be more than ten or twelve days. The eggs 

 are deposited in clusters to the number of eight, ten, or more, on 

 either the upper or lower surface of the (cotton) leaf, and are closely 

 together in a sticky, dark honey-yellow, or reddish-yellow secretion." 



" Nymph, first stage. Length 1.8 mm., and of a piceous or shiny black color ; 

 the antennae, except at extreme base, the apical half of middle and posterior tibia and 

 all tarsi being brownish yellow, while the middle and hind legs, except as already noted, 

 are dark, piceous. The antennae are cylindrical, 4-jointed, as long as the body, the 

 first and last joints being nearly equal in length, while the second and third united are 

 a little shorter than the first ; the head is large, oblong and smooth, widest anteriorly, 

 and as long as the thorax, the beak is stout, extending to between the middle coxje ; 

 the thorax is divided into two lobes, each of which bears a pair of spines ; abdomen 

 short and not longer than the hind lobe of the thorax ; the anterior femora are longer 

 and much stouter than the others and armed with strong spines above and beneath, 

 their tibiae shorter and slenderer, pilose and with three spines beneath ; while the 

 middle and hind legs are shorter and more slender, without spines although more or 

 less pilose." 



