THE ORANGE THRIPS. D 



Ahddincn ovoid, tip coiiiciil. all siiiiics. cxct'i'tiii^ a very few at 1i|i, inroii- 

 si»ieuoiis. 



Described from many female specinuMis collected from oraii.u'e folia^H' and 

 frulf at Exeter, Tulare County, Cal. 



The males are similar to the females, but smaller and more active, 

 with the orange-colored testes prominent. 



THE EGG. 



The ego- is a bluish white, bean-shaped object measuring from 0.2 

 mm. in length to about 0.075 mm. in width, with a very thin shell. 



THE LARVA. 



First-Stage /wrrfl.— Length 0.041 mm.; width of mesothorax 0.011 mm.; 

 general shape fusiform. The antennie, head, and legs are large and unwieldy 

 in proportion to the rest of the bctdy. Color translucent white. Anteniuc, length 

 0.015 mm. ; distinctly 4-segmented ; I short, cylindrical ; II more than twice as 

 long as I, slightly urn-shaped, longer than wide; III about as long as II, 

 obtusely fusiform; IV about as long as the other joints combined, fusiform, 

 very finely drawn out at the distal end. Segments II, III, IV (II very ob- 

 scurely) ringed, the distal rings on segment IV appearing as segmental 

 divisions. A few fine hairs present on all segments, most numerous on IV but 

 not very conspicuous on any of the segments. Head subquadrate ; eyes reddish- 

 brown. Abdomen gradually tapering, 10-segmented, first '^ segments subequal ; 

 IX and X large and more abruptly tapering, hairs inconspicuous. Legs stout, 

 femora and tibise nearly equal in length, tarsi one-jointed, ending in a shigle 

 claw. 



Second-stage larva. — Length 0.9 mm. ; head length 0.1 mm. ; width 0.0S3 mm. ; 

 length of antennae 0.175 nun. ; width of mesothorax 0.200 nun. : width of 

 abdomen 0.3 mm.; Antenna\ I, 2,u : II, 3ai ; III, 9/^; IV, 45m; V, 9m; VI, 15/x; 

 color orange-yellow. In shape similar to first-stage larva except that the 

 abdomen is oval to ovate and generally more robust. Head quadrate, small in 

 l-roportion to body, eyes reddish. Antennte apparently 4-segniented under 2/3 

 objective, but under 1/G objective distinctly G-segmented, the chitin not extend- 

 ing into the fifth and sixth segments; I short, conical, about as broad as long; 

 II cylindrical, broader than long and slightly longer than I; III obtusely 

 spindle-shaped, about twice as long as broad and about as long as I and II 

 combined ; IV obtusely spindle-shaped but blunt on the distal end, about as 

 long as III; V very short and thick, slightly broader than long, about one- 

 fifth as long as IV; VI cylindrical, longer than broad, about one-third as long 

 as IV. Abdomen oval to ovate. 10-segniented, the last segment tubular. Legs 

 short and stout, hind femora and tibiie about equal, hairs everywhere incon- 

 spicuous excejit a few under 1/G objective, which are the most prominent on 

 last segments of antennae. 



THE PUPA. 



First-stage pttija. — Length 0.56 mm.; width of head 0.1."i mm.; width of 

 mesothorax O.IS mm.: width of abdomen 0.25 nun.; antenn;e, length 0.2 mm. 

 Color pale translucent yellow; antenme, legs, and wing-pads lighter. Shape 

 similar to advanced first-stage larva ; abdomen elongate ovoid. Antenme pro- 

 jecting cephalad, 4-segmented; I short, thick, slightly wider than long; II ob- 

 tuse, urn-shaped, about as wide as long; III obtusely spool-shaped, about as 



78562°— Bull. 99. pt 1—11 2 



