594 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



from M. SigQoret. Professor Oomstock has also received this species 

 from Ithaca, N. Y., and from St. Louis, Mo., in each case occurring 

 upon willow. 



Scale of female. — The scale of the female is of the form characteristic of the genus, 

 being long, narrow at the anterior end, and broadly widened posteriorly. Exuviae 

 dark yellow, normally covered by a thin layer of white excretion ; this, however, is 

 easily removed. Scale, snowy white. Length, 3 to 4™™ (.13 inch) ; width near pos- 

 terior end, 1.6"^"" (.06 inch). 



Female. — The body of the female is reddish. The last segment differs from that 

 of C. ortholobis as follows: The median lobes are joined at the base, and are widely 

 separated at their distal extremities; between the first plate and the second lobe 

 and mesad of the third lobe are prolongations of the body wall, which extend caudad 

 as far as the lobes, and bear elongated pores. Immediately laterad of the third group 

 of plates is a prominent prolongation of the body bearing an elongated pore, while 

 in the case of C. ortholobis this is situated at one-third the distance from the third to 

 the fourth group of plates. In C. salicis the two lateral groups of plates often con- 

 sist of three instead of two, and the penultimate segment bears at least six plates ; 

 the antepenultimate three or four, and the one anterior to this, one or two. 



Scale of male. — The scale of the male is long, narrow, with the sides nearly paral- 

 lel. It is trifiarinated and snowy white, with the exuviae yellowish. (Comstock.) 



91. Chionaspis ortholobis Comstock. 



According to Professor Comstock (Ag. Rt., 1880), this scale insect 

 occurs on the willow at San Bernardino, Cal. It infests chiefly the 

 hark of the small whip-like limbs which spring from the trunks of the 

 trees. Many of these sprouts were dead and white with the scales of 

 this species. The eggs were observed September 12. 



Scale of female.— The scale of the female very closely resembles that of C. salicis ; 

 it is, however, smaller and narrower. Length, 2 to 2.5""^ (about .08 inch). 



Female.— The body of the female is dark purple. The last segment presents the 

 following characters: 



The anterior groups of spinnerets consist of from ten to sixteen ; the anterior lat- 

 erals of eighteen to thirty, and the posterior laterals of sixteen to twenty. 



The median lobes are almost contiguous ; their mesal margins are parallel for more 

 than half their length ; the distal margin of each is rounded. 



Each of the second and third lobes is deeply incised ; the lateral lobule in each 

 case is very small, often obsolete; the mesal lobule is large and rounded ; the distal 

 margins of all the lobes are distinctly crenate. 



The plates are as follows: One laterad of first lobe; one or two laterad of second 

 lobe; two laterad of third lobe, and two quite large ones quite near the penultimate 

 segment. The penultimate segment usually bears four and the antepenultimate one. 



The spines on the dorsal surface are as follows : The first on the base of the lateral 

 part of first lobe; the second and third on the lateral lobule of the second and third 

 lobes, respectively, and the fourth a short distance mesad of the lateral pair of plates. 

 On the ventrad surface there are also four on each side ; each spine is laterad of the 

 corresponding spine of the dorsal surface, and cephalad of the base of the corre- 

 sponding plate or group of plates. 



Eggs.— The eggs are dark purple. 



Scale of 7nale.— The scale of the male differs from all other specimens of this genus 

 known to me in not being carinated. It is an elongated oval in outline, being 

 slightly broadest at the middle, and tapering towards both ends almost equally. 

 The larval skin is light yellow ; the scale is snowy white. 



Described from thirteen males and many scales of each sex. (Comstock, Ag. Rt., 

 1880.) 



