Aphidulae of Formosa. — 3. 65 



Callipterus kahawaluokalani (Kirk.) 

 Aphidichc of Formosa-1, p. 74 (1921 ; Aphididac of rormosa-2, p. 44 and 

 125 (1923). 



Nymph of viviparous female. 

 Key to instars. 

 ( 1 ) Antennae 4-jointcd; one pair of hairs on the front of tlie head scarcely or not 

 at all capitate The 1st instar. 



Antennae 5 or 6-jointcd; all the liairs on the head capitate (2) 



( 2 ) Wing-pads lacking; antennae 5-jointed; eyes almost witliout 



ocular tubercles The 2nd instar. 



Wing-pads present; antennae 6-jointed; eyes with very small 



ocular tubercles (3) 



( 3 ) Wing-pads not well developed; the 4th or 5th antennal joint 



almost as long as the base of the 6th The 3rd instar. 



Wing-pads well developed; the 4th or 5th antennal joint a little longer 



than the base of the 6th The 4th instar. 



(Tlic first instar) Pale yellow. Eyes red. Antennae pale yellowish, with 

 the 4th joint very slightly dusky. Legs pale yellowish. Cornicles, cauda and hairs 

 pale yellowish. Body almost twice as long as wide. Head large, Mith a pair of 

 bristles on the front that are scarcely or not at all capitate; 2 pairs of long capitate 

 hairs between the antennae and 4 similar hairs arranged in a transverse row in 

 front of the eyes. These capitate hairs almost as long as the 1st antennal joint and 

 each arising from a very small tubercle. Frontal tubercles lacking. Eyes not protu- 

 berant, without ocular tubercles. Antennae 4-jointed, more slender than the tibia, 

 about half as long as the body; the basal two joints each provided with a very short 

 capitate hair; the 3rd longer than the basal two joints taken together, almost 

 without hairs; the 4tii with a few short setae at the tip; the relative length of joints 

 about as follows: III-24, IV-22 (11 + 11). Rostrum stout, reaching the middle 

 coxae. Pronotum provided with a pair of long capitate hairs at the middle, each 

 arising from a very small tubercle and 4 similar hairs arranged in a transverse 

 row. Meso-and metathoraces and the first four abdominal segments each with 4 

 similar capitate hairs arranged in a transverse row on the dorsum. The 5th, 6th, 

 7th, and 8th abdominal segments each with a pair of capitate hairs on the dorsum; 

 the 9th with a pair of non-capitate bristles on the lower side. The hairs on the 

 body subequal in lengtli. Cornicles somewhat protruding, much shorter than wide. 



