172 [August, 



the 8ub-costa; the radius or main branch of the subcosta is very slightly convex, 

 and reaches the margin above the apex ; the secondary subcosta is also very slightly 

 convex, and throws off a very short reflex branch to the margin soon after its furca- 

 tion, thus forming a long, narrow and obscurely punctate pterostigraa ; the main 

 cubitus is convex, reaching the margin as far below the apex as the radius does 

 above it, and forks at half its length, throwing off a branch reaching the margin at 

 a distance equal to that between the main branch and the radius ; the secondary 

 cubitus forks at half its length, but the upper branch is very convex, and therefore 

 nearly twice as long as the lower ; the clavus is very slightly concave. The veins 

 just described form closed cells on the wing, in all of which, with the exception of 

 the anterior basal cell, the stigma and the claval cell, there are a number of dis- 

 connected patches formed of minute punctuation and shading ; four of these are 

 Y-shaped, with stalks starting inwards from the margin, the rest are irregular ; 

 these patches cover rather more than the outer half of the wing. The genitalia 

 consist of two conical valves or plates, broad at the base, with slightly convex sides 

 and sharp points ; between them the ovipositor slightly protrudes ; these valves are 

 very short, being scarcely longer than the penultimate abdominal segment. Both 

 valves bear many short fine hairs. 



S . The adult male resembles the female in size and colour, and in the venation 

 of the wings. The genitalia consist of the usual processes placed dorsally at the 

 extremity of the abdomen. Viewed sideways the genital plate is anteriorly cylin- 

 drical, and very broadly rounded posteriorly ; the forceps consists of two rather 

 narrow, somewhat pyriform processes with the tips turned backwards ; the penis is 

 subcylindrical. Yiewed from above the rounded posterior portion of the genital 

 plate is seen to consist of two lateral lobes, and the two processes of the forceps 

 curve inwards. The segment which bears these organs is about as long as, or a 

 little longer than, the two penultimates together. All the processes bear some short 

 spiny hairs. 



Pupa naked, active ; average length about ^V i"eh. Q-eneral colour buff, with 

 dark brown patches on the thorax and transverse narrow brown stripes on the 

 anterior abdominal region, the posterior region brown. Antennae long, slender, 

 brown, darkening to the tips. The posterior abdominal extremity is truncate and 

 not produced, and bears a few longish hairs. The anal ring is elongated, and as if 

 formed of two oblique, convex, conical divisions, with their bases conjoined and 

 their divergent tips pointed ; in consequence the posterior margin is straight, the 

 anterior deeply concave. 



Larva generally similar to the pupa, but smaller j the average length is 

 about -— inch. 



Habitat : in New Zealand, on Acacia melanoxylon at Wellington. 

 A tree of this species in a garden is every summer covered with great 

 numbers of the insects in all stages of growth. In winter an occa- 

 sional stray adult may sometimes be found, but rarely. The tree, 

 which is about 20 feet high, does not seem to have been as yet seriously 

 damaged, though it is not as vigorous as it should be ; it is, however, 

 also attacked by Aspidiotus camellice, Boisduval, and the Coccid will 

 probably be more injurious to it than the Psyllid. 



