220 



aud the description accompanying the name was entirely insufficient to 

 enable recognition aside from the food-plant. We adopt the name in 

 connection with a fall description, not with a view of encouraging such 

 mode of publication, which is not sanctioned by the canons of nomen- 

 clature fornmlated and generally accepted, but as a manuscript name, 

 satisfactory in itself, the authority to be recognized for it being com- 

 paratively immaterial. 



Our first ac(iuaintance with the species Avas in June, 1878, when 

 we found it occurring in profuse abundance on the leaves of the citrus 

 trees in the orangery of this Department. Some observations were 

 made upon its life-history during that summer, and all of its stages were 

 observed. During the following years we observed it in Florida and 

 it was studied by two of our agents, Mr. H. G. Hubbard, at Crescent 

 City, and the late Jos. Voyle, at Gainesville. The species was not 

 treated in Mr. Hubbard's report on the insects affecting the Orange, as 

 we wished to give it a fuller consideration than could then have been, 

 given, and other duties prevented doing so in time. Moreover, at the 

 time when Mr. Hubbard's rep<n't was prepared the insect had not 

 become of especial economic importance. 



Since that time many further notes have been made in Washington, 

 and we have received the species from Pass Christian, Miss., Xew Or- 

 leans, La., Baton Rouge, La., Raleigh, IS". C, aud many Florida local- 

 ities, and during the past year or two it has become so multiplied in 

 parts of Louisiana aud Florida as to deserve immediate attention, 



DESCKIPTIVK. 



Aleyrodes citri n. sp. Egg (Fig. 236). — Length, from 0.2""" to 0.23'""'; with a 

 comparatively slender petiole or foot-stalk about one-third the length of the egg 

 proper and somewhat knobbed at base. Width about one-fourth the length, widest 

 portion somewhat beyond the middle or at about the point where the eyes of the 

 embryo are subsequently seen. Surface highly polished, with no sciilpturing ; color 

 pale yellow with a faint greenish tinge, somewhat darker than the under surface of 

 the orange leaf; stem very pale brownish, darker at base. Surface frequently 

 appearing pruinose. 



Larva. — First stage {Fig. 23 d). Length when lirst hatched about 0.3"""; color, 

 pale greenish-yellow, with two large irregular darker yellow sjiots on the dorsum of 

 the abdomen ; all four eyes purplish-red ; shape regularly elliptical ; margin of body 

 with 38 minute tubercles, each bearing a bristle of which 4 anal and 6 cephalic are 

 specially long ; abdominal segments well separated and especially visible ventrally ; 

 cephalo-thoracic and thoracic articulations invisible. Antenuit 3- or 4-jointed ; basal 

 joint short and stout; joint 2 somewhat longer than joint 1 but narrower; joints 

 four times as long as joint 2 aud about one-half as wide ; joint 4 one-half as long as 3 

 and of equal width, the articulation between 3 aud 4 very difficult to define and 

 frequently invisible. Legs very short and stout ; tarsi with three crotchets and a 

 flat disc at tip. Rostrum apparently ex-articulate, the extensile portion reaching 

 beyond hind coxie. Anal orifice semicircular in shape and bounded posteriorly by 

 a slight chitinous thickening of the integument. Second stage. Broadly ovate, flat; 

 color immediately after the molt almost white with au irregular longitudinal greenish- 

 yellow spot on side of dorsal line, covering joints 4 to 7 of the abdomen, and a faint 

 greenish-yellow spot near anterior outer angle of prothorax; eyes small, more dis- 

 tinct thau in first stage, purplish in color. Entire dorsum densely rugose ; tubercles 

 of the margin absent except two on head and four at the anal end of the body. A. 



