220 



and the description aceonipanYiiig the name was enriiely insufficient to 



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

 connection with a full description, not with a viewuf enconr aging such 

 mode of pnblication. which is not sanctioned by the canons of nomen- 

 clature formulated and generally accepted, bnt as a mannscript name, 

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

 paratively immaterial. 



Our first acquaintance with the species was in June. 1S7S. when 

 we found it occurring in profase abundance on the leaves of the cimis 

 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. Hubbai\i. at Crescent 

 City, and the late Jos. Toyle, at Grainesville. The species was not 

 treated in Mr. Hubbard's report on the insects afiLecting 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. Hubbai^d's report was prepared the insect had not 

 become of especial economic imporrance. 



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

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

 leans. La., Baton Eouge. La.. Ealeigh. ils . C. and many Florida local- 

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

 parts of Louisiana and Florida as to deserve immediate attention. 



DESCRIPTI^^:. 



Aleyrodes ciTRin. sp. Ego (Fig. 236). — Lengdi, from 0.2^^ to 0.23^™; with a 

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

 proper and some^rhat knobbed at base. Width abont one-fonrth the length, -ni-dest 

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

 em^bryo are subsequently seen. Surface highly polished, with no sculpturing: color 

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

 the orange leaf: stem -rery pale brownish, darker at base. Surface frequently 

 appearing pruinose. 



Lahva. — Tint fia^e ^ Fig. 23 d. Length when nrst hatched about 0.3^--: color, 

 pale greenish-yellow, with two large irregular darker yellow spots on the dorstim 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 invis ible. Antennae 3- or 4-jointed ; basal 

 joint short and stout: joint 2 somewhat longer than joint 1 but narrower: joint 3 

 four times as long as joint 2 and about one-half as wide : joint 4 one-half as long as 3 

 and of equal ^dth. the articulation between 3 and 4 very difficult to define and 

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

 dat disc at tip. Eostrum apparently ex-articulate, the extensile portion reaching 

 beyond hind cox*. Anal orince 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 an irregular longitudinal greenish- 

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

 greenish -yellow sp>ot near anterior outer angle of prothorax : eyes small, more dis- 

 tinct than 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 



