4 INSECTS INJURIOUS TO SUBTROPICAL FRUITS. 



DESCBIPTION AND LIFE HISTORY. 

 THE ADULT. 



The adult female of the orange thrips is a small, four-wmged, 

 orange -yellow insect, Avhich moves very rapidly by running, leaping, 

 and flying. The mouthparts, which are suctorial in nature, form a 

 sharp cone projecting from the underside of the head. The adult 

 male is smaller than the female and much more rapid in its 

 movements. 



The original description of the adult female by Moulton * is as 



follows : 



Euthrips citri n. si). 



Measurements : Head, length 0.75 mm., width 0.15 mm. ; prothorax, length 0.09 

 mm., width 0.18 mm. ; mesothorax, width 0.24 mm. ; abdomen, width 0.25 mm. ; 

 total body length 0.8G mm. Antenna? : I, 12/,t ; II, 36^ : III, 39^ ; IV, SQ/x ; X. 30^ ; 

 VI, 34m-; VII, 6m; VIII, 12fi; total, 0.205 mm. Color, yellow to orange-brown, 

 with thorax and segment 2 of antennae more noticeably orange-brown. 



Head twice as wide as long, retracted considerably into the prothorax, 

 broadly rounded in front, with only slight depressions to receive the basal 

 joints of the antenna?; two spines on anterior margin, other spines not conspic- 

 uous; cheeks almost straight and parallel. Eyes large, occupying almost one- 

 half the length of the head, prominent ; pigment deep red to purple ; facets of 

 eyes large, eyes pilose. Ocelli subapproximate, margined inwardlj' with yel- 

 low-brown crescents. Mouth-cone short, reaching almost to posterior margin 

 of prothorax, broadly rounded and with black spot at tip; maxillary palpi 

 3-segmented. Anteiuuc 8-segmented, with segment 2 orange-yellow, other seg- 

 ments uniformly light brown; segments 2, 4, 5, and G almost equal in length; 

 style about one-half the length of segment 6. All spines inconspicuous; sense 

 cones transparent. 



Prothorax about twice as wide as long, posterior angles broadly rounded; 

 with long brown and outer small spine at each posterior angle, other spines not 

 conspicuous. Mesothorax largest and with anterior angles broadly rounded. 

 Legs light yellow-brown, with tarsi lighter but dark brown at the tip; spines 

 on legs brown. Wings present and fully developed, forewings broadest near 

 base and pointed at tips; with the ring vein and a single longitudinal vein 

 which divides at about one-third the length of the wing from the base, the 

 anterior part running parallel and approximate to the anterior part of the ring 

 vein, and ending abruptly near the tip, the posterior paralleling and approach- 

 ing the posterior part of the ring vein and ending about one-half the wing's 

 length from the end, each branch with a dark-brown marking immediately at 

 its tip. The costa bears a row of about 29 regularly placed spines. Other 

 spines placed as follows : A group of 5 near base of median longitudinal vein ; 2 

 on either side of where second vein branches from the first, and 3 scattered 

 spines about equidistant on each branch vein and in each case one of these 

 spines immediately at the end of the vein ; several rather long spines on scale. 

 Veins of the forewing unusually strong and conspicuous, somewhat orange 

 colored near base but fading to yellow near tip. Meuil)r:ine of wings trans- 

 parent. 



" Loc. cit. 



